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<div class="WordSection1">
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><a name="_Hlk122600425"><span style="font-family:"Calibri",sans-serif">Good afternoon,</span></a><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif;mso-ligatures:none"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif"> <o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif">The SOC Services team is reporting on the vulnerability:</span></span><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif;mso-ligatures:none">
<b>CVE-2023-27351 PaperCut NG/MF Improper Authentication Vulnerability</b>. Due to its high visibility, we are providing this in-depth information.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif"> <o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><b><u><span style="font-family:"Calibri",sans-serif">History</span></u></b></span><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif">: On March 8, 2023, PaperCut
publicly acknowledged an authentication bypass vulnerability found in the SecurityRequestFilter class of PaperCut MF and NG. The vulnerability is currently assigned a CVSSv3 score of 7.5 (High) by NVD.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif;background:yellow;mso-highlight:yellow"><o:p> </o:p></span></span></p>
<table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" style="border-collapse:collapse">
<tbody>
<tr>
<td width="208" valign="top" style="width:155.8pt;border:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><b><span style="font-family:"Calibri",sans-serif">Major Version<o:p></o:p></span></b></span></p>
</td>
<span style="mso-bookmark:_Hlk122600425"></span>
<td width="208" valign="top" style="width:155.85pt;border:solid windowtext 1.0pt;border-left:none;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><b><span style="font-family:"Calibri",sans-serif">Affected Version Range<o:p></o:p></span></b></span></p>
</td>
<span style="mso-bookmark:_Hlk122600425"></span>
<td width="244" valign="top" style="width:182.95pt;border:solid windowtext 1.0pt;border-left:none;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><b><span style="font-family:"Calibri",sans-serif">Fixed Version<o:p></o:p></span></b></span></p>
</td>
<span style="mso-bookmark:_Hlk122600425"></span>
</tr>
<tr>
<td width="208" valign="top" style="width:155.8pt;border:solid windowtext 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif">PaperCut 22.x<o:p></o:p></span></span></p>
</td>
<span style="mso-bookmark:_Hlk122600425"></span>
<td width="208" valign="top" style="width:155.85pt;border-top:none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif">22.0.0 to 22.0.8<o:p></o:p></span></span></p>
</td>
<span style="mso-bookmark:_Hlk122600425"></span>
<td width="244" valign="top" style="width:182.95pt;border-top:none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif">22.0.9 and later<o:p></o:p></span></span></p>
</td>
<span style="mso-bookmark:_Hlk122600425"></span>
</tr>
<tr>
<td width="208" valign="top" style="width:155.8pt;border:solid windowtext 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif">PaperCut 21.x<o:p></o:p></span></span></p>
</td>
<span style="mso-bookmark:_Hlk122600425"></span>
<td width="208" valign="top" style="width:155.85pt;border-top:none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif">21.0.0 to 21.2.10<o:p></o:p></span></span></p>
</td>
<span style="mso-bookmark:_Hlk122600425"></span>
<td width="244" valign="top" style="width:182.95pt;border-top:none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif">21.2.11 and later<o:p></o:p></span></span></p>
</td>
<span style="mso-bookmark:_Hlk122600425"></span>
</tr>
<tr>
<td width="208" valign="top" style="width:155.8pt;border:solid windowtext 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif">PaperCut 20.x<o:p></o:p></span></span></p>
</td>
<span style="mso-bookmark:_Hlk122600425"></span>
<td width="208" valign="top" style="width:155.85pt;border-top:none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif">20.0.0 to 20.1.6<o:p></o:p></span></span></p>
</td>
<span style="mso-bookmark:_Hlk122600425"></span>
<td width="244" valign="top" style="width:182.95pt;border-top:none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif">20.1.7 and later<o:p></o:p></span></span></p>
</td>
<span style="mso-bookmark:_Hlk122600425"></span>
</tr>
<tr>
<td width="208" valign="top" style="width:155.8pt;border:solid windowtext 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif">PaperCut 19.x and older<o:p></o:p></span></span></p>
</td>
<span style="mso-bookmark:_Hlk122600425"></span>
<td width="208" valign="top" style="width:155.85pt;border-top:none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif">15.0.0 to 19.2.6<o:p></o:p></span></span></p>
</td>
<span style="mso-bookmark:_Hlk122600425"></span>
<td width="244" valign="top" style="width:182.95pt;border-top:none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif">End of Life (Upgrade to 20.1.7+)<o:p></o:p></span></span></p>
</td>
<span style="mso-bookmark:_Hlk122600425"></span>
</tr>
</tbody>
</table>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif;background:yellow;mso-highlight:yellow"><o:p> </o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif">For more information on this vulnerability, see the following links:
<o:p></o:p></span></span></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo3"><span style="mso-bookmark:_Hlk122600425"></span><a href="https://www.papercut.com/kb/Main/PO-1216-and-PO-1219"><span style="mso-bookmark:_Hlk122600425">https://www.papercut.com/kb/Main/PO-1216-and-PO-1219</span><span style="mso-bookmark:_Hlk122600425"></span></a><span style="mso-bookmark:_Hlk122600425">
<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo3"><span style="mso-bookmark:_Hlk122600425"></span><a href="https://www.zerodayinitiative.com/advisories/ZDI-23-232/"><span style="mso-bookmark:_Hlk122600425">https://www.zerodayinitiative.com/advisories/ZDI-23-232/</span><span style="mso-bookmark:_Hlk122600425"></span></a><span style="mso-bookmark:_Hlk122600425"><o:p></o:p></span></li></ul>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif;background:yellow;mso-highlight:yellow"><o:p> </o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><b><u><span style="font-family:"Calibri",sans-serif">Intelligence</span></u></b></span><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif">: As of April 20, 2026,
CISA has confirmed the vulnerability as being exploited in the wild and has added the vulnerability to the Known Exploited Vulnerabilities Catalog.
<o:p></o:p></span></span></p>
<p><span style="mso-bookmark:_Hlk122600425"><strong><span lang="EN" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">Exploitability:</span></strong></span><span style="mso-bookmark:_Hlk122600425"><span lang="EN" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">
</span></span><span style="mso-bookmark:_Hlk122600425"><span lang="EN" style="font-size:11.0pt;font-family:"Calibri",sans-serif">N<span style="color:black">etwork exploitability<br>
<strong><span style="font-family:"Calibri",sans-serif">Complexity:</span></strong> Low<br>
<strong><span style="font-family:"Calibri",sans-serif">User Interaction:</span></strong> None<br>
<strong><span style="font-family:"Calibri",sans-serif">Remotely Exploitable:</span></strong>
</span></span></span><span style="mso-bookmark:_Hlk122600425"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">Yes (Primarily via the Web Management Interface/Application Server).</span></span><span style="mso-bookmark:_Hlk122600425"><span lang="EN" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"><br>
<strong><span style="font-family:"Calibri",sans-serif">Proof of Concept:</span></strong> Yes<br>
<strong><span style="font-family:"Calibri",sans-serif">Zero Day:</span></strong> Yes
</span></span><span style="mso-bookmark:_Hlk122600425"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">(Confirmed exploitation occurred prior to public awareness/patching for legacy systems)</span></span><span style="mso-bookmark:_Hlk122600425"><span lang="EN" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><b><u><span style="font-family:"Calibri",sans-serif">Workarounds:</span></u></b></span><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif"> There are no workarounds.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><b><u><span style="font-family:"Calibri",sans-serif;background:yellow;mso-highlight:yellow"><o:p><span style="text-decoration:none"> </span></o:p></span></u></b></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><b><u><span style="font-family:"Calibri",sans-serif">How it works</span></u></b></span><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif">: The flaw exists within
the SecurityRequestFilter class. The issue results from improper implementation of the authentication algorithm. An attacker can leverage this vulnerability to bypass authentication on the system.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><b><u><span style="font-family:"Calibri",sans-serif">Post-Exploit</span></u></b></span><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif">: Upon successful exploitation
of the vulnerability, typically results in an unauthenticated "Information Disclosure" or a complete "Authentication Bypass. Because this vulnerability is almost always paired with its sister flaw (CVE-2023-27350), the "end-state" for an attacker is often
full administrative control.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif;background:yellow;mso-highlight:yellow"><o:p> </o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif">Tenable Plugins:<o:p></o:p></span></span></p>
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<p class="MsoNormal" align="center" style="text-align:center"><span style="mso-bookmark:_Hlk122600425"><b><u><span style="font-family:"Calibri",sans-serif">Plugin<o:p></o:p></span></u></b></span></p>
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<p class="MsoNormal" align="center" style="text-align:center"><span style="mso-bookmark:_Hlk122600425"><b><u><span style="font-family:"Calibri",sans-serif">Title<o:p></o:p></span></u></b></span></p>
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<p class="MsoNormal" align="center" style="text-align:center"><span style="mso-bookmark:_Hlk122600425"><b><u><span style="font-family:"Calibri",sans-serif">Severity<o:p></o:p></span></u></b></span></p>
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<p class="MsoNormal" align="center" style="text-align:center"><span style="mso-bookmark:_Hlk122600425"><b><u><span style="font-family:"Calibri",sans-serif">Platform<o:p></o:p></span></u></b></span></p>
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<p class="MsoNormal" align="center" style="text-align:center"><span style="mso-bookmark:_Hlk122600425"></span><a href="https://www.tenable.com/plugins/nessus/175674"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif">175674</span></span><span style="mso-bookmark:_Hlk122600425"></span></a><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif"><o:p></o:p></span></span></p>
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<p class="MsoNormal" align="center" style="text-align:center"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif">PaperCut NG SecurityRequestFilter Authentication Bypass (CVE-2023-27351)<o:p></o:p></span></span></p>
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<p class="MsoNormal" align="center" style="text-align:center"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif">High<o:p></o:p></span></span></p>
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<td width="162" valign="top" style="width:121.5pt;border-top:none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:0in 0in 0in 0in">
<p class="MsoNormal" align="center" style="text-align:center"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif">Nessus<o:p></o:p></span></span></p>
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<p class="MsoNormal" align="center" style="text-align:center"><span style="mso-bookmark:_Hlk122600425"></span><a href="https://www.tenable.com/plugins/nessus/176401"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif">176401</span></span><span style="mso-bookmark:_Hlk122600425"></span></a><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif"><o:p></o:p></span></span></p>
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<td width="672" valign="top" style="width:7.0in;border-top:none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoNormal" align="center" style="text-align:center"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif">PaperCut MF SecurityRequestFilter Authentication Bypass (CVE-2023-27351)<o:p></o:p></span></span></p>
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<p class="MsoNormal" align="center" style="text-align:center"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif">High<o:p></o:p></span></span></p>
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<p class="MsoNormal" align="center" style="text-align:center"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif">Nessus<o:p></o:p></span></span></p>
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<p class="MsoNormal" style="text-align:justify"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif;background:yellow;mso-highlight:yellow"><o:p> </o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><b><u><span style="font-family:"Calibri",sans-serif">Recommended Actions</span></u></b></span><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif">:<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><b><span style="font-family:"Calibri",sans-serif">Date Added</span></b></span><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif">: 2026-04-20<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><b><span style="font-family:"Calibri",sans-serif">Due Date</span></b></span><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif">: 2026-05-<span style="color:black">0</span>4<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif"> <o:p></o:p></span></span></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l3 level1 lfo6"><span style="mso-bookmark:_Hlk122600425"><span style="mso-ligatures:none">Deploy WAF rules to filter for malicious request patterns.<o:p></o:p></span></span></li><li class="MsoNormal" style="mso-list:l3 level1 lfo6"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif">Block inbound traffic to TCP ports 9191 and 9192.<o:p></o:p></span></span></li><li class="MsoNormal" style="mso-list:l3 level1 lfo6"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif">Verify host has not been compromised before applying patches.<o:p></o:p></span></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l3 level1 lfo6"><span style="mso-bookmark:_Hlk122600425">Apply appropriate updates provided by vendor to vulnerable systems immediately after appropriate testing.<o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l3 level1 lfo6"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif">Run all software as a non-privileged user (one without administrative privileges) to diminish the effects of a successful
attack.<o:p></o:p></span></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l3 level1 lfo6"><span style="mso-bookmark:_Hlk122600425">Apply the Principle of Least Privilege to all systems and services.<o:p></o:p></span></li></ul>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></span></p>
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<p class="MsoNormal"><b><span style="mso-ligatures:none">EIS Security Operations Center</span></b><span style="font-size:12.0pt;mso-ligatures:none"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-ligatures:none">Enterprise Information Services</span><span style="font-size:12.0pt;mso-ligatures:none"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-ligatures:none">Cyber Security Services | CSS</span><span style="font-size:12.0pt;mso-ligatures:none"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;mso-ligatures:none">SOC Hotline: (503) 378-5930</span><span style="font-size:12.0pt;mso-ligatures:none"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;mso-ligatures:none"><a href="mailto:SOC@EIS.OREGON.GOV">SOC@EIS.OREGON.GOV</a></span><span style="font-size:12.0pt;mso-ligatures:none"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-ligatures:none"><img border="0" width="54" height="54" style="width:.5625in;height:.5625in" id="Picture_x0020_2" src="cid:image005.png@01DCD0D4.D5418F80"></span><span style="mso-ligatures:none"> <img border="0" width="205" height="53" style="width:2.1354in;height:.552in" id="Picture_x0020_1" src="cid:image004.png@01DCD0D4.D5418F80"></span><span style="font-size:12.0pt;mso-ligatures:none"><o:p></o:p></span></p>
<p class="MsoListParagraph"><span style="font-size:12.0pt;font-family:"Aptos",sans-serif;mso-ligatures:none"> </span><span style="font-size:12.0pt;font-family:"Aptos",sans-serif"><o:p></o:p></span></p>
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