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<div class="WordSection1">
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">Good afternoon,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">The SOC Services team is reporting on the vulnerability:
<b>CVE-2025-68645 affecting Zimbra Collaboration Suite (ZCS)</b>. Because this vulnerability allows for unauthenticated remote file access and has seen significant interest in the security community due to its ease of exploitation, we are providing this in-depth
information. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><u><span style="font-family:"Calibri",sans-serif">History</span></u></b><b><span style="font-family:"Calibri",sans-serif">:</span></b><span style="font-family:"Calibri",sans-serif"> Disclosed on December 22, 2025, this vulnerability
was identified in the RestFilter servlet of the Zimbra Webmail Classic UI. The CVSS v3.1 base score is 8.8 (High)<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white">
<b><span style="font-family:"Calibri",sans-serif;color:black;mso-ligatures:none">Affected Versions</span></b><b><span style="font-family:"Calibri",sans-serif;mso-ligatures:none"><o:p></o:p></span></b></p>
<ul type="disc">
<li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo3;background:white">
<span style="font-family:"Calibri",sans-serif;mso-ligatures:none">Zimbra Collaboration Suite 10.0.x Webmail Classic UI<o:p></o:p></span></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo3;background:white">
<span style="font-family:"Calibri",sans-serif;mso-ligatures:none">Zimbra Collaboration Suite 10.1.x Webmail Classic UI<o:p></o:p></span></li></ul>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white">
<b><span style="font-family:"Calibri",sans-serif;color:black;mso-ligatures:none">Fixed Versions</span></b><b><span style="font-family:"Calibri",sans-serif;mso-ligatures:none"><o:p></o:p></span></b></p>
<ul type="disc">
<li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo6;background:white">
<span style="font-family:"Calibri",sans-serif;mso-ligatures:none">Zimbra Collaboration Suite 10.0.18 and later<o:p></o:p></span></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo6;background:white">
<span style="font-family:"Calibri",sans-serif;mso-ligatures:none">Zimbra Collaboration Suite 10.1.13 and later<o:p></o:p></span></li></ul>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white">
<span style="font-family:"Calibri",sans-serif;color:black">For more information directly from Vite please see the link here:
<a href="https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories"><span style="color:blue;background:white">Zimbra Security Advisory – CVE-2025-68645</span></a></span><span style="font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white">
<b><u><span style="font-family:"Calibri",sans-serif;color:black">Intelligence</span></u></b><b><span style="font-family:"Calibri",sans-serif;color:black">:
</span></b><span style="font-family:"Calibri",sans-serif;color:black">As of January 22, 2026, CISA has confirmed the vulnerability as being exploited in the wild and has added it to the Known Exploited Vulnerabilities Catalog.</span><span style="font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white">
<strong><span style="font-family:"Calibri",sans-serif;color:black;background:white">Exploitability Level:</span></strong><span style="font-family:"Calibri",sans-serif;color:black;background:white"> Low Complexity, Network Exploitability</span><span style="font-family:"Calibri",sans-serif;color:black"><br>
<strong><span style="font-family:"Calibri",sans-serif;background:white">Complexity:</span></strong><span style="background:white"> Low</span><br>
<strong><span style="font-family:"Calibri",sans-serif;background:white">User Interaction:</span></strong><span style="background:white"> Required</span><br>
<strong><span style="font-family:"Calibri",sans-serif;background:white">Remotely Exploitable:</span></strong><span style="background:white"> Yes</span><br>
<strong><span style="font-family:"Calibri",sans-serif;background:white">Proof of Concept:</span></strong><span style="background:white"> Publicly available (Nuclei templates and technical discussions exist)</span><br>
<strong><span style="font-family:"Calibri",sans-serif;background:white">Zero Day:</span></strong><span style="background:white"> No<o:p></o:p></span></span></p>
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<b><u><span style="font-family:"Calibri",sans-serif;color:black;mso-ligatures:none">Workarounds</span></u></b><b><span style="font-family:"Calibri",sans-serif;color:black;mso-ligatures:none">:
</span></b><span style="font-family:"Calibri",sans-serif;color:black;mso-ligatures:none">Disable the Classic UI if it is not required for your organization; Implement network-level restrictions to block external access to the /h/rest endpoint or reverse proxy.<o:p></o:p></span></p>
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<b><u><span style="font-family:"Calibri",sans-serif;color:black;mso-ligatures:none">How it Works</span></u></b><b><span style="font-family:"Calibri",sans-serif;color:black;mso-ligatures:none">:
</span></b><span style="font-family:"Calibri",sans-serif;color:black;mso-ligatures:none">An unauthenticated remote attacker can craft requests to the /h/rest endpoint to influence internal request dispatching, allowing the inclusion of arbitrary files from
the WebRoot directory<o:p></o:p></span></p>
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<b><u><span style="font-family:"Calibri",sans-serif;color:black;mso-ligatures:none">Post-Exploit Impact</span></u></b><b><span style="font-family:"Calibri",sans-serif;color:black;mso-ligatures:none">:</span></b><span style="font-family:"Calibri",sans-serif;color:black;mso-ligatures:none">
Information Disclosure: Exposure of sensitive configuration files, environment data, or internal credentials (CWE:CWE-200) and Arbitrary File Inclusion: Ability to include and view internal files like /WEB-INF/web.xml (CWE:CWE-98).</span><span style="font-family:"Calibri",sans-serif;mso-ligatures:none"><o:p></o:p></span></p>
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<b><u><span style="font-family:"Calibri",sans-serif;color:black;mso-ligatures:none">Indicators of Compromise (IoCs)</span></u></b><b><span style="font-family:"Calibri",sans-serif;color:black;mso-ligatures:none">:</span></b><b><u><span style="font-family:"Calibri",sans-serif;mso-ligatures:none"><o:p></o:p></span></u></b></p>
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<p class="MsoNormal" style="margin-top:12.0pt"><b><span style="font-family:"Calibri",sans-serif;color:black;mso-ligatures:none">Type</span></b><b><span style="font-family:"Calibri",sans-serif;mso-ligatures:none"><o:p></o:p></span></b></p>
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<p class="MsoNormal" style="margin-top:12.0pt"><b><span style="font-family:"Calibri",sans-serif;color:black;mso-ligatures:none">Value</span></b><b><span style="font-family:"Calibri",sans-serif;mso-ligatures:none"><o:p></o:p></span></b></p>
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<p class="MsoNormal" style="margin-top:12.0pt"><b><span style="font-family:"Calibri",sans-serif;color:black;mso-ligatures:none">Description / Notes</span></b><b><span style="font-family:"Calibri",sans-serif;mso-ligatures:none"><o:p></o:p></span></b></p>
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<p class="MsoNormal" style="margin-top:12.0pt"><b><span style="font-family:"Calibri",sans-serif;color:black;mso-ligatures:none">Source</span></b><b><span style="font-family:"Calibri",sans-serif;mso-ligatures:none"><o:p></o:p></span></b></p>
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<p class="MsoNormal" style="margin-top:12.0pt"><span style="font-family:"Calibri",sans-serif;color:black;mso-ligatures:none">Log Pattern</span><span style="font-family:"Calibri",sans-serif;mso-ligatures:none"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-top:12.0pt"><span style="font-family:"Calibri",sans-serif;color:black;mso-ligatures:none">GET /h/rest? javax.servlet.include.servlet_path=/WEB-INF/web.xml</span><span style="font-family:"Calibri",sans-serif;mso-ligatures:none"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-top:12.0pt"><span style="font-family:"Calibri",sans-serif;color:black;mso-ligatures:none">Monitor logs for unexpected calls to the rest endpoint attempting to access internal configuration files</span><span style="font-family:"Calibri",sans-serif;mso-ligatures:none"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-top:12.0pt"><span style="font-family:"Calibri",sans-serif;color:black;mso-ligatures:none">ProjectDiscovery</span><span style="font-family:"Calibri",sans-serif;mso-ligatures:none"><o:p></o:p></span></p>
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<b><u><span style="font-family:"Calibri",sans-serif;color:black;mso-ligatures:none">Tenable Plugins</span></u></b><b><span style="font-family:"Calibri",sans-serif;color:black;mso-ligatures:none">:
</span></b><span style="font-family:"Calibri",sans-serif;color:black;mso-ligatures:none">As of January 22, 2026, Tenable has not released any plugins for the vulnerability and has no plugins in the pipeline.</span><b><u><span style="font-family:"Calibri",sans-serif;mso-ligatures:none"><o:p></o:p></span></u></b></p>
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<b><u><span style="font-family:"Calibri",sans-serif;color:black;mso-ligatures:none">Recommended Actions</span></u></b><b><span style="font-family:"Calibri",sans-serif;color:black;mso-ligatures:none">:</span></b><b><u><span style="font-family:"Calibri",sans-serif;mso-ligatures:none"><o:p></o:p></span></u></b></p>
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<b><span style="font-family:"Calibri",sans-serif;color:black;mso-ligatures:none">Date Added to KEV Catalog:</span></b><span style="font-family:"Calibri",sans-serif;color:black;mso-ligatures:none"> 01/22/2026<br>
<b>Due Date for Remediation:</b> 02/12/2026<o:p></o:p></span></p>
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<li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo9;background:white">
<span style="font-family:"Calibri",sans-serif;mso-ligatures:none">Identify all Zimbra instances running vulnerable Webmail Classic UI versions<o:p></o:p></span></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo9;background:white">
<span style="font-family:"Calibri",sans-serif;mso-ligatures:none">Apply vendor-provided patches or upgrade to fixed releases as soon as possible<o:p></o:p></span></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo9;background:white">
<span style="font-family:"Calibri",sans-serif;mso-ligatures:none">Verify host has not been compromised before applying patches.<o:p></o:p></span></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo9;background:white">
<span style="font-family:"Calibri",sans-serif;mso-ligatures:none">Apply appropriate updates provided by the vendor to vulnerable systems after testing.<o:p></o:p></span></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo9;background:white">
<span style="font-family:"Calibri",sans-serif;mso-ligatures:none">Run all software as a non-privileged user to reduce the impact of a successful attack.<o:p></o:p></span></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo9;background:white">
<span style="font-family:"Calibri",sans-serif;mso-ligatures:none">Apply the Principle of Least Privilege to all systems and services.<o:p></o:p></span></li></ul>
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<p class="MsoNormal" style="line-height:105%"><b><span style="font-size:11.0pt;line-height:105%;font-family:"Calibri",sans-serif;mso-ligatures:none;mso-fareast-language:ZH-CN">Cyber Security Services<o:p></o:p></span></b></p>
<p class="MsoNormal" style="line-height:105%"><span style="font-size:11.0pt;line-height:105%;font-family:"Calibri",sans-serif;mso-ligatures:none;mso-fareast-language:ZH-CN">State of Oregon Cyber Security Services<o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:105%"><span style="font-size:11.0pt;line-height:105%;font-family:"Calibri",sans-serif;mso-ligatures:none;mso-fareast-language:ZH-CN">Enterprise Information Services | SOC<o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:105%"><span style="font-size:11.0pt;line-height:105%;font-family:"Calibri",sans-serif;mso-ligatures:none;mso-fareast-language:ZH-CN">Cyber Security Services (CSS)<o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:105%"><span style="font-size:11.0pt;line-height:105%;font-family:"Calibri",sans-serif;mso-ligatures:none;mso-fareast-language:ZH-CN">SOC Hotline: (503) 378-5930 | SOC Services (503) 373-0378<span style="color:#1F497D"><o:p></o:p></span></span></p>
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