: The flaw exists in the WebEx Zimlet ( com_zimbra_webex ) when its JSP (Jakarta Server Pages) functionality is enabled. It stems from insufficient validation of user-supplied input.
The security risk is amplified by its real-world impact. The Cybersecurity and Infrastructure Security Agency (CISA) added CVE-2020-7796 to its , warning organizations of active, in-the-wild exploitation by threat actors. Technical Analysis of the Vulnerability The Vulnerability Root Cause
: Data leakage, internal network scanning, and potential escalation if internal services have weaker authentication than public ones. Remediation: How to Protect Your Server
is a critical security flaw in the Zimbra Collaboration Suite (ZCS) that allows unauthenticated remote attackers to trigger Server-Side Request Forgery (SSRF) cve20207796 zimbra collaboration suite full
: SSRF can be used to scan internal networks, steal sensitive metadata, or access configuration files. No Authentication Required
Technical details (concise)
To evaluate if your environment is exposed to CVE-2020-7796, verify your deployments against these exact structural preconditions: Metric / Condition Risk Profile Details Synacor Zimbra Collaboration Suite (ZCS) Vulnerable Versions All versions prior to 8.8.15 Patch 7 Required Extension WebEx Zimlet must be actively installed Required Flag Zimlet JSP processing must be enabled natively Exploitation Metric High Likelihood (EPSS score historically tracked over 90%) Step-by-Step Remediation Strategy : The flaw exists in the WebEx Zimlet
Update the repository metadata: yum clean metadata && yum check-update Update your system: yum update Restart ZCS: su - zimbra -c "zmcontrol restart" 2. Manual Workaround
The simplicity of the solution (upgrading to Patch 7 or higher) means there is no excuse for leaving systems vulnerable. Cybercriminals are actively scanning for and exploiting this flaw. Therefore, the course of action is clear: . Do not let this critical vulnerability be the entry point for a larger, more devastating breach of your organization's network. Patch now to ensure your collaboration platform remains a tool for productivity, not a gateway for compromise.
attacks. This occurs due to improper validation of user-supplied URLs within specific application components. Successful exploitation enables an attacker to use the Zimbra server as a proxy to scan internal networks, access restricted internal services, or potentially execute arbitrary code 2. Technical Details Vulnerability Mechanism: The flaw resides in the ProxyServlet component and specifically affects environments where the WebEx zimlet is installed and zimlet JSP is enabled. Attack Vector: probe internal networks
: U.S. Federal agencies have been mandated to apply fixes by March 10, 2026 . Zimbra Collaboration Suite SSRF (CVE-2020-7796) - Acunetix
The Cybersecurity and Infrastructure Security Agency (CISA), a division of the US Department of Defense, has issued advisories highlighting the active exploitation of these vulnerabilities by well-organized threat actors. This is not a theoretical risk; it is actively being exploited in the wild.
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is a critical Server-Side Request Forgery (SSRF) vulnerability affecting the Zimbra Collaboration Suite (ZCS) . Assigned a maximum CVSS v3 base score of 9.8 out of 10 , this unauthenticated security flaw poses an extreme risk to enterprise communication infrastructure. Attackers can exploit this bug remotely to bypass firewalls, probe internal networks, or steal sensitive cloud credentials.