CVE-2020-7796 — zm-build
CRITICALCVE-2020-7796 is a critical-severity (CVSS 9.8) Server-Side Request Forgery (SSRF) vulnerability. It is in CISA's Known Exploited Vulnerabilities catalog (added 2026-02-17) — treat it as actively exploited and patch now. A fix is available — see the affected versions and patch details below.
Exploitation Status
Actively exploited in the wild
- Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2026-02-17. Federal agencies were required to remediate by 2026-03-10.
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- A successful exploit gives an attacker total control of the affected component, not partial access.
Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2020-7796.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2020-7796 by exploitation likelihood (EPSS) against impact (CVSS). In the shaded patch-first corner (EPSS 50%+, CVSS 7.0+).
Where this sits among everything scored
Of 394,803 CVEs with a current EPSS score, this one falls in the 50–90% band (highlighted). Counts from FIRST.org, log-scaled.
Description
Zimbra Collaboration Suite (ZCS) before 8.8.15 Patch 7 allows SSRF when WebEx zimlet is installed and zimlet JSP is enabled.
Affected Products
zimbra collaboration suitesynacorDetection & mitigation playbook
VulnerabilityDetect
Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).
Fix
Upgrade the affected component to the fixed release for CVE-2020-7796, or apply your distribution's backported patch — distro builds are often patched at an older version number, so check your vendor's advisory rather than the upstream version alone.
Workarounds
Restrict outbound requests from the affected component to an allowlist of hosts, block access to link-local and internal address ranges at the network layer, and require authentication on internal services so a forged request cannot reach them unauthenticated.
How to detect CVE-2020-7796
A community-maintained Nuclei template exists for this CVE. You can scan for it directly:
nuclei -id cve-2020-7796 -u https://target- Template
- Zimbra Collaboration Suite < 8.8.15 Patch 7 - Server-Side Request Forgery
- Severity
- critical
- Impact
- Successful exploitation of this vulnerability could allow an attacker to send arbitrary requests from the vulnerable server, potentially leading to unauthorized access or data leakage.
- Remediation
- Apply the latest patch or upgrade to Zimbra Collaboration Suite version 8.8.15 Patch 7 or higher to mitigate this vulnerability.
Template by ProjectDiscovery nuclei-templates (gy741), MIT licensed. View the full template. Scan only systems you are authorised to test.
Frequently Asked Questions
Is CVE-2020-7796 in your dependencies?
Find it across , including transitive dependencies.