How severe is CVE-2020-7796?

CVE-2020-7796 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-7796 being actively exploited?

Yes. CVE-2020-7796 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-02-17, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2020-7796?

CVE-2020-7796 primarily affects Synacor Zimbra Collaboration Suite. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-7796?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2020-7796 have an EU (EUVD) identifier?

Yes. CVE-2020-7796 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2020-28728. It is also flagged as exploited in the EUVD (since 2026-02-17).

When was CVE-2020-7796 published?

CVE-2020-7796 was published on 2020-02-18 and last updated on 2026-06-17.

CVE-2020-7796

CVE-2020-7796 is a critical-severity vulnerability in Synacor Zimbra Collaboration Suite with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2026-02-17). The underlying weakness is classified as CWE-918.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 6.8
EPSS exploit prediction: 85% (100th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2026-02-17)
EU (EUVD) id: EUVD-2020-28728
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2026-02-17)
Weakness: CWE-918
Affected product: Synacor Zimbra Collaboration Suite
Published: 2020-02-18
Last modified: 2026-06-17

Description

Zimbra Collaboration Suite (ZCS) before 8.8.15 Patch 7 allows SSRF when WebEx zimlet is installed and zimlet JSP is enabled.

Frequently asked questions

What is CVE-2020-7796?: Zimbra Collaboration Suite (ZCS) before 8.8.15 Patch 7 allows SSRF when WebEx zimlet is installed and zimlet JSP is enabled.
How severe is CVE-2020-7796?: CVE-2020-7796 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-7796 being actively exploited?: Yes. CVE-2020-7796 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-02-17, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2020-7796?: CVE-2020-7796 primarily affects Synacor Zimbra Collaboration Suite. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-7796?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2020-7796 have an EU (EUVD) identifier?: Yes. CVE-2020-7796 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2020-28728. It is also flagged as exploited in the EUVD (since 2026-02-17).
When was CVE-2020-7796 published?: CVE-2020-7796 was published on 2020-02-18 and last updated on 2026-06-17.

References

Affected products (8)

cpe:2.3:a:synacor:zimbra_collaboration_suite:*:*:*:*:*:*:*:*
cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:-:*:*:*:*:*:*
cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p1:*:*:*:*:*:*
cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p2:*:*:*:*:*:*
cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p3:*:*:*:*:*:*
cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p4:*:*:*:*:*:*
cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p5:*:*:*:*:*:*
cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p6:*:*:*:*:*:*

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