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CVE-2020-7796

Synacor — Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery Vulnerability

Synacor · CWE-918 — Server-side request forgery · in CISA KEV since 2026-02-17

CISA federal deadline · Overdue by 7 monthsCISA KEVActively Exploited
86

EVRS 86 of 100 Immediate

Patch Immediately

Rank 358 of 2,960 tracked

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Why it scores 86

Evidence available: 6 of 7 signals

Listed in the CISA KEV catalog, and an EPSS probability of 0.844.

  • CISA KEVApplied
  • RansomwareDid not apply
  • Vendor exploitationDid not apply
  • EPSSApplied
  • Microsoft Exploitability IndexNot applicable
  • Pre-patch disclosureNo data
  • KEV recencyDid not apply
  • CVSSApplied

The band answers “how soon”, not “how bad”. No data for: Pre-patch disclosure. Why some signals show no data

Fix

Patch or fixed version identified

CISA required action

Fixed in

zimbra collaboration suite: update to 8.8.15 or later

Affected versions

  • zimbra collaboration suite< 8.8.158.8.15

Remediation

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Fixed versions from NVD.

Evidence

Each value with its source
MeasureValueSource
CVSS base scoreHow severe the flaw is in itself. It does not say how likely an attack is. 9.8 NVD
FIRST EPSSFIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs. 0.844 (99.7th pctl) FIRST EPSS
Actively exploitedWhether a source of record has confirmed attacks using it in the wild. Confirmed CISA KEV
Ransomware campaign useWhether CISA has seen ransomware operators use it. Unknown or none CISA KEV
CISA remediation deadlineThe date US federal agencies must have fixed or mitigated it. 2026-03-10 · CISA federal deadline · Overdue by 7 months CISA KEV
Public exploit moduleA module existing is not the same as active exploitation. None known Metasploit
EUVD cross-referenceENISA's record: CVSS 9.8 (v3.1), assigned by mitre. Listed ENISA EUVD

Description

NVD

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

What CISA says to do