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CISA KEV · Known exploitedHigh

CVE-2019-9621

Synacor Zimbra Collaboration Suite (ZCS)

Zimbra Collaboration Suite before 8.6 patch 13, 8.7.x before 8.7.11 patch 10, and 8.8.x before 8.8.10 patch 7 or 8.8.x before 8.8.11 patch 3 allows SSRF via the ProxyServlet component.

CVSS
7.5
EPSS
80.9%
99.6% percentile
CISA KEV
Listed
Published
2019.05.01
PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV
Exploit probability80.9%
Technical severityCVSS 7.5

Vulnerability overview

Zimbra Collaboration Suite before 8.6 patch 13, 8.7.x before 8.7.11 patch 10, and 8.8.x before 8.8.10 patch 7 or 8.8.x before 8.8.11 patch 3 allows SSRF via the ProxyServlet component.

Affected product and versions

Product
Synacor Zimbra Collaboration Suite (ZCS)
Affected versions
< 8.6.0, >= 8.7.0 < 8.7.11, >= 8.8.0 < 8.8.9, 8.6.0, 8.7.11, 8.8.9, 8.8.10, 8.8.11
Fixed versions
8.6.0, 8.7.11, 8.8.9

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
CISA required action

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

Due date: 2025.07.28
  1. 1
    Identify

    Confirm that Synacor Zimbra Collaboration Suite (ZCS) and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE
CWE-807, CWE-918
KEV added
2025.07.07
Ransomware use
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