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ExploitedIn CISA KEVFix available

CVE-2019-9621

Exploitation confirmed. First attested on 2025-07-07 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2019-04-30
  • Fixed in8.8.9 · 8.7.11 · 8.6.0
  • WeaknessCWE-918

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2019-04-12Exploit-DB entryExploit-DB
  2. 2019-04-3018:29CVE publishedNVD
  3. 2025-07-07Added to the CISA KEV catalogCISA KEV
  4. 2025-07-07Listed as exploited by GCVEGCVE
  5. 2025-07-07Exploitation first reportedCISA KEV
  6. 2025-07-1703:55SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-04 09:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2019-9621?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2019-9621?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Synacor zimbra collaboration suite
BranchAffectedFixed in
8.8≥ 8.8.0, < 8.8.98.8.9
8.7≥ 8.7.0, < 8.7.118.7.11
8.6< 8.6.08.6.0
8.6= 8.6.0no fix published
8.7= 8.7.11no fix published
8.8= 8.8.9no fix published
8.8= 8.8.10no fix published
8.8= 8.8.11no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Synacor zimbra collaboration suite to 8.8.9 · 8.7.11 · 8.6.0
  2. CISA’s 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 2025-07-28

Advisories and patches

Detection

read 2026-11-03 22:42 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
EDB-46693EDB-46967
Exploit-DB
Proof-of-concept repositories
1 repository, unverifiedk8gege/ZimbraExploit
PoC-in-GitHub
Metasploit modules
1 moduleexploit/linux/http/zimbra_xxe_rcerank: excellentModule metadata: Metasploit Framework, © Rapid7, Inc., BSD-3-Clause.
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2025-07-07
Patch Due Date
2025-07-28
Ransomware Use
Unknown
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.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
2019-04-30
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-gf2h-5qx6-v9fr

Frequently asked questions

What is CVE-2019-9621?

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.

Is CVE-2019-9621 actively exploited?

Yes. CVE-2019-9621 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2025-07-28.

What is the CVSS score for CVE-2019-9621?

CVE-2019-9621 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

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Sources for this record