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CVE-2019-9621

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

7.5 HIGHActively exploited (CISA KEV)Public exploitEPSS 81.0%
  1. Published30 Apr 2019
  2. Added to CISA KEV7 Jul 2025
  3. Remediation due28 Jul 2025
Actively exploited (CISA KEV)

Synacor Zimbra Collaboration Suite (ZCS) contains a server-side request forgery (SSRF) vulnerability via the ProxyServlet component.

Added to KEV: 7 Jul 2025Federal remediation due: 28 Jul 2025

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

Synacor Zimbra Collaboration Suite≥ 8.7.0 < 8.7.11 · ≥ 8.8.0 < 8.8.9 · < 8.6.0 · 8.6.0

Remediation

Fixed in
Synacor Zimbra Collaboration Suite≥ 8.7.11

References

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Frequently asked

Is CVE-2019-9621 being actively exploited?

Yes. CVE-2019-9621 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 7 Jul 2025.

How severe is CVE-2019-9621?

CVE-2019-9621 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 81.0% probability of exploitation.

Which products are affected by CVE-2019-9621?

Affected products include Synacor Zimbra Collaboration Suite.

How do I fix CVE-2019-9621?

Upgrade affected software to a fixed version, for example Synacor Zimbra Collaboration Suite 8.7.11 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2019-9621 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.