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CVE-2019-9621

HIGH

7.5

CVSS Score

Published: April 30, 2019 at 05:40 PM UTC

Updated: June 17, 2026 at 02:44 AM UTC

1 product affected across 1 vendorCollaboration

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Severity

HIGH7.5

Exploitation

CISA KEV

Exploit prediction

EPSS 81%

SSVC

Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score81.0%

EPSS (Exploit Prediction Scoring System) estimates a 81.0% chance this CVE is exploited in the wild within the next 30 days — higher than 100% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

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

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.

Ransomware Use

Unknown

Added to KEV

Jul 7, 2025

Remediation Due

Jul 28, 2025

458 days overdue

Notes

https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories

https://wiki.zimbra.com/wiki/Security_Center

https://nvd.nist.gov/vuln/detail/CVE-2019-9621

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Collaboration · Synacor

95%

Affected range stops below 8.6.0, so it looks safe — our inference, not a vendor statement

Affected range stops below 8.7.11, so it looks safe — our inference, not a vendor statement

Affected range stops below 8.8.9, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (10)

x_refsource_MISCExploitThird Party AdvisoryVDB Entry

Source: [email protected]

http://packetstormsecurity.com/files/152487/Zimbra-Collaboration-Autodiscover-Servlet-XXE-ProxyServlet-SSRF.html

x_refsource_MISCExploitThird Party AdvisoryVDB Entry

Source: [email protected]

http://packetstormsecurity.com/files/153190/Zimbra-XML-Injection-Server-Side-Request-Forgery.html

x_refsource_MISCExploitThird Party Advisory

Source: [email protected]

http://www.rapid7.com/db/modules/exploit/linux/http/zimbra_xxe_rce

x_refsource_MISCThird Party Advisory

Source: [email protected]

https://blog.tint0.com/2019/03/a-saga-of-code-executions-on-zimbra.html

x_refsource_MISCVendor Advisory

Source: [email protected]

https://blog.zimbra.com/2019/03/9826/

x_refsource_MISCIssue Tracking

Source: [email protected]

https://bugzilla.zimbra.com/show_bug.cgi?id=109127

x_refsource_MISCRelease NotesVendor Advisory

Source: [email protected]

https://wiki.zimbra.com/wiki/Security_Center

x_refsource_CONFIRMx_refsource_MISCVendor Advisory

Source: [email protected]

https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories

SSVC — Action Prioritization

SSVCActiveAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHCISA-ADP

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: NONE
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-918

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