CVE-2019-9621

CRITICALNVD 7.59.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2025-07-07), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 7.5 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 4 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 81%CVSS: 7.5Exploit: cisa kev · ssvc active · Metasploit · Exploit-DB (verified) · epss top5pct · epss high · public exploitExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
7.5
EG Score
9.0(high)
EG Risk
96(Attend)
EG Risk 96/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity90% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
81%
EPSS %ILE
100%
KEV
⚠ Exploited

Published

April 30, 2019

Last Modified

November 4, 2025

Advisory Details (9)

Auto-updated Jun 6, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic

Packet Storm

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

Zimbra Collaboration - Autodiscover Servlet XXE and ProxyServlet SSRF (Metasploit) - Linux remote Exploit

https://www.exploit-db.com/exploits/46693/
generic

Zimbra Security Advisories - Zimbra :: Tech Center

https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
generic🔴 Active Exploitation

Security Center - Zimbra :: Tech Center

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

109127 – SSRF vulnerability - ProxyServlet [CWE-918 / CWE-807]

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

[REPOST] Recent Zimbra XXE / SSRF Vulnerability Disclosure - Zimbra : Blog

https://blog.zimbra.com/2019/03/9826/
generic🔴 Active Exploitation

An Trinh's past works: A Saga of Code Executions on Zimbra

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

Rapid7 Vulnerability Database

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

Packet Storm

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

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 54× in last 7d / 227× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 820 total refreshes for this CVE.

  1. 2026-09-19 15:37 UTCEPSS rescore
  2. 2026-09-19 13:58 UTCGHSA enrichment
  3. 2026-09-19 10:04 UTCGHSA enrichment
  4. 2026-09-19 06:12 UTCGHSA enrichment
  5. 2026-09-19 02:18 UTCGHSA enrichment
  6. 2026-09-18 22:26 UTCEG score recompute
  7. 2026-09-18 22:26 UTCGHSA enrichment
  8. 2026-09-18 19:23 UTCEPSS rescore
  9. 2026-09-18 19:20 UTCCISA KEV update
  10. 2026-09-18 18:34 UTCGHSA enrichment
  11. 2026-09-18 14:42 UTCGHSA enrichment
  12. 2026-09-18 14:15 UTCCISA KEV update
  13. 2026-09-18 10:50 UTCGHSA enrichment
  14. 2026-09-18 06:58 UTCGHSA enrichment
  15. 2026-09-18 03:06 UTCGHSA enrichment
  16. 2026-09-17 23:14 UTCGHSA enrichment
  17. 2026-09-17 19:22 UTCGHSA enrichment
  18. 2026-09-17 15:30 UTCGHSA enrichment
  19. 2026-09-17 11:37 UTCGHSA enrichment
  20. 2026-09-17 07:45 UTCGHSA enrichment
  21. 2026-09-17 03:53 UTCGHSA enrichment
  22. 2026-09-17 00:01 UTCGHSA enrichment
  23. 2026-09-16 20:09 UTCGHSA enrichment
  24. 2026-09-16 16:17 UTCEG score recompute
  25. 2026-09-16 16:16 UTCGHSA enrichment
Show 75 more
  1. 2026-09-16 14:10 UTCCISA KEV update
  2. 2026-09-16 14:04 UTCEPSS rescore
  3. 2026-09-16 12:21 UTCGHSA enrichment
  4. 2026-09-16 08:29 UTCGHSA enrichment
  5. 2026-09-16 04:32 UTCGHSA enrichment
  6. 2026-09-16 00:40 UTCGHSA enrichment
  7. 2026-09-15 20:45 UTCGHSA enrichment
  8. 2026-09-15 16:53 UTCGHSA enrichment
  9. 2026-09-15 13:01 UTCGHSA enrichment
  10. 2026-09-15 09:09 UTCGHSA enrichment
  11. 2026-09-15 05:17 UTCEG score recompute
  12. 2026-09-15 05:16 UTCGHSA enrichment
  13. 2026-09-15 03:06 UTCEPSS rescore
  14. 2026-09-15 01:23 UTCGHSA enrichment
  15. 2026-09-14 21:31 UTCGHSA enrichment
  16. 2026-09-14 19:24 UTCCISA KEV update
  17. 2026-09-14 17:39 UTCGHSA enrichment
  18. 2026-09-14 13:47 UTCGHSA enrichment
  19. 2026-09-14 09:55 UTCGHSA enrichment
  20. 2026-09-14 06:01 UTCGHSA enrichment
  21. 2026-09-14 02:09 UTCGHSA enrichment
  22. 2026-09-13 22:17 UTCGHSA enrichment
  23. 2026-09-13 18:25 UTCGHSA enrichment
  24. 2026-09-13 14:33 UTCGHSA enrichment
  25. 2026-09-13 10:41 UTCGHSA enrichment
  26. 2026-09-13 06:49 UTCGHSA enrichment
  27. 2026-09-13 02:57 UTCGHSA enrichment
  28. 2026-09-12 23:05 UTCGHSA enrichment
  29. 2026-09-12 19:13 UTCGHSA enrichment
  30. 2026-09-12 15:20 UTCEG score recompute
  31. 2026-09-12 15:20 UTCGHSA enrichment
  32. 2026-09-12 14:56 UTCEPSS rescore
  33. 2026-09-12 11:28 UTCGHSA enrichment
  34. 2026-09-12 07:35 UTCGHSA enrichment
  35. 2026-09-12 03:41 UTCGHSA enrichment
  36. 2026-09-11 23:49 UTCGHSA enrichment
  37. 2026-09-11 19:57 UTCGHSA enrichment
  38. 2026-09-11 18:49 UTCCISA KEV update
  39. 2026-09-11 16:05 UTCGHSA enrichment
  40. 2026-09-11 12:12 UTCGHSA enrichment
  41. 2026-09-11 08:19 UTCGHSA enrichment
  42. 2026-09-11 04:27 UTCGHSA enrichment
  43. 2026-09-11 00:35 UTCGHSA enrichment
  44. 2026-09-10 20:43 UTCGHSA enrichment
  45. 2026-09-10 19:28 UTCCISA KEV update
  46. 2026-09-10 16:51 UTCGHSA enrichment
  47. 2026-09-10 12:59 UTCEG score recompute
  48. 2026-09-10 12:59 UTCGHSA enrichment
  49. 2026-09-10 09:06 UTCGHSA enrichment
  50. 2026-09-10 05:14 UTCGHSA enrichment
  51. 2026-09-10 01:21 UTCGHSA enrichment
  52. 2026-09-09 21:27 UTCGHSA enrichment
  53. 2026-09-09 19:08 UTCCISA KEV update
  54. 2026-09-09 17:33 UTCGHSA enrichment
  55. 2026-09-09 13:40 UTCGHSA enrichment
  56. 2026-09-09 09:48 UTCGHSA enrichment
  57. 2026-09-09 05:56 UTCGHSA enrichment
  58. 2026-09-09 02:04 UTCGHSA enrichment
  59. 2026-09-08 22:10 UTCGHSA enrichment
  60. 2026-09-08 18:54 UTCCISA KEV update
  61. 2026-09-08 18:18 UTCGHSA enrichment
  62. 2026-09-08 14:25 UTCGHSA enrichment
  63. 2026-09-08 10:29 UTCGHSA enrichment
  64. 2026-09-08 06:36 UTCGHSA enrichment
  65. 2026-09-08 02:42 UTCGHSA enrichment
  66. 2026-09-07 22:50 UTCGHSA enrichment
  67. 2026-09-07 18:57 UTCGHSA enrichment
  68. 2026-09-07 15:04 UTCGHSA enrichment
  69. 2026-09-07 11:12 UTCGHSA enrichment
  70. 2026-09-07 07:17 UTCGHSA enrichment
  71. 2026-09-07 03:23 UTCGHSA enrichment
  72. 2026-09-06 23:31 UTCGHSA enrichment
  73. 2026-09-06 19:39 UTCGHSA enrichment
  74. 2026-09-06 15:43 UTCEG score recompute
  75. 2026-09-06 15:43 UTCGHSA enrichment

Publicly available exploits

(5 references)

Working exploit code is in the public domain (1 Metasploit module) (1 GitHub PoC) (2 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-46967
    First seen Jun 5, 2019

    Zimbra < 8.8.11 - XML External Entity Injection / Server-Side Request Forgery

    Open source ↗
  • GitHub PoCk8gege/ZimbraExploit
    First seen May 6, 2019

    Zimbra邮件系统漏洞 XXE/RCE/SSRF/Upload GetShell Exploit 1. (CVE-2019-9621 Zimbra<8.8.11 XXE GetShell Exploit)

    Open source ↗
  • Exploit-DBEDB-46693✓ verified
    First seen Apr 12, 2019

    Zimbra Collaboration - Autodiscover Servlet XXE and ProxyServlet SSRF (Metasploit)

    Open source ↗
  • Metasploitexploit/linux/http/zimbra_xxe_rce✓ verified
    First seen Mar 13, 2019

    Zimbra Collaboration Autodiscover Servlet XXE and ProxyServlet SSRF

    Open source ↗
  • Nucleihttp/cves/2019/CVE-2019-9621.yaml
    First seen Jan 1, 2019

    Zimbra Collaboration Suite - SSRF

    Open source ↗

Frequently asked(6)

What is CVE-2019-9621?
CVE-2019-9621 is a critical vulnerability published on April 30, 2019. 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.
When was CVE-2019-9621 disclosed?
CVE-2019-9621 was first published in the National Vulnerability Database on April 30, 2019, with the most recent update on November 4, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2019-9621 actively exploited?
Yes. CISA added CVE-2019-9621 to the Known Exploited Vulnerabilities catalog on July 7, 2025, affecting Synacor Zimbra Collaboration Suite (ZCS). KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2019-9621?
CVE-2019-9621 has a CVSS v3 base score of 7.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2019-9621?
CVE-2019-9621 affects Synacor Zimbra Collaboration Suite (ZCS). The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2019-9621?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-9621, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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