Home/CVE/Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery (SSRF) Vulnerability
CVE

CVE-2019-9621

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

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.

HIGH · CVSS 7.5 ⚠ CISA KEV EPSS 0.94113
Act now
  • Listed on CISA KEV (known exploited in the wild)
  • SSVC exploitation status: active
  • EPSS ≥ 0.50 - high probability of exploitation in the next 30 days
  • EPSS percentile: top 0% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬢

Required Remediation

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

⬡

Weakness Classification

CWE-918Server-Side Request Forgery (SSRF)
CWE-918Server-Side Request Forgery (SSRF)
▤

Affected Products & Versions

4
synacor zimbra collaboration suite< 8.6.0
synacor zimbra collaboration suite>= 8.7.0 and < 8.7.11
synacor zimbra collaboration suite>= 8.8.0 and < 8.8.9
synacor zimbra collaboration suiteall versions
⚠

Public Exploits & PoCs

7
webappsZimbra < 8.8.11 - XML External Entity Injection / Server-Side Request Forgery2019-06-05
remoteZimbra Collaboration - Autodiscover Servlet XXE and ProxyServlet SSRF (Metasploit)verified
nucleiZimbra Collaboration Suite - SSRFhigh
pocpacketstormsecurity.com · Zimbra-Collaboration-Autodiscover-Servlet-XXE-ProxyServle...packetstormsecurity.com
pocpacketstormsecurity.com · Zimbra-XML-Injection-Server-Side-Request-Forgery.htmlpacketstormsecurity.com
pocwww.rapid7.com · zimbra_xxe_rcewww.rapid7.com
pocwww.exploit-db.com · 46693www.exploit-db.com
◈

Detection Rules (IDS/IPS)

1
et-openET EXPLOIT Zimbra <8.8.11 - XML External Entity Injection/SSRF Attempt (CVE-2019-9621)attempted-user
Open rulesets (ET Open, Snort Community, abuse.ch) link to source. Commercial rulesets are reference-only.
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD30 Apr 2019 · 06:29 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
SSVC triage · cisa-vulnrichment
Exploitation
active
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

1
cisaKEV-CVE-2019-9621
🔗

References & Sources

5
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://blog.tint0.com/2019/03/a-saga-of-code-executions-on-zimbra.htmlThird Party Advisory
https://blog.zimbra.com/2019/03/9826/Vendor Advisory
https://bugzilla.zimbra.com/show_bug.cgi?id=109127Issue Tracking
https://wiki.zimbra.com/wiki/Security_CenterRelease NotesVendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-9621US Government Resource
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