CVE-2019-9621
Synacor Zimbra Collaboration Suite (ZCS): Server-Side Request Forgery (SSRF)
As of , CVE-2019-9621 in Synacor Zimbra Collaboration Suite (ZCS) is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch this week.
- Exploited
- Yes: CISA listed it on 7 July 2025
- US federal deadline
- 28 July 202521 days after CISA listed it. US federal civilian agencies must fix it by then.
- Used in ransomware campaigns
- Not known to CISA
- EPSS score
- 0.81Higher than 99% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
- Public exploit
- 1 Metasploit module and 2 Exploit-DB entries (1 verified)
- Fix
- Vendor advice: wiki.zimbra.comLinks below, from CISA's entry.
What CISA says to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CISA's required action
What the flaw is
Synacor Zimbra Collaboration Suite (ZCS) contains a server-side request forgery (SSRF) vulnerability via the ProxyServlet component.
CISA's 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.
The CVE record's description, from mitre
- CVE published
- 30 April 2019
- Assigned by
- mitre
- CVSS
- 7.5 High (CVSS 3.1, from CISA-ADP)
- CWE-918
- Server-Side Request Forgery (SSRF)
- CWE-807
- Reliance on Untrusted Inputs in a Security Decision
- CISA SSVC, exploitation
- active
- CISA SSVC, automatable
- yes
- CISA SSVC, technical impact
- partial
Timeline
- Exploit-DB published an exploit (EDB-ID 46693).
- The CVE record was published.
- Exploit-DB published an exploit (EDB-ID 46967).
- CISA added it to its list of exploited vulnerabilities.
- The US federal deadline to fix it.
Public exploits
Facts from Metasploit's module list and Exploit-DB's index; we never copy exploit code.
- Metasploit: Zimbra Collaboration Autodiscover Servlet XXE and ProxyServlet SSRFexploit module, rank excellent
- Exploit-DB: Zimbra Collaboration - Autodiscover Servlet XXE and ProxyServlet SSRF (Metasploit)EDB-ID 46693, verified by Exploit-DB, 12 April 2019
- Exploit-DB: Zimbra < 8.8.11 - XML External Entity Injection / Server-Side Request ForgeryEDB-ID 46967, 5 June 2019
Zimbra Collaboration Suite (ZCS): other exploited entries
| Vulnerability | Product | Our group | Listed | Deadline | EPSS |
|---|---|---|---|---|---|
| CVE-2026-73570OS Command Injection | Synacor Zimbra Collaboration Suite (ZCS) | Patch nowForensic triage required by CISA | 0.72 | ||
| CVE-2019-9670Improper Restriction of XML External Entity Reference | Synacor Zimbra Collaboration Suite (ZCS) | Patch this weekMetasploit module; EPSS 0.99; verified Exploit-DB entry | 0.99 | ||
| CVE-2022-41352Arbitrary File Upload | Synacor Zimbra Collaboration Suite (ZCS) | Patch this weekRansomware use; Metasploit module; EPSS 0.95 | 0.95 | ||
| CVE-2022-27925Arbitrary File Upload | Synacor Zimbra Collaboration Suite (ZCS) | Patch this weekRansomware use; Metasploit module; EPSS 0.99 | 0.99 | ||
| CVE-2022-37042Authentication Bypass | Synacor Zimbra Collaboration Suite (ZCS) | Patch this weekRansomware use; Metasploit module; EPSS 0.92 | 0.92 | ||
| CVE-2023-34192Cross-Site Scripting (XSS) | Synacor Zimbra Collaboration Suite (ZCS) | Patch this weekEPSS 0.77 | 0.77 | ||
| CVE-2024-45519Command Execution | Synacor Zimbra Collaboration Suite (ZCS) | Patch this weekEPSS 0.99 | 0.99 | ||
| CVE-2022-27924Command Injection | Synacor Zimbra Collaboration Suite (ZCS) | Patch this weekRansomware use; EPSS 0.94 | 0.94 | ||
| CVE-2018-6882Cross-Site Scripting (XSS) | Synacor Zimbra Collaboration Suite (ZCS) | Patch this weekRansomware use | 0.30 | ||
| CVE-2025-68645PHP Remote File Inclusion | Synacor Zimbra Collaboration Suite (ZCS) | Patch soon | 0.49 |
Read further
- CVE recordcve.org
- NVD entrynvd.nist.gov
- CISA's catalogcisa.gov
- EPSS for this CVEapi.first.org