Known exploited vulnerability
CVE-2019-9621
The short answer
CVE-2019-9621 affects n/a n/a and is rated high (CVSS 7.5). CISA added it to the Known Exploited Vulnerabilities catalog on 2025-07-07: attackers are using it, so patch it first.
What it is
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.
Weakness: CWE-918.
Severity
7.5 high
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Exploited (CISA KEV)
Yes, since Jul 7, 2025
Federal due date Jul 28, 2025
EPSS, next 30 days
81%
Higher than 100% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- None
- Availability impact
- None
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.
Affected products
n/a. NVD's record lists the exact affected versions.
References
- blog.tint0.com/2019/03/a-saga-of-code-executions-on-zimbra.html Third Party Advisory
- blog.zimbra.com/2019/03/9826/ Vendor Advisory
- bugzilla.zimbra.com/show_bug.cgi?id=109127 Issue Tracking
- wiki.zimbra.com/wiki/Security_Center Release NotesVendor Advisory
- wiki.zimbra.com/wiki/Zimbra_Security_Advisories Vendor Advisory
- www.exploit-db.com/exploits/46693/ ExploitThird Party AdvisoryVDB Entry
- blog.tint0.com/2019/03/a-saga-of-code-executions-on-zimbra.html Third Party Advisory
- blog.zimbra.com/2019/03/9826/ Vendor Advisory
- bugzilla.zimbra.com/show_bug.cgi?id=109127 Issue Tracking
- wiki.zimbra.com/wiki/Security_Center Release NotesVendor Advisory
- wiki.zimbra.com/wiki/Zimbra_Security_Advisories Vendor Advisory
- www.exploit-db.com/exploits/46693/ ExploitThird Party AdvisoryVDB Entry
Questions
Is CVE-2019-9621 being exploited?
Yes. CISA added CVE-2019-9621 to its Known Exploited Vulnerabilities catalog on 2025-07-07, with a federal remediation due date of 2025-07-28.
How do I fix CVE-2019-9621?
CISA's 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.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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