CVE-2019-11356
CRITICALCVSS 9.8/10EPSS 7.62%
Last modified
CVE-2019-11356 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. The CalDAV feature in httpd in Cyrus IMAP 2.5.x through 2.5.12 and 3.0.x through 3.0.9 allows remote attackers to execute arbitrary code via a crafted HTTP PUT operation for an event with a long iCalendar property name.. EPSS estimates a 7.62% chance of exploitation in the next 30 days.
Description
The CalDAV feature in httpd in Cyrus IMAP 2.5.x through 2.5.12 and 3.0.x through 3.0.9 allows remote attackers to execute arbitrary code via a crafted HTTP PUT operation for an event with a long iCalendar property name.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Cyrus | Imap | >= 2.5.0, <= 2.5.12 |
| Cyrus | Imap | >= 3.0.0, <= 3.0.9 |
| Fedoraproject | Fedora | 29 |
| Fedoraproject | Fedora | 30 |
| Debian | Debian Linux | 9.0 |
| Canonical | Ubuntu Linux | 18.04 |
| Redhat | Enterprise Linux | 8.0 |
| Redhat | Enterprise Linux Eus | 8.1 |
| Redhat | Enterprise Linux Eus | 8.2 |
| Redhat | Enterprise Linux Eus | 8.4 |
| Redhat | Enterprise Linux Server Aus | 8.2 |
| Redhat | Enterprise Linux Server Aus | 8.4 |
| Redhat | Enterprise Linux Server Tus | 8.2 |
| Redhat | Enterprise Linux Server Tus | 8.4 |
References
- https://access.redhat.com/errata/RHSA-2019:1771Third Party Advisory
- https://seclists.org/bugtraq/2019/Jun/9Mailing List, Third Party Advisory
- https://usn.ubuntu.com/4566-1/Third Party Advisory
- https://www.cyrusimap.org/imap/download/release-notes/2.5/index.htmlRelease Notes, Vendor Advisory
- https://www.cyrusimap.org/imap/download/release-notes/2.5/x/2.5.13.htmlRelease Notes, Vendor Advisory
- https://www.cyrusimap.org/imap/download/release-notes/3.0/index.htmlRelease Notes, Vendor Advisory
- https://www.cyrusimap.org/imap/download/release-notes/3.0/x/3.0.10.htmlRelease Notes, Vendor Advisory
- https://www.debian.org/security/2019/dsa-4458Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1771Third Party Advisory
- https://seclists.org/bugtraq/2019/Jun/9Mailing List, Third Party Advisory
- https://usn.ubuntu.com/4566-1/Third Party Advisory
- https://www.cyrusimap.org/imap/download/release-notes/2.5/index.htmlRelease Notes, Vendor Advisory
- https://www.cyrusimap.org/imap/download/release-notes/2.5/x/2.5.13.htmlRelease Notes, Vendor Advisory
- https://www.cyrusimap.org/imap/download/release-notes/3.0/index.htmlRelease Notes, Vendor Advisory
- https://www.cyrusimap.org/imap/download/release-notes/3.0/x/3.0.10.htmlRelease Notes, Vendor Advisory
- https://www.debian.org/security/2019/dsa-4458Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2019-11356?
The CalDAV feature in httpd in Cyrus IMAP 2.5.x through 2.5.12 and 3.0.x through 3.0.9 allows remote attackers to execute arbitrary code via a crafted HTTP PUT operation for an event with a long iCalendar property name.
How severe is CVE-2019-11356?
CVE-2019-11356 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 7.62% probability of exploitation in the next 30 days.
How do I fix CVE-2019-11356?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2019-11356?
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