Home/CVE/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 execut
CVE

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 execut

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.

CRITICAL · CVSS 9.8 EPSS 0.28246
Schedule remediation
  • EPSS ≥ 0.10 - elevated exploitation probability
  • EPSS percentile: top 3% of all CVEs by exploitation likelihood
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-787Out-of-bounds Write
▤

Affected Products & Versions

9
cyrus imap>= 2.5.0 and <= 2.5.12
cyrus imap>= 3.0.0 and <= 3.0.9
fedoraproject fedoraall versions
debian linuxall versions
canonical ubuntu linuxall versions
redhat enterprise linuxall versions
redhat enterprise linux eusall versions
redhat enterprise linux server ausall versions
▣

Scoring & Timeline

9.8
CRITICAL · 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 NVD03 Jun 2019 · 08:29 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
⚑

Vendor Advisories

3
suse-csafopenSUSE-SU-2025:14968-1
usnUSN-4566-1
rhsaRHSA-2019:1771Important
🔗

References & Sources

9
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IGO43JS7IFDNITHXOOHOP6JHRKRDIYY6/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PICSZDC3UGEUZ27VXGGM6OFI67D3KKLZ/
https://seclists.org/bugtraq/2019/Jun/9Mailing ListThird Party Advisory
https://usn.ubuntu.com/4566-1/Third Party Advisory
https://www.cyrusimap.org/imap/download/release-notes/2.5/index.htmlRelease NotesVendor Advisory
https://www.cyrusimap.org/imap/download/release-notes/2.5/x/2.5.13.htmlRelease NotesVendor Advisory
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