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Vulnerability record · CVE-2019-11356 · published 3 June 2019

CVE-2019-11356: Cyrus imap out-of-bounds write vulnerability

Cyrus · Imap

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.

9.8 CVSS 3.1 Critical EPSS 7.6% · top 5.6% CWE-787 · Out-of-bounds write
9.8CVSS 3.1 base score, v2 7.5
7.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
8Affected product versions listed by NVD
20References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

8 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/errata/RHSA-2019:1771 Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IGO43JS7IFDNITHXOOHOP6J
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PICSZDC3UGEUZ27VXGGM6OF
https://seclists.org/bugtraq/2019/Jun/9 Mailing ListThird Party Advisory
https://usn.ubuntu.com/4566-1/ Third Party Advisory
https://www.cyrusimap.org/imap/download/release-notes/2.5/index.html Release NotesVendor Advisory
https://www.cyrusimap.org/imap/download/release-notes/2.5/x/2.5.13.html Release NotesVendor Advisory
https://www.cyrusimap.org/imap/download/release-notes/3.0/index.html Release NotesVendor Advisory
https://www.cyrusimap.org/imap/download/release-notes/3.0/x/3.0.10.html Release NotesVendor Advisory
https://www.debian.org/security/2019/dsa-4458 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:1771 Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IGO43JS7IFDNITHXOOHOP6J
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PICSZDC3UGEUZ27VXGGM6OF
https://seclists.org/bugtraq/2019/Jun/9 Mailing ListThird Party Advisory
https://usn.ubuntu.com/4566-1/ Third Party Advisory
https://www.cyrusimap.org/imap/download/release-notes/2.5/index.html Release NotesVendor Advisory
https://www.cyrusimap.org/imap/download/release-notes/2.5/x/2.5.13.html Release NotesVendor Advisory
https://www.cyrusimap.org/imap/download/release-notes/3.0/index.html Release NotesVendor Advisory
https://www.cyrusimap.org/imap/download/release-notes/3.0/x/3.0.10.html Release NotesVendor Advisory
https://www.debian.org/security/2019/dsa-4458 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2019-11356), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.