CVE-2019-11356

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 7.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-06-03 · updated 2026-06-17
Weakness: CWE-787

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.

Affected products

Canonical Ubuntu Linux: 18.04
cyrusimap Cyrus IMAP: from 2.5.0 through 2.5.12; from 3.0.0 through 3.0.9
Debian Linux: 9.0
Fedoraproject Fedora: 29, 30
Red Hat Enterprise Linux: 8.0
RedHat Enterprise Linux Eus: 8.1, 8.2, 8.4
RedHat Enterprise Linux Server Aus: 8.2, 8.4
RedHat Enterprise Linux Server Tus: 8.2, 8.4

References

https://access.redhat.com/errata/RHSA-2019:1771
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/9
https://usn.ubuntu.com/4566-1/
https://www.cyrusimap.org/imap/download/release-notes/2.5/index.html
https://www.cyrusimap.org/imap/download/release-notes/2.5/x/2.5.13.html
https://www.cyrusimap.org/imap/download/release-notes/3.0/index.html
https://www.cyrusimap.org/imap/download/release-notes/3.0/x/3.0.10.html
https://www.debian.org/security/2019/dsa-4458
https://access.redhat.com/errata/RHSA-2019:1771
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IGO43JS7IFDNITHXOOHOP6JHRKRDIYY6/

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