CVE-2019-11356

Name: CVE-2019-11356
Creator: NVD / NIST
Published: 2019-06-03T20:29:00.297+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 7.62%

Last modified Jun 17, 2026

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

9.8/10

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

EPSS Probability

7.62%

93.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

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://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 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://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 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: Jun 3, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-11356?

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.

Are you affected by CVE-2019-11356?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST