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Fencer Vulns
critical 9.8

CVE-2019-11356 json

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 vi…

published 2019-06-03 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-3035

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
7.6%
EPSS 7.6% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

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.

Patch / fix

  • cyrus-imapd Debian 14, Debian 13, Debian 12 3.0.8-6

debian advisories DEBIAN-CVE-2019-11356

  • cyrus-imapd Ubuntu 18.04 LTS 2.5.10-3ubuntu1.1

ubuntu advisories UBUNTU-CVE-2019-11356

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • cyrus-imapd RHEL 8 3.0.7-15.el8_0.1
  • cyrus-imapd-vzic RHEL 8 3.0.7-15.el8_0.1
  • cyrus-imapd-utils RHEL 8 3.0.7-15.el8_0.1

red hat advisories RHSA-2019:1771

  • cyrus-imapd openSUSE Tumbleweed 3.8.4-1.1

opensuse advisories openSUSE-SU-2025:14968-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-11356 updated cvss 5.6

cyrus-imapd: buffer overflow in CalDAV request handling triggered by a long iCalendar property name

  • Red Hat Enterprise Linux AppStream (v. 8) cyrus-imapd 3.0.7-15.el8_0.1, cyrus-imapd-vzic 3.0.7-15.el8_0.1, cyrus-imapd-utils 3.0.7-15.el8_0.1
    fixed: vendor fix RHSA-2019:1771
  • Red Hat Enterprise Linux 5 cyrus-imapd Red Hat Enterprise Linux 6 cyrus-imapd, cyrus-imapd-utils Red Hat Enterprise Linux 7 cyrus-imapd, cyrus-imapd-utils
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

7.62% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.