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Fencer Intel
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 7y ago modified 4mo 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

Is CVE-2019-11356 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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, 2026-11-09).

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 Intel 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.