Is CVE-2019-11356 being actively exploited?

CVE-2019-11356 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2019-11356?

CVE-2019-11356 has a CVSS 3.1 base score of 9.8 (CRITICAL).

CVE-2019-11356

CRITICAL · CVSS 9.8EPSS 7.6%EU EUVD

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.

Key facts

CVSS score: 9.8 (v3.1)
Severity: CRITICAL
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-787
EPSS score: 7.6% (94th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2019-3035)
Published: June 3, 2019
NVD last modified: June 17, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2019-3035 in the EU Vulnerability Database. Last updated in EUVD on August 4, 2024.

View on the EU Vulnerability Database

Affected products

canonical / ubuntu linux
cyrus / imap
debian / debian linux
fedoraproject / fedora
fedoraproject / fedora
redhat / enterprise linux
redhat / enterprise linux eus
redhat / enterprise linux eus
redhat / enterprise linux eus
redhat / enterprise linux server aus
redhat / enterprise linux server aus
redhat / enterprise linux server tus
redhat / enterprise linux server tus

Certified products that may be affected

25 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Red Hat Enterprise Linux 8 NSS Cryptographic Module - Red Hat, Inc. - FIPS 140 5513 - active
Red Hat Enterprise Linux 8 Kernel Cryptographic API - Red Hat, LLC - FIPS 140 5461 - active
Red Hat Enterprise Linux 8 Kernel Cryptographic API - Red Hat, Inc. - FIPS 140 5089 - active
Red Hat Enterprise Linux 8 OpenSSL Cryptographic Module - Red Hat®, Inc. - FIPS 140 4642 - historical
Red Hat Enterprise Linux 8 NSS Cryptographic Module - Red Hat®, Inc. - FIPS 140 4458 - historical

See all 25 in the Security Certifications Explorer.

References

https://access.redhat.com/errata/RHSA-2019:1771(Third 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/9(Mailing List, Third Party Advisory)
https://usn.ubuntu.com/4566-1/(Third Party Advisory)
https://www.cyrusimap.org/imap/download/release-notes/2.5/index.html(Release Notes, Vendor Advisory)
https://www.cyrusimap.org/imap/download/release-notes/2.5/x/2.5.13.html(Release Notes, Vendor Advisory)
https://www.cyrusimap.org/imap/download/release-notes/3.0/index.html(Release Notes, Vendor Advisory)
https://www.cyrusimap.org/imap/download/release-notes/3.0/x/3.0.10.html(Release Notes, Vendor Advisory)
https://www.debian.org/security/2019/dsa-4458(Third Party Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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