CVE-2019-11356
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (7.62%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 7.62% probability · 95th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-787
- Affected
- cyrus/imap · fedoraproject/fedora · debian/debian linux · canonical/ubuntu linux · redhat/enterprise linux · redhat/enterprise linux eus · redhat/enterprise linux server aus · redhat/enterprise linux server tus
- Source
- cve@mitre.org
EPSS 7.6% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.