cyrus-sasl (aka Cyrus SASL) 2.1.27 has an out-of-bounds write leading to unauthenticated remote denial-of-service in OpenLDAP via a malform…

Description

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Advisories 18

• ALSA-2020:4497 Moderate: cyrus-sasl security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
• RHSA-2020:4497 Red Hat Security Advisory: cyrus-sasl security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 15, 2026
• SSA-398330 SSA-398330: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP >= V3.1.0 and < V3.1.5 Siemens ProductCERT · Oct 13, 2026
• WID-SEC-2022-0432 Xerox FreeFlow Print Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 11, 2026
• WID-SEC-2022-0302 Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen Ausführen von beliebigem Programmcode mit Administratorrechten BSI CERT-Bund (WID) · Oct 11, 2026
• WID-SEC-2025-0227 IBM QRadar SIEM: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 11, 2026
• USN-4256-1 cyrus-sasl2 vulnerability Ubuntu Security Notices (USN) · Jun 29, 2026
• DSA-4591-1 cyrus-sasl2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
• DLA-2044-1 cyrus-sasl2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
• RLSA-2020:4497 Moderate: cyrus-sasl security, bug fix, and enhancement update Rocky Linux Security Advisories · Feb 5, 2026
• SUSE-SU-2022:3549-1 Security update for cyrus-sasl SUSE / openSUSE Security Updates · Feb 4, 2026
• openSUSE-SU-2024:10709-1 cyrus-sasl-2.1.27-5.7 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
• SUSE-SU-2020:3939-1 Security update for cyrus-sasl SUSE / openSUSE Security Updates · Feb 4, 2026
• SUSE-SU-2020:14579-1 Security update for cyrus-sasl SUSE / openSUSE Security Updates · Feb 4, 2026
• WID-SEC-2022-1335 Xerox FreeFlow Print Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 6, 2025
• ICSA-23-348-10 Siemens SIMATIC S7-1500 CISA ICS & IT advisories · Aug 12, 2025
• VDE-2022-046 PHOENIX CONTACT: Multiple Linux component vulnerabilities in PLCnext Firmware CERT@VDE · May 22, 2025
• ELSA-2020-4497 Moderate: cyrus-sasl security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 10, 2020

References

• https://github.com/cyrusimap/cyrus-sasl/issues/587
• https://www.openldap.org/its/index.cgi/Incoming?id=9123
• [debian-lts-announce] 20191220 [SECURITY] [DLA 2044-1] cyrus-sasl2 security update mailing-list
• DSA-4591 vendor-advisory
• 20191225 [SECURITY] [DSA 4591-1] cyrus-sasl2 security update mailing-list
• USN-4256-1 vendor-advisory
• FEDORA-2020-51d591d035 vendor-advisory
• FEDORA-2020-bf829f9a84 vendor-advisory
• https://support.apple.com/kb/HT211288
• https://support.apple.com/kb/HT211289
• 20200717 APPLE-SA-2020-07-15-2 macOS Catalina 10.15.6, Security Update 2020-004 Mojave, Security Update 2020-004 High Sierra mailing-list
• 20200717 APPLE-SA-2020-07-15-1 iOS 13.6 and iPadOS 13.6 mailing-list
• [bookkeeper-issues] 20210628 [GitHub] [bookkeeper] padma81 opened a new issue #2746: Security Vulnerabilities in CentOS 7 image, Upgrade image to CentOS 8 mailing-list
• [bookkeeper-issues] 20210629 [GitHub] [bookkeeper] padma81 opened a new issue #2746: Security Vulnerabilities in CentOS 7 image, Upgrade image to CentOS 8 mailing-list
• [oss-security] 20220223 Fwd: Cyrus-SASL 2.1.28 released [fixes CVE-2022-24407 & CVE-2019-19906] mailing-list