What’s Vulnerable › Vulnerabilities

CVE-2019-19906

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 8.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-12-19 · updated 2026-10-14
• Weakness: CWE-193

Description

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 malformed LDAP packet. The OpenLDAP crash is ultimately caused by an off-by-one error in _sasl_add_string in common.c in cyrus-sasl.

Affected products

• Apache Software Foundation Apache BookKeeper: 4.12.1
• Apple iPadOS: 13.6
• Apple Iphone Os: 13.6
• macOS: before 10.13.6; from 10.13.0 before 10.13.6; from 10.15.0 before 10.15.6; 10.14.6, 10.13.6, 10.13.6-security_update_2018-002, 10.13.6-security_update_2018-003, 10.13.6-security_update_2019-001, 10.13.6-security_update_2019-002 (+17) — fixed in 10.13.6, 10.15.6
• Canonical Ubuntu Linux: 12.04, 14.04, 16.04, 18.04, 19.10
• cyrusimap Cyrus-Sasl: before 2.1.28 — fixed in 2.1.28
• Debian Linux: 8.0, 9.0, 10.0
• Fedoraproject Fedora: 31, 32
• Red Hat Enterprise Linux: 5.0, 6.0, 7.0, 8.0
• RedHat Enterprise Linux Eus: 8.4
• RedHat Enterprise Linux For Ibm Z Systems: 8.0
• RedHat Enterprise Linux For Ibm Z Systems Eus: 8.4
• RedHat Enterprise Linux For Power Little Endian: 8.0
• RedHat Enterprise Linux For Power Little Endian Eus: 8.4
• RedHat Enterprise Linux Server Aus: 8.4
• RedHat Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions: 8.4
• RedHat Enterprise Linux Server Tus: 8.4
• RedHat Enterprise Linux Server Update Services For Sap Solutions: 8.4
• Red Hat JBoss Enterprise Web Server: 2.0.0

How to fix

Upgrade to a fixed version: macOS 10.13.6, 10.15.6; cyrusimap Cyrus-Sasl 2.1.28. Check the vendor advisory for mitigations.

References

• http://seclists.org/fulldisclosure/2020/Jul/23
• http://seclists.org/fulldisclosure/2020/Jul/24
• http://www.openwall.com/lists/oss-security/2022/02/23/4
• https://github.com/cyrusimap/cyrus-sasl/issues/587
• https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
• https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
• https://lists.debian.org/debian-lts-announce/2019/12/msg00027.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MW6GZCLECGL2PBNHVNPJIX4RPVRVFR7R/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OB4GSVOJ6ESHQNT5GSV63OX5D4KPSTGT/
• https://seclists.org/bugtraq/2019/Dec/42
• https://support.apple.com/kb/HT211288
• https://support.apple.com/kb/HT211289

Get alerted when CVE-2019-19906 or the next vulnerability affects your stack