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Vulnerability record · CVE-2019-19906 · published 19 December 2019

CVE-2019-19906: Cyrusimap cyrus-sasl out-of-bounds write vulnerability

CCyrusimap · Cyrus Sasl

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.

7.5 CVSS 3.1 High EPSS 8.0% · top 5.4% CWE-193 · CWE-193CWE-787 · Out-of-bounds write
7.5CVSS 3.1 base score, v2 5.0
8.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
19Affected product versions listed by NVD
30References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

19 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://seclists.org/fulldisclosure/2020/Jul/23 Mailing ListThird Party Advisory
http://seclists.org/fulldisclosure/2020/Jul/24 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2022/02/23/4 Mailing ListPatchRelease NotesThird Party Advisory
https://github.com/cyrusimap/cyrus-sasl/issues/587 PatchThird Party Advisory
https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.ap
https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.ap
https://lists.debian.org/debian-lts-announce/2019/12/msg00027.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MW6GZCLECGL2PBNHVNPJIX4
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OB4GSVOJ6ESHQNT5GSV63OX
https://seclists.org/bugtraq/2019/Dec/42 Mailing ListThird Party Advisory
https://support.apple.com/kb/HT211288 Third Party Advisory
https://support.apple.com/kb/HT211289 Third Party Advisory
https://usn.ubuntu.com/4256-1/ PatchThird Party Advisory
https://www.debian.org/security/2019/dsa-4591 Third Party Advisory
https://www.openldap.org/its/index.cgi/Incoming?id=9123 ExploitThird Party Advisory
http://seclists.org/fulldisclosure/2020/Jul/23 Mailing ListThird Party Advisory
http://seclists.org/fulldisclosure/2020/Jul/24 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2022/02/23/4 Mailing ListPatchRelease NotesThird Party Advisory
https://github.com/cyrusimap/cyrus-sasl/issues/587 PatchThird Party Advisory
https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.ap
https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.ap
https://lists.debian.org/debian-lts-announce/2019/12/msg00027.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MW6GZCLECGL2PBNHVNPJIX4
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OB4GSVOJ6ESHQNT5GSV63OX
https://seclists.org/bugtraq/2019/Dec/42 Mailing ListThird Party Advisory
https://support.apple.com/kb/HT211288 Third Party Advisory
https://support.apple.com/kb/HT211289 Third Party Advisory
https://usn.ubuntu.com/4256-1/ PatchThird Party Advisory
https://www.debian.org/security/2019/dsa-4591 Third Party Advisory
https://www.openldap.org/its/index.cgi/Incoming?id=9123 ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2019-19906), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.