A flaw was discovered in OpenLDAP before 2.4.57 leading to an infinite loop in slapd with the cancel_extop Cancel operation, resulting in denial of service.
Fix
Patch, vendor advisory and mitigation references on NVD 6
- https://bugs.openldap.org/show_bug.cgi?id=9428 Issue Tracking, Vendor Advisory
- https://git.openldap.org/openldap/openldap/-/commit/9d0e8485f3113505743baabf1167e01e4558ccf5 Patch, Vendor Advisory
- https://git.openldap.org/openldap/openldap/-/tags/OPENLDAP_REL_ENG_2_4_57 Release Notes, Vendor Advisory
- https://bugs.openldap.org/show_bug.cgi?id=9428 Issue Tracking, Vendor Advisory
- https://git.openldap.org/openldap/openldap/-/commit/9d0e8485f3113505743baabf1167e01e4558ccf5 Patch, Vendor Advisory
- https://git.openldap.org/openldap/openldap/-/tags/OPENLDAP_REL_ENG_2_4_57 Release Notes, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 7.5 · openldap, debian, appleNVD modified 2026-10-14 10:17
Affected (CPE criteria) 4
cpe:2.3:a:openldap:openldap:*:*:*:*:*:*:*:*cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*
References 29
- http://seclists.org/fulldisclosure/2021/May/64 Mailing List, Third Party Advisory
- http://seclists.org/fulldisclosure/2021/May/65 Mailing List, Third Party Advisory
- http://seclists.org/fulldisclosure/2021/May/70 Mailing List, Third Party Advisory
- https://bugs.openldap.org/show_bug.cgi?id=9428 Issue Tracking, Vendor Advisory
- https://git.openldap.org/openldap/openldap/-/commit/9d0e8485f3113505743baabf1167e01e4558ccf5 Patch, Vendor Advisory
- https://git.openldap.org/openldap/openldap/-/tags/OPENLDAP_REL_ENG_2_4_57 Release Notes, Vendor Advisory
- 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/2021/02/msg00005.html Mailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210226-0002/ Third Party Advisory
- https://support.apple.com/kb/HT212529 Third Party Advisory
- https://support.apple.com/kb/HT212530 Third Party Advisory
- https://support.apple.com/kb/HT212531 Third Party Advisory
- https://www.debian.org/security/2021/dsa-4845 Third Party Advisory
- http://seclists.org/fulldisclosure/2021/May/64 Mailing List, Third Party Advisory
- http://seclists.org/fulldisclosure/2021/May/65 Mailing List, Third Party Advisory
- http://seclists.org/fulldisclosure/2021/May/70 Mailing List, Third Party Advisory
- https://bugs.openldap.org/show_bug.cgi?id=9428 Issue Tracking, Vendor Advisory
- https://git.openldap.org/openldap/openldap/-/commit/9d0e8485f3113505743baabf1167e01e4558ccf5 Patch, Vendor Advisory
- https://git.openldap.org/openldap/openldap/-/tags/OPENLDAP_REL_ENG_2_4_57 Release Notes, Vendor Advisory
- 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/2021/02/msg00005.html Mailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210226-0002/ Third Party Advisory
- https://support.apple.com/kb/HT212529 Third Party Advisory
- https://support.apple.com/kb/HT212530 Third Party Advisory
- https://support.apple.com/kb/HT212531 Third Party Advisory
- https://www.debian.org/security/2021/dsa-4845 Third Party Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html