CVE-2020-36221

An integer underflow was discovered in OpenLDAP before 2.4.57 leading to slapd crashes in the Certificate Exact Assertion processing, resulting in denial of service (schema_init.c serialNumberAndIssuerCheck).

• CWE-191

• http://seclists.org/fulldisclosure/2021/May/64Mailing List, Third Party Advisory
• http://seclists.org/fulldisclosure/2021/May/65Mailing List, Third Party Advisory
• http://seclists.org/fulldisclosure/2021/May/70Mailing List, Third Party Advisory
• https://bugs.openldap.org/show_bug.cgi?id=9404Issue Tracking, Vendor Advisory
• https://bugs.openldap.org/show_bug.cgi?id=9424Issue Tracking, Vendor Advisory
• https://git.openldap.org/openldap/openldap/-/commit/38ac838e4150c626bbfa0082b7e2cf3a2bb4df31Patch, Vendor Advisory
• https://git.openldap.org/openldap/openldap/-/commit/58c1748e81c843c5b6e61648d2a4d1d82b47e842Patch, Vendor Advisory
• https://git.openldap.org/openldap/openldap/-/tags/OPENLDAP_REL_ENG_2_4_57Release 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.htmlMailing List, Third Party Advisory
• https://security.netapp.com/advisory/ntap-20210226-0002/Third Party Advisory
• https://support.apple.com/kb/HT212529Third Party Advisory
• https://support.apple.com/kb/HT212530Third Party Advisory
• https://support.apple.com/kb/HT212531Third Party Advisory
• https://www.debian.org/security/2021/dsa-4845Third Party Advisory
• http://seclists.org/fulldisclosure/2021/May/64Mailing List, Third Party Advisory
• http://seclists.org/fulldisclosure/2021/May/65Mailing List, Third Party Advisory
• http://seclists.org/fulldisclosure/2021/May/70Mailing List, Third Party Advisory
• https://bugs.openldap.org/show_bug.cgi?id=9404Issue Tracking, Vendor Advisory
• https://bugs.openldap.org/show_bug.cgi?id=9424Issue Tracking, Vendor Advisory
• https://git.openldap.org/openldap/openldap/-/commit/38ac838e4150c626bbfa0082b7e2cf3a2bb4df31Patch, Vendor Advisory
• https://git.openldap.org/openldap/openldap/-/commit/58c1748e81c843c5b6e61648d2a4d1d82b47e842Patch, Vendor Advisory
• https://git.openldap.org/openldap/openldap/-/tags/OPENLDAP_REL_ENG_2_4_57Release 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.htmlMailing List, Third Party Advisory
• https://security.netapp.com/advisory/ntap-20210226-0002/Third Party Advisory
• https://support.apple.com/kb/HT212529Third Party Advisory
• https://support.apple.com/kb/HT212530Third Party Advisory
• https://support.apple.com/kb/HT212531Third Party Advisory
• https://www.debian.org/security/2021/dsa-4845Third Party Advisory

Published

Jan 26, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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