--- id: CVE-2020-36226 title: >- A flaw was discovered in OpenLDAP before 2.4.57 leading to a memch->bv_len miscalculation and slapd crash in the saslAuthzTo processing, resulting in denial of service. summary: >- A flaw was discovered in OpenLDAP before 2.4.57 leading to a memch->bv_len miscalculation and slapd crash in the saslAuthzTo processing, resulting in denial of service. severity: high cvss: 7.5 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H' vendor: openldap product: openldap affected: - openldap < 2.4.57 - debian_linux = 9.0 - debian_linux = 10.0 - 'mac_os_x >= 10.14.0, < 10.14.6' - mac_os_x = 10.14.6 - 'macos >= 11.1, < 11.4' patched: - openldap 2.4.57 - mac_os_x 10.14.6 - macos 11.4 published: '2021-01-26' updated: '2026-10-14' sourceUpdated: '2026-10-14T10:17:36.877' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2020-36226' references: - url: 'http://seclists.org/fulldisclosure/2021/May/64' label: cve@mitre.org - url: 'http://seclists.org/fulldisclosure/2021/May/65' label: cve@mitre.org - url: 'http://seclists.org/fulldisclosure/2021/May/70' label: cve@mitre.org - url: 'https://bugs.openldap.org/show_bug.cgi?id=9413' label: cve@mitre.org - url: >- https://git.openldap.org/openldap/openldap/-/commit/554dff1927176579d652f2fe60c90e9abbad4c65 label: cve@mitre.org - url: >- https://git.openldap.org/openldap/openldap/-/commit/5a2017d4e61a6ddc4dcb4415028e0d08eb6bca26 label: cve@mitre.org - url: >- https://git.openldap.org/openldap/openldap/-/commit/c0b61a9486508e5202aa2e0cfb68c9813731b439 label: cve@mitre.org - url: >- https://git.openldap.org/openldap/openldap/-/commit/d169e7958a3e0dc70f59c8374bf8a59833b7bdd8 label: cve@mitre.org - url: 'https://git.openldap.org/openldap/openldap/-/tags/OPENLDAP_REL_ENG_2_4_57' label: cve@mitre.org - url: >- https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E label: cve@mitre.org - url: >- https://lists.apache.org/thread.html/rc713534b10f9daeee2e0990239fa407e2118e4aa9e88a7041177497c%40%3Cissues.guacamole.apache.org%3E label: cve@mitre.org - url: >- https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E label: cve@mitre.org - url: 'https://lists.debian.org/debian-lts-announce/2021/02/msg00005.html' label: cve@mitre.org - url: 'https://security.netapp.com/advisory/ntap-20210226-0002/' label: cve@mitre.org - url: 'https://support.apple.com/kb/HT212529' label: cve@mitre.org - url: 'https://support.apple.com/kb/HT212530' label: cve@mitre.org - url: 'https://support.apple.com/kb/HT212531' label: cve@mitre.org - url: 'https://www.debian.org/security/2021/dsa-4845' label: cve@mitre.org - url: 'http://seclists.org/fulldisclosure/2021/May/64' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'http://seclists.org/fulldisclosure/2021/May/65' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'http://seclists.org/fulldisclosure/2021/May/70' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://bugs.openldap.org/show_bug.cgi?id=9413' label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://git.openldap.org/openldap/openldap/-/commit/554dff1927176579d652f2fe60c90e9abbad4c65 label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://git.openldap.org/openldap/openldap/-/commit/5a2017d4e61a6ddc4dcb4415028e0d08eb6bca26 label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://git.openldap.org/openldap/openldap/-/commit/c0b61a9486508e5202aa2e0cfb68c9813731b439 label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://git.openldap.org/openldap/openldap/-/commit/d169e7958a3e0dc70f59c8374bf8a59833b7bdd8 label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://git.openldap.org/openldap/openldap/-/tags/OPENLDAP_REL_ENG_2_4_57' label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://lists.apache.org/thread.html/rc713534b10f9daeee2e0990239fa407e2118e4aa9e88a7041177497c%40%3Cissues.guacamole.apache.org%3E label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://lists.debian.org/debian-lts-announce/2021/02/msg00005.html' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://security.netapp.com/advisory/ntap-20210226-0002/' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://support.apple.com/kb/HT212529' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://support.apple.com/kb/HT212530' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://support.apple.com/kb/HT212531' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://www.debian.org/security/2021/dsa-4845' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://cert-portal.siemens.com/productcert/html/ssa-398330.html' label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e tags: - nvd epss: 0.04184 epssPercentile: 0.90711 ingestedAt: '2026-10-14T10:25:41.186Z' --- ## Overview A flaw was discovered in OpenLDAP before 2.4.57 leading to a memch->bv_len miscalculation and slapd crash in the saslAuthzTo processing, resulting in denial of service. ## Affected - `openldap < 2.4.57` - `debian_linux = 9.0` - `debian_linux = 10.0` - `mac_os_x >= 10.14.0, < 10.14.6` - `mac_os_x = 10.14.6` - `macos >= 11.1, < 11.4` ## Remediation Upgrade past the affected range: - `openldap 2.4.57` - `mac_os_x 10.14.6` - `macos 11.4`