What’s Vulnerable › Vulnerabilities
CVE-2020-36221
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 85.0% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2021-01-26 · updated 2026-10-14
- Weakness: CWE-191
Description
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).
Affected products
- macOS: from 10.14.0 before 10.14.6; 10.14.6, 10.14.6-security_update_2019-004, 10.14.6-security_update_2019-005, 10.14.6-security_update_2019-006, 10.14.6-security_update_2019-007, 10.14.6-security_update_2020-001 (+11) — fixed in 10.14.6
- Apple macOS: from 11.1 before 11.4 — fixed in 11.4
- Debian Linux: 9.0, 10.0
- openldap: before 2.4.57 — fixed in 2.4.57
How to fix
Upgrade to a fixed version: macOS 10.14.6; Apple macOS 11.4; openldap 2.4.57. Check the vendor advisory for mitigations.
References
- http://seclists.org/fulldisclosure/2021/May/64
- http://seclists.org/fulldisclosure/2021/May/65
- http://seclists.org/fulldisclosure/2021/May/70
- https://bugs.openldap.org/show_bug.cgi?id=9404
- https://bugs.openldap.org/show_bug.cgi?id=9424
- https://git.openldap.org/openldap/openldap/-/commit/38ac838e4150c626bbfa0082b7e2cf3a2bb4df31
- https://git.openldap.org/openldap/openldap/-/commit/58c1748e81c843c5b6e61648d2a4d1d82b47e842
- https://git.openldap.org/openldap/openldap/-/tags/OPENLDAP_REL_ENG_2_4_57
- 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
- https://security.netapp.com/advisory/ntap-20210226-0002/
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