CVE-2020-36228: Apple macOS

High severity, CVSS 7.5. EPSS: 85% chance of exploitation in the next 30 days.

An integer underflow was discovered in OpenLDAP before 2.4.57 leading to a slapd crash in the Certificate List Exact Assertion processing, resulting in denial of service.

Affected products

• Apple macOS: from 11.1, before 11.4 (fixed in 11.4)
• Debian Debian Linux: version 9.0 only; version 10.0 only
• Openldap Openldap: before 2.4.57 (fixed in 2.4.57)

Published 2021-01-26. Last modified 2026-06-17.