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).

CVSS 3.1

7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

85% chance of exploitation in the next 30 days; higher than 99% of CVEs (scores of 2026-10-25)

CWE

CWE-191

Published

2021-01-26

Modified

2026-10-14

Record from

the NVD, synced 2026-10-19

Affected

• apple:mac_os_x
• apple:macos
• debian:debian_linux
• openldap:openldap

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

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