CVE-2020-36221

openldap: Integer underflow in serialNumberAndIssuerCheck in schema_init.c

Published Jan 25, 2021 CVSS 3.1 · 7.5 High EPSS 85.0% KEV · Not listed
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).

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

Source ID Title
Debian DLA Debian DLA DLA-2544-1 openldap security update
Debian DSA Debian DSA DSA-4845-1 openldap security update
Ubuntu USN Ubuntu USN USN-4724-1 OpenLDAP vulnerabilities
Ubuntu USN Ubuntu USN USN-7698-1 OpenLDAP vulnerabilities
Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Oct 14, 2026, 9:44 AM
Reserved
Jan 25, 2021, 12:00 AM
Status
Modified
Published
Jan 26, 2021, 6:15 PM
Modified
Oct 14, 2026, 10:17 AM
Severity
Moderate
Public date
Jan 26, 2021, 12:00 AM