{"cve":"CVE-2020-36221","nvd":{"published":"2021-01-26T18:15:56.693","modified":"2026-10-14T10:17:35.657","status":"Modified","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).","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-191"],"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"],"products":["apple:mac_os_x","apple:macos","debian:debian_linux","openldap:openldap"],"source":"nvd","synced_at":"2026-10-19T21:14:10.479542811+00:00"},"epss":{"cve":"CVE-2020-36221","score":0.84994,"percentile":0.9971,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}