Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2020-36227

CVE-2020-36227HIGH

n/a n/a — A flaw was discovered in OpenLDAP before 2.4.57 leading to an infinite loop in slapd with the cancel_extop Cancel operation, resulting in…

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  N  N  H    7.5   .7724   99.6     —

AFFECTED
  Product  Versions  Fixed
  n/a      n/a –     —

TIMELINE
  Jan 25  Reserved by mitre
  Jan 25  Published (CNA: mitre)
  Oct 14  ENRICHED — CVE-2020-36227. Received CVSS 7.5 and CPE data from NVD.

CWE-835 · CNA: mitre · CVSS v3.1 · 15 references · NVD status: Modified

Description

A flaw was discovered in OpenLDAP before 2.4.57 leading to an infinite loop in slapd with the cancel_extop Cancel operation, resulting in denial of service.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
January 25, 2021	Reserved	Reserved by mitre
January 25, 2021	Published	Published (CNA: mitre)
October 14, 2026	ENRICHED	ENRICHED — CVE-2020-36227. Received CVSS 7.5 and CPE data from NVD.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
n/a	n/a	—	n/a	—

Weaknesses

CWE-835

References (15)

http://seclists.org/fulldisclosure/2021/May/64 [Mailing List, Third Party Advisory]
http://seclists.org/fulldisclosure/2021/May/65 [Mailing List, Third Party Advisory]
http://seclists.org/fulldisclosure/2021/May/70 [Mailing List, Third Party Advisory]
https://bugs.openldap.org/show_bug.cgi?id=9428 [Issue Tracking, Vendor Advisory]
https://cert-portal.siemens.com/productcert/html/ssa-398330.html
https://git.openldap.org/openldap/openldap/-/commit/9d0e8485f3113505743baabf1167e01e4558ccf5 [Patch, Vendor Advisory]
https://git.openldap.org/openldap/openldap/-/tags/OPENLDAP_REL_ENG_2_4_57 [Release Notes, Vendor Advisory]
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 [Mailing List, Third Party Advisory]
https://security.netapp.com/advisory/ntap-20210226-0002/ [Third Party Advisory]
https://support.apple.com/kb/HT212529 [Third Party Advisory]
https://support.apple.com/kb/HT212530 [Third Party Advisory]
https://support.apple.com/kb/HT212531 [Third Party Advisory]
https://www.debian.org/security/2021/dsa-4845 [Third Party Advisory]

Authoritative record: CVE-2020-36227 at cve.org

Weaknesses: CWE-835

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2020-36227 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.