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-2020-12243

CVE-2020-12243HIGH

n/a n/a — In filter.c in slapd in OpenLDAP before 2.4.50, LDAP search filters with nested boolean expressions can result in denial of service (daem…

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  N  N  H    7.5   .0472   91.7     —

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

TIMELINE
  Apr 24  Reserved by mitre
  Apr 28  Published (CNA: mitre)
  Oct 14  ENRICHED — CVE-2020-12243. Received CVSS 7.5 and CPE data from NVD.
  Oct 14  EXPLOIT PUBLISHED — CVE-2020-12243. Public exploit reference added.

CWE-674 · CNA: mitre · CVSS v3.1 · 13 references · NVD status: Modified

Description

In filter.c in slapd in OpenLDAP before 2.4.50, LDAP search filters with nested boolean expressions can result in denial of service (daemon crash).

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
April 24, 2020	Reserved	Reserved by mitre
April 28, 2020	Published	Published (CNA: mitre)
October 14, 2026	ENRICHED	ENRICHED — CVE-2020-12243. Received CVSS 7.5 and CPE data from NVD.
October 14, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2020-12243. Public exploit reference added.

Affected

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

Weaknesses

CWE-674

References (13)

http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00016.html [Mailing List, Third Party Advisory]
https://bugs.openldap.org/show_bug.cgi?id=9202 [Exploit, Patch, Vendor Advisory]
https://cert-portal.siemens.com/productcert/html/ssa-398330.html
https://git.openldap.org/openldap/openldap/-/blob/OPENLDAP_REL_ENG_2_4/CHANGES [Release Notes, Vendor Advisory]
https://git.openldap.org/openldap/openldap/-/commit/98464c11df8247d6a11b52e294ba5dd4f0380440 [Patch, Vendor Advisory]
https://lists.debian.org/debian-lts-announce/2020/05/msg00001.html [Mailing List, Third Party Advisory]
https://security.netapp.com/advisory/ntap-20200511-0003/ [Third Party Advisory]
https://support.apple.com/kb/HT211289 [Third Party Advisory]
https://usn.ubuntu.com/4352-1/ [Third Party Advisory]
https://usn.ubuntu.com/4352-2/ [Third Party Advisory]
https://www.debian.org/security/2020/dsa-4666 [Third Party Advisory]
https://www.oracle.com/security-alerts/cpuapr2022.html [Third Party Advisory]
https://www.oracle.com/security-alerts/cpuoct2020.html [Patch, Third Party Advisory]

Authoritative record: CVE-2020-12243 at cve.org

Weaknesses: CWE-674

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2020-12243 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.