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-2020-25710

CVE-2020-25710HIGH

n/a openldap — A flaw was found in OpenLDAP in versions before 2.4.56.

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  N  N  H    7.5   .0273   85.8     —

AFFECTED
  Product   Versions           Fixed
  openldap  openldap 2.4.56 –  —

TIMELINE
  Sep 16  Reserved by redhat
  May 28  Published (CNA: redhat)
  Oct 14  ENRICHED — CVE-2020-25710 (openldap). Received CVSS 7.5 and CPE data from NVD.

CWE-617 · CNA: redhat · CVSS v3.1 · 8 references · NVD status: Modified

Description

A flaw was found in OpenLDAP in versions before 2.4.56. This flaw allows an attacker who sends a malicious packet processed by OpenLDAP to force a failed assertion in csnNormalize23(). The highest threat from this vulnerability is to system availability.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
September 16, 2020	Reserved	Reserved by redhat
May 28, 2021	Published	Published (CNA: redhat)
October 14, 2026	ENRICHED	ENRICHED — CVE-2020-25710 (openldap). 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	openldap	—	openldap 2.4.56	—

Weaknesses

CWE-617

References (8)

https://bugzilla.redhat.com/show_bug.cgi?id=1899678 [Issue Tracking, Patch, Third Party Advisory]
https://cert-portal.siemens.com/productcert/html/ssa-398330.html
https://git.openldap.org/openldap/openldap/-/commit/ab3915154e69920d480205b4bf5ccb2b391a0a1f#a2feb6ed0257c21c6672793ee2f94eaadc10c72c [Patch, 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/2020/12/msg00008.html [Mailing List, Third Party Advisory]
https://security.netapp.com/advisory/ntap-20210716-0003/ [Third Party Advisory]
https://www.debian.org/security/2020/dsa-4792 [Third Party Advisory]

Authoritative record: CVE-2020-25710 at cve.org

Weaknesses: CWE-617

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2020-25710 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.