CVE catalog

CVE-2020-25710

openldap: CVE-2020-25710

Severity: High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: Nov 2, 2020, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 2.73% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	openldap	sid	`2.6.14+dfsg-2`	fixed
Debian	openldap	forky	`2.6.14+dfsg-2`	fixed
Debian	openldap	trixie	`2.6.10+dfsg-1`	fixed
Debian	openldap	bookworm	`2.5.13+dfsg-5`	fixed
Cpe	openldap	Not reported	`2.4.56`	fixed
Cpe	jboss_core_services	Not reported	Not reported	unknown
Cpe	jboss_enterprise_application_platform	Not reported	Not reported	unknown
Cpe	jboss_enterprise_web_server	Not reported	Not reported	unknown
Cpe	enterprise_linux	Not reported	Not reported	unknown
Cpe	debian_linux	Not reported	Not reported	unknown
Cpe	fedora	Not reported	Not reported	unknown
Alpine	openldap	3.10	`2.4.48-r2`	fixed
Alpine	openldap	3.11	`2.4.48-r3`	fixed
Alpine	openldap	3.12	`2.4.50-r1`	fixed
Alpine	openldap	3.13	`2.4.56-r0`	fixed
Alpine	openldap	3.14	`2.4.56-r0`	fixed
Alpine	openldap	3.15	`2.4.56-r0`	fixed
Alpine	openldap	3.16	`2.4.56-r0`	fixed
Alpine	openldap	3.17	`2.4.56-r0`	fixed
Alpine	openldap	3.18	`2.4.56-r0`	fixed
Alpine	openldap	3.19	`2.4.56-r0`	fixed
Alpine	openldap	3.20	`2.4.56-r0`	fixed
Alpine	openldap	3.21	`2.4.56-r0`	fixed
Alpine	openldap	3.22	`2.4.56-r0`	fixed
Alpine	openldap	3.23	`2.4.56-r0`	fixed
Alpine	openldap	3.24	`2.4.56-r0`	fixed
Alpine	openldap	3.9	`2.4.48-r2`	fixed
Ubuntu	openldap	pro	`2.4.31-1+nmu2ubuntu3`	vulnerable
Ubuntu	openldap	pro	`2.4.31-1+nmu2ubuntu4`	vulnerable
Ubuntu	openldap	pro	`2.4.31-1+nmu2ubuntu5`	vulnerable
Ubuntu	openldap	pro	`2.4.31-1+nmu2ubuntu8`	vulnerable
Ubuntu	openldap	pro	`2.4.31-1+nmu2ubuntu8.1`	vulnerable
Ubuntu	openldap	pro	`2.4.31-1+nmu2ubuntu8.2`	vulnerable
Ubuntu	openldap	pro	`2.4.31-1+nmu2ubuntu8.3`	vulnerable
Ubuntu	openldap	pro	`2.4.31-1+nmu2ubuntu8.4`	vulnerable
Ubuntu	openldap	pro	`2.4.31-1+nmu2ubuntu8.5`	vulnerable
Ubuntu	openldap	pro	`2.4.31-1+nmu2ubuntu8.5+esm1`	vulnerable
Ubuntu	openldap	pro	`2.4.31-1+nmu2ubuntu8.5+esm2`	vulnerable
Ubuntu	openldap	pro	`2.4.31-1+nmu2ubuntu8.5+esm3`	vulnerable
Ubuntu	openldap	pro	`2.4.31-1+nmu2ubuntu8.5+esm4`	fixed
Ubuntu	openldap	16.04	`2.4.41+dfsg-1ubuntu2`	vulnerable
Ubuntu	openldap	16.04	`2.4.41+dfsg-1ubuntu3`	vulnerable
Ubuntu	openldap	16.04	`2.4.42+dfsg-2ubuntu1`	vulnerable
Ubuntu	openldap	16.04	`2.4.42+dfsg-2ubuntu3`	vulnerable
Ubuntu	openldap	16.04	`2.4.42+dfsg-2ubuntu3.1`	vulnerable
Ubuntu	openldap	16.04	`2.4.42+dfsg-2ubuntu3.2`	vulnerable
Ubuntu	openldap	16.04	`2.4.42+dfsg-2ubuntu3.3`	vulnerable
Ubuntu	openldap	16.04	`2.4.42+dfsg-2ubuntu3.4`	vulnerable
Ubuntu	openldap	16.04	`2.4.42+dfsg-2ubuntu3.5`	vulnerable
Ubuntu	openldap	16.04	`2.4.42+dfsg-2ubuntu3.6`	vulnerable
Ubuntu	openldap	16.04	`2.4.42+dfsg-2ubuntu3.7`	vulnerable
Ubuntu	openldap	16.04	`2.4.42+dfsg-2ubuntu3.8`	vulnerable
Ubuntu	openldap	16.04	`2.4.42+dfsg-2ubuntu3.9`	vulnerable
Ubuntu	openldap	16.04	`2.4.42+dfsg-2ubuntu3.10`	vulnerable
Ubuntu	openldap	16.04	`2.4.42+dfsg-2ubuntu3.11`	fixed
Ubuntu	openldap	18.04	`2.4.45+dfsg-1ubuntu1`	vulnerable
Ubuntu	openldap	18.04	`2.4.45+dfsg-1ubuntu1.1`	vulnerable
Ubuntu	openldap	18.04	`2.4.45+dfsg-1ubuntu1.2`	vulnerable
Ubuntu	openldap	18.04	`2.4.45+dfsg-1ubuntu1.3`	vulnerable
Ubuntu	openldap	18.04	`2.4.45+dfsg-1ubuntu1.4`	vulnerable
Ubuntu	openldap	18.04	`2.4.45+dfsg-1ubuntu1.5`	vulnerable
Ubuntu	openldap	18.04	`2.4.45+dfsg-1ubuntu1.6`	vulnerable
Ubuntu	openldap	18.04	`2.4.45+dfsg-1ubuntu1.7`	vulnerable
Ubuntu	openldap	18.04	`2.4.45+dfsg-1ubuntu1.8`	fixed
Ubuntu	openldap	20.04	`2.4.48+dfsg-1ubuntu1`	vulnerable
Ubuntu	openldap	20.04	`2.4.48+dfsg-1ubuntu2`	vulnerable
Ubuntu	openldap	20.04	`2.4.48+dfsg-1ubuntu3`	vulnerable
Ubuntu	openldap	20.04	`2.4.48+dfsg-1ubuntu4`	vulnerable
Ubuntu	openldap	20.04	`2.4.49+dfsg-1ubuntu1`	vulnerable
Ubuntu	openldap	20.04	`2.4.49+dfsg-2ubuntu1`	vulnerable
Ubuntu	openldap	20.04	`2.4.49+dfsg-2ubuntu1.2`	vulnerable
Ubuntu	openldap	20.04	`2.4.49+dfsg-2ubuntu1.3`	vulnerable
Ubuntu	openldap	20.04	`2.4.49+dfsg-2ubuntu1.4`	vulnerable
Ubuntu	openldap	20.04	`2.4.49+dfsg-2ubuntu1.5`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	openldap	source	sid	`2.4.56+dfsg-1`	not yet assigned	Not reported	Not reported
Debian	openldap	source	forky	`2.4.56+dfsg-1`	not yet assigned	Not reported	Not reported
Debian	openldap	source	trixie	`2.4.56+dfsg-1`	not yet assigned	Not reported	Not reported
Debian	openldap	source	bookworm	`2.4.56+dfsg-1`	not yet assigned	Not reported	Not reported
Cpe	openldap	cpe	Not reported	`2.4.56`	Not reported	NVD-CVE-2020-25710	Not reported
Alpine	openldap	apk	3.10	`2.4.48-r2`	Not reported	ALPINE-CVE-2020-25710	Not reported
Alpine	openldap	apk	3.11	`2.4.48-r3`	Not reported	ALPINE-CVE-2020-25710	Not reported
Alpine	openldap	apk	3.12	`2.4.50-r1`	Not reported	ALPINE-CVE-2020-25710	Not reported
Alpine	openldap	apk	3.13	`2.4.56-r0`	Not reported	ALPINE-CVE-2020-25710	Not reported
Alpine	openldap	apk	3.14	`2.4.56-r0`	Not reported	ALPINE-CVE-2020-25710	Not reported
Alpine	openldap	apk	3.15	`2.4.56-r0`	Not reported	ALPINE-CVE-2020-25710	Not reported
Alpine	openldap	apk	3.16	`2.4.56-r0`	Not reported	ALPINE-CVE-2020-25710	Not reported
Alpine	openldap	apk	3.17	`2.4.56-r0`	Not reported	ALPINE-CVE-2020-25710	Not reported
Alpine	openldap	apk	3.18	`2.4.56-r0`	Not reported	ALPINE-CVE-2020-25710	Not reported
Alpine	openldap	apk	3.19	`2.4.56-r0`	Not reported	ALPINE-CVE-2020-25710	Not reported
Alpine	openldap	apk	3.20	`2.4.56-r0`	Not reported	ALPINE-CVE-2020-25710	Not reported
Alpine	openldap	apk	3.21	`2.4.56-r0`	Not reported	ALPINE-CVE-2020-25710	Not reported
Alpine	openldap	apk	3.22	`2.4.56-r0`	Not reported	ALPINE-CVE-2020-25710	Not reported
Alpine	openldap	apk	3.23	`2.4.56-r0`	Not reported	ALPINE-CVE-2020-25710	Not reported
Alpine	openldap	apk	3.24	`2.4.56-r0`	Not reported	ALPINE-CVE-2020-25710	Not reported
Alpine	openldap	apk	3.9	`2.4.48-r2`	Not reported	ALPINE-CVE-2020-25710	Not reported
Ubuntu	openldap	deb	pro	`2.4.31-1+nmu2ubuntu8.5+esm4`	Not reported	UBUNTU-CVE-2020-25710	Not reported
Ubuntu	openldap	deb	16.04	`2.4.42+dfsg-2ubuntu3.11`	Not reported	UBUNTU-CVE-2020-25710	Not reported
Ubuntu	openldap	deb	18.04	`2.4.45+dfsg-1ubuntu1.8`	Not reported	UBUNTU-CVE-2020-25710	Not reported
Ubuntu	openldap	deb	20.04	`2.4.49+dfsg-2ubuntu1.5`	Not reported	UBUNTU-CVE-2020-25710	Not reported

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[ldap-utils]Unknown
Source package: [openldap]
Details (2)
- 2.5.13+dfsg-5 · amd64 · bookworm
  Fixed · Fixed: 2.4.56+dfsg-1
  dsa · openldap · debian · bookworm
- 2.5.13+dfsg-5 · arm64 · bookworm
  Fixed · Fixed: 2.4.56+dfsg-1
  dsa · openldap · debian · bookworm
[libldap-2.5-0]Unknown
Source package: [openldap]
Details (2)
- 2.5.13+dfsg-5 · amd64 · bookworm
  Fixed · Fixed: 2.4.56+dfsg-1
  dsa · openldap · debian · bookworm
- 2.5.13+dfsg-5 · arm64 · bookworm
  Fixed · Fixed: 2.4.56+dfsg-1
  dsa · openldap · debian · bookworm
[libldap2-dev]Unknown
Source package: [openldap]
Details (2)
- 2.5.13+dfsg-5 · all · bookworm
  Fixed · Fixed: 2.4.56+dfsg-1
  dsa · openldap · debian · bookworm
- 2.5.13+dfsg-5 · all · bookworm
  Fixed · Fixed: 2.4.56+dfsg-1
  dsa · openldap · debian · bookworm
[libldap-common]Unknown
Source package: [openldap]
Details (2)
- 2.5.13+dfsg-5 · all · bookworm
  Fixed · Fixed: 2.4.56+dfsg-1
  dsa · openldap · debian · bookworm
- 2.5.13+dfsg-5 · all · bookworm
  Fixed · Fixed: 2.4.56+dfsg-1
  dsa · openldap · debian · bookworm
[libldap-dev]Unknown
Source package: [openldap]
Details (2)
- 2.5.13+dfsg-5 · amd64 · bookworm
  Fixed · Fixed: 2.4.56+dfsg-1
  dsa · openldap · debian · bookworm
- 2.5.13+dfsg-5 · arm64 · bookworm
  Fixed · Fixed: 2.4.56+dfsg-1
  dsa · openldap · debian · bookworm
[slapd]Unknown
Source package: [openldap]
Details (2)
- 2.5.13+dfsg-5 · amd64 · bookworm
  Fixed · Fixed: 2.4.56+dfsg-1
  dsa · openldap · debian · bookworm
- 2.5.13+dfsg-5 · arm64 · bookworm
  Fixed · Fixed: 2.4.56+dfsg-1
  dsa · openldap · debian · bookworm
[slapd-contrib]Unknown
Source package: [openldap]
Details (2)
- 2.5.13+dfsg-5 · amd64 · bookworm
  Fixed · Fixed: 2.4.56+dfsg-1
  dsa · openldap · debian · bookworm
- 2.5.13+dfsg-5 · arm64 · bookworm
  Fixed · Fixed: 2.4.56+dfsg-1
  dsa · openldap · debian · bookworm
[slapd-smbk5pwd]Unknown
Source package: [openldap]
Details (2)
- 2.5.13+dfsg-5 · all · bookworm
  Fixed · Fixed: 2.4.56+dfsg-1
  dsa · openldap · debian · bookworm
- 2.5.13+dfsg-5 · all · bookworm
  Fixed · Fixed: 2.4.56+dfsg-1
  dsa · openldap · debian · bookworm
[slapi-dev]Unknown
Source package: [openldap]
Details (2)
- 2.5.13+dfsg-5 · amd64 · bookworm
  Fixed · Fixed: 2.4.56+dfsg-1
  dsa · openldap · debian · bookworm
- 2.5.13+dfsg-5 · arm64 · bookworm
  Fixed · Fixed: 2.4.56+dfsg-1
  dsa · openldap · debian · bookworm

Observed: Oct 23, 2026, 5:49:52 PM UTC

References

[CISA cybersecurity advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]