CVE catalog

CVE-2021-27212

openldap: CVE-2021-27212

Severity: High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: Feb 14, 2021, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 66.11% · Oct 25, 2026

In OpenLDAP through 2.4.57 and 2.5.x through 2.5.1alpha, an assertion failure in slapd can occur in the issuerAndThisUpdateCheck function via a crafted packet, resulting in a denial of service (daemon exit) via a short timestamp. This is related to schema_init.c and checkTime.

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	Not reported	unknown
Cpe	debian_linux	Not reported	Not reported	unknown
Alpine	openldap	3.12	`2.4.50-r2`	fixed
Alpine	openldap	3.13	`2.4.57-r1`	fixed
Alpine	openldap	3.14	`2.4.57-r1`	fixed
Alpine	openldap	3.15	`2.4.57-r1`	fixed
Alpine	openldap	3.16	`2.4.57-r1`	fixed
Alpine	openldap	3.17	`2.4.57-r1`	fixed
Alpine	openldap	3.18	`2.4.57-r1`	fixed
Alpine	openldap	3.19	`2.4.57-r1`	fixed
Alpine	openldap	3.20	`2.4.57-r1`	fixed
Alpine	openldap	3.21	`2.4.57-r1`	fixed
Alpine	openldap	3.22	`2.4.57-r1`	fixed
Alpine	openldap	3.23	`2.4.57-r1`	fixed
Alpine	openldap	3.24	`2.4.57-r1`	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`	vulnerable
Ubuntu	openldap	pro	`2.4.31-1+nmu2ubuntu8.5+esm5`	vulnerable
Ubuntu	openldap	pro	`2.4.31-1+nmu2ubuntu8.5+esm6`	vulnerable
Ubuntu	openldap	pro	`2.4.31-1+nmu2ubuntu8.5+esm7`	vulnerable
Ubuntu	openldap	pro	`2.4.31-1+nmu2ubuntu8.5+esm8`	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`	vulnerable
Ubuntu	openldap	16.04	`2.4.42+dfsg-2ubuntu3.12`	vulnerable
Ubuntu	openldap	16.04	`2.4.42+dfsg-2ubuntu3.13`	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`	vulnerable
Ubuntu	openldap	18.04	`2.4.45+dfsg-1ubuntu1.9`	vulnerable
Ubuntu	openldap	18.04	`2.4.45+dfsg-1ubuntu1.10`	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`	vulnerable
Ubuntu	openldap	20.04	`2.4.49+dfsg-2ubuntu1.6`	vulnerable
Ubuntu	openldap	20.04	`2.4.49+dfsg-2ubuntu1.7`	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`	vulnerable
Ubuntu	openldap	16.04	`2.4.42+dfsg-2ubuntu3.12`	vulnerable
Ubuntu	openldap	16.04	`2.4.42+dfsg-2ubuntu3.13`	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`	vulnerable
Ubuntu	openldap	18.04	`2.4.45+dfsg-1ubuntu1.9`	vulnerable
Ubuntu	openldap	18.04	`2.4.45+dfsg-1ubuntu1.10`	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`	vulnerable
Ubuntu	openldap	20.04	`2.4.49+dfsg-2ubuntu1.6`	vulnerable
Ubuntu	openldap	20.04	`2.4.49+dfsg-2ubuntu1.7`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	openldap	source	sid	`2.4.57+dfsg-2`	not yet assigned	Not reported	Not reported
Debian	openldap	source	forky	`2.4.57+dfsg-2`	not yet assigned	Not reported	Not reported
Debian	openldap	source	trixie	`2.4.57+dfsg-2`	not yet assigned	Not reported	Not reported
Debian	openldap	source	bookworm	`2.4.57+dfsg-2`	not yet assigned	Not reported	Not reported
Alpine	openldap	apk	3.12	`2.4.50-r2`	Not reported	ALPINE-CVE-2021-27212	Not reported
Alpine	openldap	apk	3.13	`2.4.57-r1`	Not reported	ALPINE-CVE-2021-27212	Not reported
Alpine	openldap	apk	3.14	`2.4.57-r1`	Not reported	ALPINE-CVE-2021-27212	Not reported
Alpine	openldap	apk	3.15	`2.4.57-r1`	Not reported	ALPINE-CVE-2021-27212	Not reported
Alpine	openldap	apk	3.16	`2.4.57-r1`	Not reported	ALPINE-CVE-2021-27212	Not reported
Alpine	openldap	apk	3.17	`2.4.57-r1`	Not reported	ALPINE-CVE-2021-27212	Not reported
Alpine	openldap	apk	3.18	`2.4.57-r1`	Not reported	ALPINE-CVE-2021-27212	Not reported
Alpine	openldap	apk	3.19	`2.4.57-r1`	Not reported	ALPINE-CVE-2021-27212	Not reported
Alpine	openldap	apk	3.20	`2.4.57-r1`	Not reported	ALPINE-CVE-2021-27212	Not reported
Alpine	openldap	apk	3.21	`2.4.57-r1`	Not reported	ALPINE-CVE-2021-27212	Not reported
Alpine	openldap	apk	3.22	`2.4.57-r1`	Not reported	ALPINE-CVE-2021-27212	Not reported
Alpine	openldap	apk	3.23	`2.4.57-r1`	Not reported	ALPINE-CVE-2021-27212	Not reported
Alpine	openldap	apk	3.24	`2.4.57-r1`	Not reported	ALPINE-CVE-2021-27212	Not reported
Ubuntu	openldap	deb	pro	`2.4.31-1+nmu2ubuntu8.5+esm8`	Not reported	UBUNTU-CVE-2021-27212	Not reported
Ubuntu	openldap	deb	16.04	`2.4.42+dfsg-2ubuntu3.13`	Not reported	UBUNTU-CVE-2021-27212	Not reported
Ubuntu	openldap	deb	18.04	`2.4.45+dfsg-1ubuntu1.10`	Not reported	UBUNTU-CVE-2021-27212	Not reported
Ubuntu	openldap	deb	20.04	`2.4.49+dfsg-2ubuntu1.7`	Not reported	UBUNTU-CVE-2021-27212	Not reported
Ubuntu	openldap	deb	16.04	`2.4.42+dfsg-2ubuntu3.13`	Not reported	USN-4744-1	Not reported
Ubuntu	openldap	deb	18.04	`2.4.45+dfsg-1ubuntu1.10`	Not reported	USN-4744-1	Not reported
Ubuntu	openldap	deb	20.04	`2.4.49+dfsg-2ubuntu1.7`	Not reported	USN-4744-1	Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[ldap-utils]Fixed
Source package: [openldap]
Details (2)
- 2.5.13+dfsg-5 · amd64 · bookworm
  Fixed · Fixed: 2.4.57+dfsg-2
  dsa · openldap · debian · bookworm
- 2.5.13+dfsg-5 · arm64 · bookworm
  Fixed · Fixed: 2.4.57+dfsg-2
  dsa · openldap · debian · bookworm
[libldap-2.5-0]Fixed
Source package: [openldap]
Details (2)
- 2.5.13+dfsg-5 · amd64 · bookworm
  Fixed · Fixed: 2.4.57+dfsg-2
  dsa · openldap · debian · bookworm
- 2.5.13+dfsg-5 · arm64 · bookworm
  Fixed · Fixed: 2.4.57+dfsg-2
  dsa · openldap · debian · bookworm
[libldap2-dev]Fixed
Source package: [openldap]
Details (2)
- 2.5.13+dfsg-5 · all · bookworm
  Fixed · Fixed: 2.4.57+dfsg-2
  dsa · openldap · debian · bookworm
- 2.5.13+dfsg-5 · all · bookworm
  Fixed · Fixed: 2.4.57+dfsg-2
  dsa · openldap · debian · bookworm
[libldap-common]Fixed
Source package: [openldap]
Details (2)
- 2.5.13+dfsg-5 · all · bookworm
  Fixed · Fixed: 2.4.57+dfsg-2
  dsa · openldap · debian · bookworm
- 2.5.13+dfsg-5 · all · bookworm
  Fixed · Fixed: 2.4.57+dfsg-2
  dsa · openldap · debian · bookworm
[libldap-dev]Fixed
Source package: [openldap]
Details (2)
- 2.5.13+dfsg-5 · amd64 · bookworm
  Fixed · Fixed: 2.4.57+dfsg-2
  dsa · openldap · debian · bookworm
- 2.5.13+dfsg-5 · arm64 · bookworm
  Fixed · Fixed: 2.4.57+dfsg-2
  dsa · openldap · debian · bookworm
[slapd]Fixed
Source package: [openldap]
Details (2)
- 2.5.13+dfsg-5 · amd64 · bookworm
  Fixed · Fixed: 2.4.57+dfsg-2
  dsa · openldap · debian · bookworm
- 2.5.13+dfsg-5 · arm64 · bookworm
  Fixed · Fixed: 2.4.57+dfsg-2
  dsa · openldap · debian · bookworm
[slapd-contrib]Fixed
Source package: [openldap]
Details (2)
- 2.5.13+dfsg-5 · amd64 · bookworm
  Fixed · Fixed: 2.4.57+dfsg-2
  dsa · openldap · debian · bookworm
- 2.5.13+dfsg-5 · arm64 · bookworm
  Fixed · Fixed: 2.4.57+dfsg-2
  dsa · openldap · debian · bookworm
[slapd-smbk5pwd]Fixed
Source package: [openldap]
Details (2)
- 2.5.13+dfsg-5 · all · bookworm
  Fixed · Fixed: 2.4.57+dfsg-2
  dsa · openldap · debian · bookworm
- 2.5.13+dfsg-5 · all · bookworm
  Fixed · Fixed: 2.4.57+dfsg-2
  dsa · openldap · debian · bookworm
[slapi-dev]Fixed
Source package: [openldap]
Details (2)
- 2.5.13+dfsg-5 · amd64 · bookworm
  Fixed · Fixed: 2.4.57+dfsg-2
  dsa · openldap · debian · bookworm
- 2.5.13+dfsg-5 · arm64 · bookworm
  Fixed · Fixed: 2.4.57+dfsg-2
  dsa · openldap · debian · bookworm

Observed: Oct 23, 2026, 5:55:20 PM UTC

References

[CERT-Bund public advisories] · [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]