CVE-2021-27212

low

Published — · Modified —

CVSS v3

—

CVSS v2

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VIR risk

2.5

Description

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.

Predictions

Exploit likelihood

20%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2021-27212

vendor Authored 2026-05-27

Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2021-27212.html

OS impact

OS	Version	Status	Fixed in
arch		fixed	`2.4.58-1`
sles		affected
debian	bookworm	fixed	`2.4.57+dfsg-2`
debian	bullseye	fixed	`2.4.57+dfsg-2`
debian	forky	fixed	`2.4.57+dfsg-2`
debian	sid	fixed	`2.4.57+dfsg-2`
debian	trixie	fixed	`2.4.57+dfsg-2`

References

https://www.suse.com/security/cve/CVE-2021-27212.html
https://security-tracker.debian.org/tracker/CVE-2021-27212

Verify integrity in audit chain (admin only). AS-IS.