CVE-2021-27212
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, resulti…
Published Feb 14, 2021 · updated Oct 14, 2026 · openldap openldap
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.
Code
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No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Feb 14, 2021 · NIST NVD
Detected
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.
Oct 14, 2026 · NIST NVD
Updated
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.
Affected
- cpe debian/debian linux10.0
- cpe debian/debian linux9.0
- cpe openldap/openldapversion unspecified
- cpe openldap/openldap2.5.0
- cpe openldap/openldap2.5.1
Sources
- CVE.orgVulnerability recordCVE-2021-27212
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2021-27212
30-day exploitation probability 66.1%
first.org - NIST NVDVulnerability recordCVE-2021-27212
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.
nvd.nist.gov