CVE-2021-27212
libldap2: In OpenLDAP through 2.4.57 and 2.5.x through 2.5.1alpha, an assertionfailure in slapd can occur in the issuerAndThisU...
CVE-2021-27212 is fixed in 17 products on 1 platform, first by ldap-utils 2.4.45+dfsg-1ubuntu1.10, released February 13, 2021. It is not reported as exploited. Patch Radar priority: Routine.
Routine
CVSS
n/a
Medium
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.6611
99th percentile
In OpenLDAP through 2.4.57 and 2.5.x through 2.5.1alpha, an assertionfailure in slapd can occur in the issuerAndThisUpdateCheck function via acrafted packet, resulting in a denial of service (daemon exit) via a shorttimestamp. This is related to schema_init.c and checkTime.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| ldap-utils · Ubuntu 18.04.6 LTS (bionic) | 2.4.45+dfsg-1ubuntu1.10 | ldap-utils 2.4.45+dfsg-1ubuntu1.10 | Feb 13, 2021 |
| ldap-utils · Ubuntu 20.04 LTS (focal) | 2.4.49+dfsg-2ubuntu1.7 | ldap-utils 2.4.49+dfsg-2ubuntu1.7 | Feb 13, 2021 |
| ldap-utils · Ubuntu 24.10 (oracular) | 2.4.57+dfsg-2ubuntu1 | ldap-utils 2.4.57+dfsg-2ubuntu1 | Jan 16, 2026 |
| ldap-utils · Ubuntu 25.04 (plucky) | 2.4.57+dfsg-2ubuntu1 | ldap-utils 2.4.57+dfsg-2ubuntu1 | Jan 16, 2026 |
| libldap-2.4-2 · Ubuntu 18.04.6 LTS (bionic) | 2.4.45+dfsg-1ubuntu1.10 | libldap-2.4-2 2.4.45+dfsg-1ubuntu1.10 | Feb 13, 2021 |
| libldap-2.4-2 · Ubuntu 20.04 LTS (focal) | 2.4.49+dfsg-2ubuntu1.7 | libldap-2.4-2 2.4.49+dfsg-2ubuntu1.7 | Feb 13, 2021 |
| libldap-common · Ubuntu 18.04.6 LTS (bionic) | 2.4.45+dfsg-1ubuntu1.10 | libldap-common 2.4.45+dfsg-1ubuntu1.10 | Feb 13, 2021 |
| libldap-common · Ubuntu 20.04 LTS (focal) | 2.4.49+dfsg-2ubuntu1.7 | libldap-common 2.4.49+dfsg-2ubuntu1.7 | Feb 13, 2021 |
| libldap-common · Ubuntu 24.10 (oracular) | 2.4.57+dfsg-2ubuntu1 | libldap-common 2.4.57+dfsg-2ubuntu1 | Jan 16, 2026 |
| libldap-common · Ubuntu 25.04 (plucky) | 2.4.57+dfsg-2ubuntu1 | libldap-common 2.4.57+dfsg-2ubuntu1 | Jan 16, 2026 |
| libldap2 · Ubuntu 24.10 (oracular) | 2.4.57+dfsg-2ubuntu1 | libldap2 2.4.57+dfsg-2ubuntu1 | Jan 16, 2026 |
| libldap2 · Ubuntu 25.04 (plucky) | 2.4.57+dfsg-2ubuntu1 | libldap2 2.4.57+dfsg-2ubuntu1 | Jan 16, 2026 |
| openldap · amzn 2023 | 2.4.57-6.amzn2023.0.4 | ALAS2023-2023-177 | Apr 27, 2023 |
| openldap-clients · amzn 2023 | 2.4.57-6.amzn2023.0.4 | ALAS2023-2023-177 | Apr 27, 2023 |
| openldap-clients-debuginfo · amzn 2023 | 2.4.57-6.amzn2023.0.4 | ALAS2023-2023-177 | Apr 27, 2023 |
| openldap-compat · amzn 2023 | 2.4.57-6.amzn2023.0.4 | ALAS2023-2023-177 | Apr 27, 2023 |
| openldap-compat-debuginfo · amzn 2023 | 2.4.57-6.amzn2023.0.4 | ALAS2023-2023-177 | Apr 27, 2023 |
| openldap-debuginfo · amzn 2023 | 2.4.57-6.amzn2023.0.4 | ALAS2023-2023-177 | Apr 27, 2023 |
| openldap-debugsource · amzn 2023 | 2.4.57-6.amzn2023.0.4 | ALAS2023-2023-177 | Apr 27, 2023 |
| openldap-devel · amzn 2023 | 2.4.57-6.amzn2023.0.4 | ALAS2023-2023-177 | Apr 27, 2023 |
| openldap-servers · amzn 2023 | 2.4.57-6.amzn2023.0.4 | ALAS2023-2023-177 | Apr 27, 2023 |
| openldap-servers-debuginfo · amzn 2023 | 2.4.57-6.amzn2023.0.4 | ALAS2023-2023-177 | Apr 27, 2023 |
| slapd · Ubuntu 18.04.6 LTS (bionic) | 2.4.45+dfsg-1ubuntu1.10 | slapd 2.4.45+dfsg-1ubuntu1.10 | Feb 13, 2021 |
| slapd · Ubuntu 20.04 LTS (focal) | 2.4.49+dfsg-2ubuntu1.7 | slapd 2.4.49+dfsg-2ubuntu1.7 | Feb 13, 2021 |
| slapd · Ubuntu 24.10 (oracular) | 2.4.57+dfsg-2ubuntu1 | slapd 2.4.57+dfsg-2ubuntu1 | Jan 16, 2026 |
| slapd · Ubuntu 25.04 (plucky) | 2.4.57+dfsg-2ubuntu1 | slapd 2.4.57+dfsg-2ubuntu1 | Jan 16, 2026 |
| slapd-contrib · Ubuntu 20.04 LTS (focal) | 2.4.49+dfsg-2ubuntu1.7 | slapd-contrib 2.4.49+dfsg-2ubuntu1.7 | Feb 13, 2021 |
| slapd-contrib · Ubuntu 24.10 (oracular) | 2.4.57+dfsg-2ubuntu1 | slapd-contrib 2.4.57+dfsg-2ubuntu1 | Jan 16, 2026 |
| slapd-contrib · Ubuntu 25.04 (plucky) | 2.4.57+dfsg-2ubuntu1 | slapd-contrib 2.4.57+dfsg-2ubuntu1 | Jan 16, 2026 |
| slapd-smbk5pwd · Ubuntu 18.04.6 LTS (bionic) | 2.4.45+dfsg-1ubuntu1.10 | slapd-smbk5pwd 2.4.45+dfsg-1ubuntu1.10 | Feb 13, 2021 |
| slapd-smbk5pwd · Ubuntu 20.04 LTS (focal) | 2.4.49+dfsg-2ubuntu1.7 | slapd-smbk5pwd 2.4.49+dfsg-2ubuntu1.7 | Feb 13, 2021 |
| slapd-smbk5pwd · Ubuntu 24.10 (oracular) | 2.4.57+dfsg-2ubuntu1 | slapd-smbk5pwd 2.4.57+dfsg-2ubuntu1 | Jan 16, 2026 |
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