ldap-utils: An integer underflow was discovered in OpenLDAP before 2.4.57 leading to a slapd crash in the Certificate List Exact...
CVE-2020-36228 is fixed in 7 products on 1 platform, first by ldap-utils 2.4.45+dfsg-1ubuntu1.9, released January 26, 2021. It is not reported as exploited. Patch Radar priority: Routine.
An integer underflow was discovered in OpenLDAP before 2.4.57 leading to a slapd crash in the Certificate List Exact Assertion processing, resulting in denial of service.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| ldap-utils · Ubuntu 18.04.6 LTS (bionic) | 2.4.45+dfsg-1ubuntu1.9 | ldap-utils 2.4.45+dfsg-1ubuntu1.9 | Jan 26, 2021 |
| ldap-utils · Ubuntu 20.04 LTS (focal) | 2.4.49+dfsg-2ubuntu1.6 | ldap-utils 2.4.49+dfsg-2ubuntu1.6 | Jan 26, 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-1ubuntu1.9 | libldap-2.4-2 2.4.45+dfsg-1ubuntu1.9 | Jan 26, 2021 |
| libldap-2.4-2 · Ubuntu 20.04 LTS (focal) | 2.4.49+dfsg-2ubuntu1.6 | libldap-2.4-2 2.4.49+dfsg-2ubuntu1.6 | Jan 26, 2021 |
| libldap-common · Ubuntu 18.04.6 LTS (bionic) | 2.4.45+dfsg-1ubuntu1.9 | libldap-common 2.4.45+dfsg-1ubuntu1.9 | Jan 26, 2021 |
| libldap-common · Ubuntu 20.04 LTS (focal) | 2.4.49+dfsg-2ubuntu1.6 | libldap-common 2.4.49+dfsg-2ubuntu1.6 | Jan 26, 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 |
| slapd · Ubuntu 18.04.6 LTS (bionic) | 2.4.45+dfsg-1ubuntu1.9 | slapd 2.4.45+dfsg-1ubuntu1.9 | Jan 26, 2021 |
| slapd · Ubuntu 20.04 LTS (focal) | 2.4.49+dfsg-2ubuntu1.6 | slapd 2.4.49+dfsg-2ubuntu1.6 | Jan 26, 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-2ubuntu1.6 | slapd-contrib 2.4.49+dfsg-2ubuntu1.6 | Jan 26, 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-1ubuntu1.9 | slapd-smbk5pwd 2.4.45+dfsg-1ubuntu1.9 | Jan 26, 2021 |
| slapd-smbk5pwd · Ubuntu 20.04 LTS (focal) | 2.4.49+dfsg-2ubuntu1.6 | slapd-smbk5pwd 2.4.49+dfsg-2ubuntu1.6 | Jan 26, 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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