Description
A flaw was discovered in OpenLDAP before 2.4.57 leading to a memch->bv_len miscalculation and slapd crash in the saslAuthzTo processing, resulting in denial of service.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | openldap | 2.4.57+dfsg-1 | — |
| Debian 13 | openldap | 2.4.57+dfsg-1 | — |
| Debian 12 | openldap | 2.4.57+dfsg-1 | — |
| Debian 10 | openldap | 2.4.47+dfsg-3+deb10u5 | DSA-4845-1 |
| Debian 9 | openldap | 2.4.44+dfsg-5+deb9u7 | DLA-2544-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | openldap | 2.4.49+dfsg-2ubuntu1.6 | USN-4724-1 |
| Ubuntu 18.04 LTS | openldap | 2.4.45+dfsg-1ubuntu1.9 | USN-4724-1 |
| Ubuntu 16.04 LTS | openldap | 2.4.42+dfsg-2ubuntu3.12 | USN-4724-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 14.04 LTS | openldap | 2.4.31-1+nmu2ubuntu8.5+esm7 | USN-7698-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | openldap2 | 2.4.46-9.48.1 | SUSE-SU-2021:0723-1 |
| SLES 15 SP1 | openldap2 | 2.4.46-9.48.1 | SUSE-SU-2021:0723-1 |
| SLES 15 | openldap2 | 2.4.46-9.48.1 | SUSE-SU-2021:0723-1 |
| SLES 12 SP5 | openldap2 | 2.4.41-18.83.1 | SUSE-SU-2021:0693-1 |
| SLES 12 SP4 | openldap2 | 2.4.41-18.83.1 | SUSE-SU-2021:0693-1 |
Show 24 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | openldap2 | 2.4.41-18.83.1 | SUSE-SU-2021:0693-1 |
| SLES 12 SP2 | openldap2 | 2.4.41-18.83.1 | SUSE-SU-2021:0693-1 |
| SLES 12 | openldap2 | 2.4.41-39.1 | SUSE-SU-2021:0692-1 |
| SLES 11 SP4 | openldap2 +1 | 2.4.26-0.74.26.1 | SUSE-SU-2021:14700-1 |
| SLES 11 | openldap2-client-openssl1 | 2.4.26-0.74.26.1 | SUSE-SU-2021:14700-1 |
| SLES for SAP 15 SP1 | openldap2 | 2.4.46-9.48.1 | SUSE-SU-2021:0723-1 |
| SLES for SAP 15 | openldap2 | 2.4.46-9.48.1 | SUSE-SU-2021:0723-1 |
| SLES for SAP 12 SP5 | openldap2 | 2.4.41-18.83.1 | SUSE-SU-2021:0693-1, SUSE-SU-2021:0692-1 |
| SLES for SAP 12 SP4 | openldap2 | 2.4.41-18.83.1 | SUSE-SU-2021:0693-1, SUSE-SU-2021:0692-1 |
| SLES for SAP 12 SP3 | openldap2 | 2.4.41-18.83.1 | SUSE-SU-2021:0693-1, SUSE-SU-2021:0692-1 |
| SLES for SAP 12 SP2 | openldap2 | 2.4.41-18.83.1 | SUSE-SU-2021:0693-1, SUSE-SU-2021:0692-1 |
| SLE HPC 15 SP1 | openldap2 | 2.4.46-9.48.1 | SUSE-SU-2021:0723-1 |
| SLE HPC 15 | openldap2 | 2.4.46-9.48.1 | SUSE-SU-2021:0723-1 |
| SUSE OpenStack Cloud Crowbar 9 | openldap2 | 2.4.41-18.83.1 | SUSE-SU-2021:0693-1 |
| SUSE OpenStack Cloud Crowbar 8 | openldap2 | 2.4.41-18.83.1 | SUSE-SU-2021:0693-1 |
| SUSE OpenStack Cloud 9 | openldap2 | 2.4.41-18.83.1 | SUSE-SU-2021:0693-1 |
| SUSE OpenStack Cloud 8 | openldap2 | 2.4.41-18.83.1 | SUSE-SU-2021:0693-1 |
| SUSE OpenStack Cloud 7 | openldap2 | 2.4.41-18.83.1 | SUSE-SU-2021:0693-1 |
| SUSE Manager Server 4.0 | openldap2 | 2.4.46-9.48.1 | SUSE-SU-2021:0723-1 |
| SUSE Manager Retail Branch Server 4.0 | openldap2 | 2.4.46-9.48.1 | SUSE-SU-2021:0723-1 |
| SUSE Manager Proxy 4.0 | openldap2 | 2.4.46-9.48.1 | SUSE-SU-2021:0723-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | openldap2 +1 | 2.4.26-0.74.26.1 | SUSE-SU-2021:14700-1 |
| SUSE HPE Helion OpenStack 8 | openldap2 | 2.4.41-18.83.1 | SUSE-SU-2021:0693-1 |
| SUSE Enterprise Storage 6 | openldap2 | 2.4.46-9.48.1 | SUSE-SU-2021:0723-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.2 | openldap2 | 2.4.46-lp152.14.18.1 | openSUSE-SU-2021:0408-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | openldap | 2.4.57-r0 | — |
| Alpine v3.23 | openldap | 2.4.57-r0 | — |
| Alpine v3.22 | openldap | 2.4.57-r0 | — |
| Alpine v3.21 | openldap | 2.4.57-r0 | — |
| Alpine v3.20 | openldap | 2.4.57-r0 | — |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | openldap | 2.4.57-r0 | — |
| Alpine v3.18 | openldap | 2.4.57-r0 | — |
| Alpine v3.17 | openldap | 2.4.57-r0 | — |
| Alpine v3.16 | openldap | 2.4.57-r0 | — |
| Alpine v3.15 | openldap | 2.4.57-r0 | — |
| Alpine v3.14 | openldap | 2.4.57-r0 | — |
| Alpine v3.13 | openldap | 2.4.57-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | openldap +4 | 2.4.44-25.amzn2.0.5 | ALAS2-2023-2033 |
Advisories 13
- SSA-398330 SSA-398330: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP >= V3.1.0 and < V3.1.5 Siemens ProductCERT · Oct 13, 2026
- USN-7698-1 openldap vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-4724-1 openldap vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4845-1 openldap - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2544-1 openldap - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2021:0692-1 Security update for openldap2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:0693-1 Security update for openldap2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:0723-1 Security update for openldap2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:14700-1 Security update for openldap2 SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2023-1127 OpenLDAP: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Aug 24, 2025
- ICSA-23-348-10 Siemens SIMATIC S7-1500 CISA ICS & IT advisories · Aug 12, 2025
- openSUSE-SU-2021:0408-1 Security update for openldap2 SUSE / openSUSE Security Updates · May 7, 2025
- ALAS2-2023-2033 Important: openldap security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · May 2, 2023
References
- https://git.openldap.org/openldap/openldap/-/tags/OPENLDAP_REL_ENG_2_4_57
- https://git.openldap.org/openldap/openldap/-/commit/554dff1927176579d652f2fe60c90e9abbad4c65
- https://git.openldap.org/openldap/openldap/-/commit/c0b61a9486508e5202aa2e0cfb68c9813731b439
- https://git.openldap.org/openldap/openldap/-/commit/5a2017d4e61a6ddc4dcb4415028e0d08eb6bca26
- https://git.openldap.org/openldap/openldap/-/commit/d169e7958a3e0dc70f59c8374bf8a59833b7bdd8
- https://bugs.openldap.org/show_bug.cgi?id=9413
- [debian-lts-announce] 20210203 [SECURITY] [DLA 2544-1] openldap security update mailing-list
- DSA-4845 vendor-advisory
- https://security.netapp.com/advisory/ntap-20210226-0002/
- https://support.apple.com/kb/HT212529
- https://support.apple.com/kb/HT212531
- https://support.apple.com/kb/HT212530
- 20210526 APPLE-SA-2021-05-25-2 macOS Big Sur 11.4 mailing-list
- 20210526 APPLE-SA-2021-05-25-4 Security Update 2021-003 Catalina mailing-list
- 20210526 APPLE-SA-2021-05-25-3 Security Update 2021-004 Mojave mailing-list
- [guacamole-issues] 20210618 [jira] [Created] (GUACAMOLE-1368) Latest docker image fails security scans. mailing-list
- [bookkeeper-issues] 20210628 [GitHub] [bookkeeper] padma81 opened a new issue #2746: Security Vulnerabilities in CentOS 7 image, Upgrade image to CentOS 8 mailing-list
- [bookkeeper-issues] 20210629 [GitHub] [bookkeeper] padma81 opened a new issue #2746: Security Vulnerabilities in CentOS 7 image, Upgrade image to CentOS 8 mailing-list