Description
A NULL pointer dereference was found in OpenLDAP server and was fixed in openldap 2.4.55, during a request for renaming RDNs. An unauthenticated attacker could remotely crash the slapd process by sending a specially crafted request, causing a Denial of Service.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | openldap | openldap 2.4.55 | — |
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 | 2.4.55+dfsg-1 | — |
| Debian 13 | openldap | 2.4.55+dfsg-1 | — |
| Debian 12 | openldap | 2.4.55+dfsg-1 | — |
| Debian 10 | openldap | 2.4.47+dfsg-3+deb10u3 | DSA-4782-1 |
| Debian 9 | openldap | 2.4.44+dfsg-5+deb9u5 | DLA-2425-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | openldap | 2.4.49+dfsg-2ubuntu1.4 | USN-4622-1 |
| Ubuntu 18.04 LTS | openldap | 2.4.45+dfsg-1ubuntu1.7 | USN-4622-1 |
| Ubuntu 16.04 LTS | openldap | 2.4.42+dfsg-2ubuntu3.10 | USN-4622-1 |
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+esm3 | USN-4622-2 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | openldap +4 | 2.4.44-23.el7_9 | RHSA-2021:1389 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | openldap2 | 2.4.46-9.40.1 | SUSE-SU-2020:3313-1 |
| SLES 15 SP1 | openldap2 | 2.4.46-9.40.1 | SUSE-SU-2020:3313-1 |
| SLES 15 | openldap2 | 2.4.46-9.40.1 | SUSE-SU-2020:3313-1 |
| SLES 12 SP5 | openldap2 | 2.4.41-18.77.1 | SUSE-SU-2020:3314-1 |
| SLES 12 SP4 | openldap2 | 2.4.41-18.77.1 | SUSE-SU-2020:3314-1 |
Show 19 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | openldap2 | 2.4.41-18.77.1 | SUSE-SU-2020:3314-1 |
| SLES 12 SP2 | openldap2 | 2.4.41-18.77.1 | SUSE-SU-2020:3314-1 |
| SLES 12 | openldap2 | 2.4.41-18.24.23.1 | SUSE-SU-2020:3315-1 |
| SLES 11 SP4 | openldap2 +1 | 2.4.26-0.74.16.1 | SUSE-SU-2020:14541-1 |
| SLES 11 | openldap2-client-openssl1 | 2.4.26-0.74.16.1 | SUSE-SU-2020:14541-1 |
| SLES for SAP 15 | openldap2 | 2.4.46-9.40.1 | SUSE-SU-2020:3313-1 |
| SLES for SAP 12 SP5 | openldap2 | 2.4.41-18.24.23.1 | SUSE-SU-2020:3315-1, SUSE-SU-2020:3314-1 |
| SLES for SAP 12 SP4 | openldap2 | 2.4.41-18.24.23.1 | SUSE-SU-2020:3315-1, SUSE-SU-2020:3314-1 |
| SLES for SAP 12 SP3 | openldap2 | 2.4.41-18.24.23.1 | SUSE-SU-2020:3315-1, SUSE-SU-2020:3314-1 |
| SLES for SAP 12 SP2 | openldap2 | 2.4.41-18.24.23.1 | SUSE-SU-2020:3315-1, SUSE-SU-2020:3314-1 |
| SLE HPC 15 | openldap2 | 2.4.46-9.40.1 | SUSE-SU-2020:3313-1 |
| SUSE OpenStack Cloud Crowbar 9 | openldap2 | 2.4.41-18.77.1 | SUSE-SU-2020:3314-1 |
| SUSE OpenStack Cloud Crowbar 8 | openldap2 | 2.4.41-18.77.1 | SUSE-SU-2020:3314-1 |
| SUSE OpenStack Cloud 9 | openldap2 | 2.4.41-18.77.1 | SUSE-SU-2020:3314-1 |
| SUSE OpenStack Cloud 8 | openldap2 | 2.4.41-18.77.1 | SUSE-SU-2020:3314-1 |
| SUSE OpenStack Cloud 7 | openldap2 | 2.4.41-18.77.1 | SUSE-SU-2020:3314-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | openldap2 +1 | 2.4.26-0.74.16.1 | SUSE-SU-2020:14541-1 |
| SUSE HPE Helion OpenStack 8 | openldap2 | 2.4.41-18.77.1 | SUSE-SU-2020:3314-1 |
| SUSE Enterprise Storage 5 | openldap2 | 2.4.41-18.77.1 | SUSE-SU-2020:3314-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.2 | openldap2 | 2.4.46-lp152.14.12.1 | openSUSE-SU-2020:1918-1 |
| openSUSE Leap 15.1 | openldap2 | 2.4.46-lp151.10.21.1 | openSUSE-SU-2020:1920-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.12 | openldap | 2.4.50-r1 | — |
| Alpine v3.11 | openldap | 2.4.48-r3 | — |
| Alpine v3.10 | openldap | 2.4.48-r2 | — |
| Alpine v3.9 | openldap | 2.4.48-r2 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | openldap +4 | 2.4.44-23.amzn2 | ALAS2-2021-1638 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | openldap +4 | 2.4.44-23.el7_9 | ELSA-2021-1389 |
Advisories 18
- 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
- RHSA-2021:1389 Red Hat Security Advisory: openldap security update Red Hat Security Advisories (RHSA) · Aug 5, 2026
- USN-4622-2 openldap vulnerability Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-4622-1 openldap vulnerability Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4782-1 openldap - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2425-1 openldap - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2020:3313-1 Security update for openldap2 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1918-1 Security update for openldap2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:14541-1 Security update for openldap2 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1920-1 Security update for openldap2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:3314-1 Security update for openldap2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:3315-1 Security update for openldap2 SUSE / openSUSE Security Updates · Feb 4, 2026
- ICSA-23-348-10 Siemens SIMATIC S7-1500 CISA ICS & IT advisories · Aug 12, 2025
- WID-SEC-2024-3161 OpenLDAP: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Oct 14, 2024
- ICSA-23-059-01 Hitachi Energy Gateway Station CISA ICS & IT advisories · Mar 6, 2023
- ICSA-22-272-02 Hitachi Energy MicroSCADA Pro X SYS600 CISA ICS & IT advisories · Sep 29, 2022
- ALAS2-2021-1638 Moderate: openldap security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · May 24, 2021
- ELSA-2021-1389 Moderate: openldap security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Apr 28, 2021