Skip to content
Fencer Vulns
high 7.5

CVE-2023-2953 json

A vulnerability was found in openldap.

published 2023-05-30 3 y ago modified 2026-10-14 25 d ago also BIT-openldap-2023-2953 , EUVD-2023-34399

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.0%
EPSS 2.0% chance of exploitation in 30 days, percentile 80%
public exploits
0
none known

Summary

A vulnerability was found in openldap. This security flaw causes a null pointer dereference in ber_memalloc_x() function.

Patch / fix

  • bitnami openldap 2.4.1
  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP V3.1.5
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP V3.1.5
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP V3.1.5
  • openldap Debian 14, Debian 13 2.5.16+dfsg-1

debian advisories DEBIAN-CVE-2023-2953

  • openldap Ubuntu 20.04 LTS 2.4.49+dfsg-2ubuntu1.10
  • openldap Ubuntu 22.04 LTS 2.5.16+dfsg-0ubuntu0.22.04.2
  • openldap Ubuntu Pro 14.04 LTS 2.4.31-1+nmu2ubuntu8.5+esm6
  • openldap Ubuntu Pro 16.04 LTS 2.4.42+dfsg-2ubuntu3.13+esm2
  • openldap Ubuntu Pro 18.04 LTS 2.4.45+dfsg-1ubuntu1.11+esm1

ubuntu advisories UBUNTU-CVE-2023-2953

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • openldap RHEL 8 2.4.46-19.el8_10
  • openldap-clients RHEL 8 2.4.46-19.el8_10
  • openldap-servers RHEL 8 2.4.46-19.el8_10
  • openldap RHEL 9.2 EUS 2.6.2-3.el9_2.1
  • openldap-compat RHEL 9.2 EUS 2.6.2-3.el9_2.1
  • openldap-clients RHEL 9.2 EUS 2.6.2-3.el9_2.1
  • openldap RHEL 9.0 E4S 2.6.2-1.el9_0.1
  • openldap-compat RHEL 9.0 E4S 2.6.2-1.el9_0.1

red hat advisories RHSA-2025:8181RHSA-2025:8176RHSA-2024:6033RHSA-2024:4264

  • openldap2 SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLE Module for Legacy 12 2.4.41-45.1
  • openldap2 SLE Real Time 15 SP3, SLE Module for Development Tools 15 SP5, SLE Module for Development Tools 15 SP4 +9 more 2.4.46-150200.14.14.1
  • openldap2 SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 2.4.41-22.19.1

suse advisories SUSE-SU-2023:2503-1SUSE-SU-2023:2484-1SUSE-SU-2023:2483-1

  • openldap AlmaLinux 8 2.4.46-19.el8_10
  • openldap-clients AlmaLinux 8 2.4.46-19.el8_10
  • openldap-servers AlmaLinux 8 2.4.46-19.el8_10

almalinux advisories ALSA-2024:4264

  • openldap Rocky Linux 8 2.4.46-19.el8_10

rocky linux advisories RLSA-2024:4264

  • openldap CBL-Mariner 2.0 2.4.57-9

azure linux advisories AZL-27011

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-2953 updated cvss 7.1

openldap: null pointer dereference in ber_memalloc_x function

  • Red Hat Enterprise Linux 6 openldap, compat-openldap, openldap-clients, openldap-servers, openldap-servers-sql Red Hat Enterprise Linux 7 openldap, compat-openldap, openldap-clients, openldap-servers, openldap-servers-sql
    affected: no fix planned “Out of support scope”
  • Red Hat CodeReady Linux Builder EUS (v.8.8) openldap-servers 2.4.46-20.el8_8
    fixed: vendor fix RHSA-2024:6033
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) openldap-devel 2.6.2-1.el9_0.1, openldap-debuginfo 2.6.2-1.el9_0.1, openldap-debugsource 2.6.2-1.el9_0.1, openldap-compat-debuginfo 2.6.2-1.el9_0.1, openldap-clients-debuginfo 2.6.2-1.el9_0.1
    fixed: vendor fix RHSA-2025:8176
  • Red Hat Enterprise Linux AppStream EUS (v.9.2) openldap-devel 2.6.2-3.el9_2.1, openldap-debuginfo 2.6.2-3.el9_2.1, openldap-debugsource 2.6.2-3.el9_2.1, openldap-compat-debuginfo 2.6.2-3.el9_2.1, openldap-clients-debuginfo 2.6.2-3.el9_2.1
    fixed: vendor fix RHSA-2025:8181
  • Red Hat Enterprise Linux BaseOS (v. 8) openldap 2.4.46-19.el8_10, openldap-clients 2.4.46-19.el8_10
    fixed: vendor fix RHSA-2024:4264
  • Red Hat Enterprise Linux BaseOS E4S (v.9.0) openldap 2.6.2-1.el9_0.1, openldap-compat 2.6.2-1.el9_0.1, openldap-clients 2.6.2-1.el9_0.1
    fixed: vendor fix RHSA-2025:8176
  • Red Hat Enterprise Linux BaseOS EUS (v.8.8) openldap 2.4.46-20.el8_8, openldap-clients 2.4.46-20.el8_8
    fixed: vendor fix RHSA-2024:6033
  • Red Hat Enterprise Linux BaseOS EUS (v.9.2) openldap 2.6.2-3.el9_2.1, openldap-compat 2.6.2-3.el9_2.1, openldap-clients 2.6.2-3.el9_2.1
    fixed: vendor fix RHSA-2025:8181
show 2 more
  • Red Hat Enterprise Linux CRB (v. 8) openldap-servers 2.4.46-19.el8_10
    fixed: vendor fix RHSA-2024:4264
  • Red Hat Enterprise Linux 9 openldap, openldap-compat, openldap-clients
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-25-259-02 updated cvss 7.5

Hitachi Energy RTU500 Series

  • Hitachi Energy RTU500 series CMU Firmware vers:RTU500_series_CMU_Firmware/>=12.7.1, <=12.7.7, vers:RTU500_series_CMU_Firmware/>=13.5.1, <=13.5.3, 13.6.1, vers:RTU500_series_CMU_Firmware/>=13.7.1, <=13.7.6
    affected: vendor fix, mitigation

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-23-348-10 updated cvss 7.5

Siemens SIMATIC S7-1500

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= 3.1.0, < 3.1.5 Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= 3.1.0, < 3.1.5
    affected: fixed in V3.1.5, mitigation support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-24-046-11 updated cvss 7.5

Siemens SCALANCE XCM-/XRM-300

  • Siemens SCALANCE XCH328 (6GK5328-4TS01-2EC2) <V2.4 Siemens SCALANCE XCM324 (6GK5324-8TS01-2AC2) <V2.4 Siemens SCALANCE XCM328 (6GK5328-4TS01-2AC2) <V2.4 Siemens SCALANCE XCM332 (6GK5332-0GA01-2AC2) <V2.4 Siemens SCALANCE XRH334 (24 V DC, 8xFO, CC) (6GK5334-2TS01-2ER3) <V2.4 Siemens SCALANCE XRM334 (2x230 V AC, 8xFO) (6GK5334-2TS01-4AR3) <V2.4
    +5 more products
    Siemens SCALANCE XRM334 (2x230 V AC, 12xFO) (6GK5334-3TS01-4AR3) <V2.4 Siemens SCALANCE XRM334 (24 V DC, 8xFO) (6GK5334-2TS01-2AR3) <V2.4 Siemens SCALANCE XRM334 (24 V DC, 12xFO) (6GK5334-3TS01-2AR3) <V2.4 Siemens SCALANCE XRM334 (230 V AC, 8xFO) (6GK5334-2TS01-3AR3) <V2.4 Siemens SCALANCE XRM334 (230 V AC, 12xFO) (6GK5334-3TS01-3AR3) <V2.4
    affected: fixed in V2.4 support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
21 mo ago

Exploit prediction

2.00% chance of exploitation in the next 30 days, higher than 80% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
bitnami openldap
>=2.4.0, <2.4.1
2.4.1

Affected products

  • n/a openldap
  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.