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Fencer Intel
high 7.5

CVE-2020-25709 json

A flaw was found in OpenLDAP.

published 5y ago modified 26d ago also BIT-openldap-2020-25709 , EUVD-2020-18364 , JLSEC-2026-161

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.4%
EPSS 3.4% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

A flaw was found in OpenLDAP. This flaw allows an attacker who can send a malicious packet to be processed by OpenLDAP’s slapd server, to trigger an assertion failure. The highest threat from this vulnerability is to system availability.

Patch / fix

  • bitnami openldap 2.4.56
  • julia OpenLDAPClient_jll 2.5.14+0
  • 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, Debian 12 2.4.56+dfsg-1

debian advisories DEBIAN-CVE-2020-25709

  • openldap Ubuntu 16.04 LTS 2.4.42+dfsg-2ubuntu3.11
  • openldap Ubuntu 18.04 LTS 2.4.45+dfsg-1ubuntu1.8
  • openldap Ubuntu 20.04 LTS 2.4.49+dfsg-2ubuntu1.5
  • openldap Ubuntu Pro 14.04 LTS 2.4.31-1+nmu2ubuntu8.5+esm4

ubuntu advisories UBUNTU-CVE-2020-25709

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 7 2.4.44-25.el7_9
  • openldap-clients RHEL 7 2.4.44-25.el7_9
  • openldap-servers RHEL 7 2.4.44-25.el7_9
  • openldap-servers-sql RHEL 7 2.4.44-25.el7_9

red hat advisories RHSA-2022:0621

  • openldap2 SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +2 more 2.4.41-18.24.26.1
  • openldap2-client-openssl1 SLES 11-SECURITY 2.4.26-0.74.19.1
  • openldap2 SLE Module for Legacy 15 SP2, SLE Module for Development Tools 15 SP2, SLE Module for Basesystem 15 SP2 2.4.46-9.45.1
  • openldap2 SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 2.4.41-18.80.1

suse advisories SUSE-SU-2021:0142-1SUSE-SU-2021:14597-1SUSE-SU-2021:0129-1SUSE-SU-2021:0128-1

  • openldap2 openSUSE Leap 15.2 2.4.46-lp152.14.15.1
  • openldap2 openSUSE Leap 15.1 2.4.46-lp151.10.24.1

opensuse advisories openSUSE-SU-2021:0107-1openSUSE-SU-2021:0102-1

  • openldap Alpine 3.10, Alpine 3.9 2.4.48-r2
  • openldap Alpine 3.11 2.4.48-r3
  • openldap Alpine 3.12 2.4.50-r1
  • openldap Alpine 3.24, Alpine 3.23, Alpine 3.22 +9 more 2.4.56-r0

alpine advisories ALPINE-CVE-2020-25709

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Is CVE-2020-25709 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2020-25709 updated cvss 7.5

openldap: assertion failure in Certificate List syntax validation

  • Red Hat Enterprise Linux 5 openldap, openldap24-libs Red Hat Enterprise Linux 6 openldap, compat-openldap, openldap-clients, openldap-servers, openldap-servers-sql Red Hat Enterprise Linux 7 compat-openldap Red Hat JBoss Enterprise Application Platform 5 openldap Red Hat JBoss Enterprise Web Server 2 openldap
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux Client (v. 7) openldap 2.4.44-25.el7_9, openldap-clients 2.4.44-25.el7_9 Red Hat Enterprise Linux Client Optional (v. 7) openldap-servers 2.4.44-25.el7_9, openldap-servers-sql 2.4.44-25.el7_9 Red Hat Enterprise Linux ComputeNode Optional (v. 7) openldap-servers 2.4.44-25.el7_9, openldap-servers-sql 2.4.44-25.el7_9 Red Hat Enterprise Linux Server (v. 7) openldap 2.4.44-25.el7_9, openldap-clients 2.4.44-25.el7_9, openldap-servers 2.4.44-25.el7_9 Red Hat Enterprise Linux Server Optional (v. 7) openldap-servers-sql 2.4.44-25.el7_9 Red Hat Enterprise Linux Workstation (v. 7) openldap 2.4.44-25.el7_9, openldap-clients 2.4.44-25.el7_9, openldap-servers 2.4.44-25.el7_9
    +1 more products
    Red Hat Enterprise Linux Workstation Optional (v. 7) openldap-servers-sql 2.4.44-25.el7_9
    fixed: vendor fix RHSA-2022:0621
  • Red Hat Enterprise Linux 8 openldap, openldap-clients, openldap-servers Red Hat JBoss Core Services openldap
    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-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-22-116-01 updated cvss 7.5

Hitachi Energy System Data Manager

  • Hitachi Energy All System Data Manager - SDM600 <1.2 FP2 HF10 (Build Nr. 1.2.14002.506)
    affected: mitigation “Implement and continuously revise least privileges principles to minimize permissions and accesses to SDM600 related resources.” hitachiabb-powergrids.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

3.44% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P
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
<2.4.56
2.4.56
julia OpenLDAPClient_jll
<2.5.14+0
2.5.14+0

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 Intel 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.