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No exploitation reportedFix available

CVE-2020-12243

No exploitation reported by the sources we read.

  • Published2020-04-28
  • Fixed in2.4.50
  • WeaknessCWE-674

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

In filter.c in slapd in OpenLDAP before 2.4.50, LDAP search filters with nested boolean expressions can result in denial of service (daemon crash).

Timeline

dates in UTC
  1. 2020-04-2819:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-12243?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-12243?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Openldap
BranchAffectedFixed in
2.4< 2.4.502.4.50
Canonical ubuntu linux
BranchAffectedFixed in
12.4= 12.04no fix published
14.4= 14.04no fix published
16.4= 16.04no fix published
18.4= 18.04no fix published
19.10= 19.10no fix published
20.4= 20.04no fix published
Apple mac os x
BranchAffectedFixed in
10.15≥ 10.15, < 10.15.610.15.6
10.14≥ 10.14.0, < 10.14.610.14.6
10.13≥ 10.13.0, < 10.13.610.13.6
10.13= 10.13.6no fix published
10.14= 10.14.6no fix published

15 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • openldapUbuntu:Pro:14.04:LTSall versions · fixed in 2.4.31-1+nmu2ubuntu8.5+esm2
  • openldapUbuntu:20.04:LTSall versions · fixed in 2.4.49+dfsg-2ubuntu1.2
  • openldapUbuntu:18.04:LTSall versions · fixed in 2.4.45+dfsg-1ubuntu1.5
  • openldapUbuntu:16.04:LTSall versions · fixed in 2.4.42+dfsg-2ubuntu3.8
  • openldapTuxCare:OracleLinux:6all versions · fixed in 2.4.58-1.el6.tuxcare.els1and 4 other packages
  • openldapTuxCare:CentOS:8.5all versions · fixed in 2.4.46-18.el8.tuxcare.els4and 3 other packages
  • openldapTuxCare:CentOS:8.4all versions · fixed in 2.4.46-17.el8_4.tuxcare.els4and 3 other packages
  • openldapTuxCare:CentOS:6all versions · fixed in 2.4.58-1.el6.tuxcare.els1and 4 other packages

64 more package ranges on OSV.dev

Vendor advisories

  • CVE-2020-12243 Red Hat Product Security74 products fixed · 11 known affected

    openldap: denial of service via nested boolean expressions in LDAP search filters

    openldap.src as a component of Red Hat Enterprise Linux 5 · compat-openldap as a component of Red Hat Enterprise Linux 6 · openldap as a component of Red Hat Enterprise Linux 6 · +8 more

  • ICSA-23-348-10 CISA5 known affected

    Siemens SIMATIC S7-1500

    SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) · SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) · +2 more

  • SSA-398330 Siemens ProductCERT5 known affected

    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

    SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= V3.1.0 < V3.1.5 · SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= V3.1.0 < V3.1.5 · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= V3.1.0 < V3.1.5 · +2 more

  • ICSA-22-116-01 CISA1 known affected

    Hitachi Energy System Data Manager

    All System Data Manager - SDM600: versions prior to version 1.2 FP2 HF10 (Build Nr. 1.2.14002.506)

  • RHSA-2021:0949 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat OpenShift Do openshift/odo-init-image 1.1.3 security update

  • RHSA-2020:4041 Red Hat Product Security73 products fixed

    Red Hat Security Advisory: openldap security update

Full record on NVD

Fix

  1. Update Openldap to 2.4.50
  2. Vendor fix CISA ICSA-23-348-10 · 5 productsUpdate to V3.1.5 or later version
  3. Vendor fix Siemens ProductCERT SSA-398330 · 1 productUpdate to V3.1.5 or later version
  4. Vendor fix Red Hat Product Security RHSA-2021:0949 · 1 productDownload and install a new CLI binary by following the instructions linked from the References section.
  5. Vendor fix Red Hat Product Security RHSA-2020:4041 · 73 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
  6. Mitigation from the vendor CISA ICSA-23-348-10 · 5 productsOnly build and run applications from trusted sources.
  7. Mitigation from the vendor CISA ICSA-23-348-10 · 1 productLimit remote access to port 22350/tcp on systems where the Codemeter runtime network server is running (for details refer to the updated security manual of WinCC OA).

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2020-04-28
Last Modified
2026-10-14
NVD status
Modified
GitHub Advisory
GHSA-v3qx-x9jr-g987

Frequently asked questions

What is CVE-2020-12243?

In filter.c in slapd in OpenLDAP before 2.4.50, LDAP search filters with nested boolean expressions can result in denial of service (daemon crash).

Is CVE-2020-12243 actively exploited?

Active exploitation of CVE-2020-12243 has not been confirmed. Its EPSS score was 4.7% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-12243?

CVE-2020-12243 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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