Vulnerability · 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).
Published Apr 28, 2020 · catalog updated Oct 14, 2026 · In filter.c in slapd
Check if you run it
No confirmed exploitation is on record for CVE-2020-12243. EPSS is 4.72%. Act only if a listed version of In filter.c in slapd is installed.
Gaps on this record
- The stored product name is a package slug. The name on this page is taken from the title (In filter.c in slapd).
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- High7.5
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 4.72%
- Remediation
- Advisory link
- Affected products
- cpe canonical/ubuntu linux · cpe debian/debian linux · cpe netapp/cloud backup · cpe netapp/h300s firmware · cpe netapp/h410c firmware · cpe netapp/h500s firmware
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).
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- cpe canonical/ubuntu linux12.04
- cpe canonical/ubuntu linux14.04
- cpe canonical/ubuntu linux16.04
- cpe debian/debian linux10.0
- cpe debian/debian linux8.0
- cpe debian/debian linux9.0
- cpe netapp/cloud backupversion unspecified
- cpe netapp/h300s firmwareversion unspecified
- cpe netapp/h410c firmwareversion unspecified
- cpe netapp/h500s firmwareversion unspecified
- cpe openldap/openldapversion unspecified
- cpe opensuse/leap15.1
How to fix CVE-2020-12243
Recommended remediation
A patch or advisory reference is linked. Open the original publisher for availability by product version.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2020-12243. EPSS is 4.72%. Act only if a listed version of In filter.c in slapd is installed.
Which versions are affected?
Compare what you have installed with canonical/ubuntu linux 12.04; canonical/ubuntu linux 14.04; canonical/ubuntu linux 16.04; debian/debian linux 10.0. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-674. EPSS 4.72%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Apr 28, 2020 · NIST NVD
Detected
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).
Oct 14, 2026 · NIST NVD
Updated
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).
Sources
- CVE.orgVulnerability recordCVE-2020-12243
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2020-12243
30-day exploitation probability 4.7%
first.org - NIST NVDVulnerability recordCVE-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).
nvd.nist.gov
References
Freshness
Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.