Vulnerability · CVE-2020-25710
A flaw was found in OpenLDAP in versions before 2.4.56.
Published May 28, 2021 · catalog updated Oct 14, 2026 · A flaw was found
Check if you run it
No confirmed exploitation is on record for CVE-2020-25710. EPSS is 2.73%. Act only if a listed version of A flaw was found is installed.
Gaps on this record
- The stored product name is a package slug. The name on this page is taken from the title (A flaw was found).
- 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
- 2.73%
- Remediation
- Advisory link
- Affected products
- cpe debian/debian linux · cpe fedoraproject/fedora · cpe openldap/openldap · cpe redhat/enterprise linux · cpe redhat/jboss core services · cpe redhat/jboss enterprise application platform
A flaw was found in OpenLDAP in versions before 2.4.56. This flaw allows an attacker who sends a malicious packet processed by OpenLDAP to force a failed assertion in csnNormalize23(). The highest threat from this vulnerability is to system availability.
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 debian/debian linux9.0
- cpe fedoraproject/fedora33
- cpe openldap/openldapversion unspecified
- cpe redhat/enterprise linux5.0
- cpe redhat/enterprise linux6.0
- cpe redhat/enterprise linux7.0
- cpe redhat/jboss core servicesversion unspecified
- cpe redhat/jboss enterprise application platform5.0.0
- cpe redhat/jboss enterprise web server2.0.0
How to fix CVE-2020-25710
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-2020-25710. EPSS is 2.73%. Act only if a listed version of A flaw was found is installed.
Which versions are affected?
Compare what you have installed with debian/debian linux 9.0; redhat/enterprise linux 5.0; redhat/enterprise linux 6.0; redhat/enterprise linux 7.0. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-617. EPSS 2.73%. 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.
May 28, 2021 · NIST NVD
Detected
A flaw was found in OpenLDAP in versions before 2.4.56. This flaw allows an attacker who sends a malicious packet processed by OpenLDAP to force a failed assertion in csnNormalize23(). The highest threat from this vulnerability is to system availability.
Oct 14, 2026 · NIST NVD
Updated
A flaw was found in OpenLDAP in versions before 2.4.56. This flaw allows an attacker who sends a malicious packet processed by OpenLDAP to force a failed assertion in csnNormalize23(). The highest threat from this vulnerability is to system availability.
Sources
- CVE.orgVulnerability recordCVE-2020-25710
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2020-25710
30-day exploitation probability 2.7%
first.org - NIST NVDVulnerability recordCVE-2020-25710
A flaw was found in OpenLDAP in versions before 2.4.56. This flaw allows an attacker who sends a malicious packet processed by OpenLDAP to force a failed assertion in csnNormalize23(). The highest threat from this vulnerability is to system availability.
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.