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CVE Record

CVE-2020-25710: A flaw was found in OpenLDAP in versions before 2.4.56.

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.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2020-25710 is an OpenLDAP denial-of-service flaw. A specially crafted packet can trigger a failed assertion and crash or disrupt the LDAP service. The documented impact is availability, not data theft or privilege escalation.

Executive priority

Prioritize remediation where OpenLDAP supports authentication, directory lookup, or production service dependencies. Business risk is service disruption rather than confirmed compromise, so handle promptly within normal vulnerability operations unless LDAP is externally exposed.

Technical view

OpenLDAP before 2.4.56 can hit a failed assertion in csnNormalize23() when processing malicious input. The CVE maps to CWE-617, reachable assertion. Public sources identify vendor security updates and an upstream commit, but the bundle provides no CVSS vector.

Likely exposure

Exposure is most likely in systems running OpenLDAP server packages before 2.4.56, or downstream products that bundle affected OpenLDAP. Internet-facing or broadly reachable LDAP services carry more operational risk.

Exploitation context

The source bundle does not show CISA KEV listing or cited evidence of active exploitation. It describes attacker-controlled packets causing service availability impact. Treat exploit status as unconfirmed from the provided evidence.

Researcher notes

Evidence is strongest for availability impact through an assertion failure in csnNormalize23(). The bundle includes upstream commit and vendor advisories, but no CVSS details, exploit confirmation, or broad affected downstream product list.

Mitigation direction

  • Upgrade OpenLDAP to 2.4.56 or a vendor-patched package.
  • Apply Debian, Red Hat, NetApp, or other vendor guidance where applicable.
  • Limit LDAP access to trusted networks where business requirements allow.
  • Prioritize systems where LDAP outage affects authentication or directory-dependent services.

Validation and detection

  • Inventory OpenLDAP versions and identify deployments before 2.4.56.
  • Confirm distribution security updates for OpenLDAP are installed.
  • Check vendor appliances or images for bundled OpenLDAP exposure.
  • Review service logs for slapd assertion failures or unexpected LDAP crashes.
  • Verify LDAP-dependent authentication paths after remediation.
Prepared
Confidence
high
Sources
7

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-617: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2020-25710 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
8Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/aopenldapopenldap 2.4.56Listed
Weakness

CWE details

CWE-617

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-617 · source CWE mapping

Reachable Assertion

Reachable Assertion represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs