Security readout for executives and security teams
Plain-English summary
This flaw means some Perl applications using Apache::Session::LDAP could trust an LDAPS server certificate without validating it. If an attacker can position themselves between the application and LDAP service, session data could be exposed or altered. Sources do not report active exploitation.
Executive priority
Treat as a high-priority dependency and configuration risk for systems that store sessions in LDAP. It is most urgent where the LDAP path crosses untrusted networks or supports sensitive authentication workflows.
Technical view
Apache::Session::LDAP before 0.5 used Net::LDAPS defaults that did not check X.509 certificate validity when connecting to remote LDAP backends. The issue is CWE-295 improper certificate validation with CVSS 8.1, reflecting potential confidentiality, integrity, and availability impact under high-complexity network conditions.
Likely exposure
Exposure is most likely in Perl applications using Apache::Session::LDAP before 0.5 with remote LDAPS-backed session storage. The source bundle provides no CPEs, so inventory must rely on package, dependency, and runtime configuration review.
Exploitation context
The bundle does not identify public exploitation, and KEV is false. Practical abuse appears to require the attacker to interfere with or impersonate the LDAPS connection path; this is plausible in compromised, hostile, or poorly segmented networks.
Researcher notes
Evidence is concise but consistent: the CVE description, upstream commit, and Debian advisory identify default certificate validation failure in Apache::Session::LDAP before 0.5. No public source in the bundle establishes exploitation in the wild.
Mitigation direction
- Upgrade Apache::Session::LDAP to 0.5 or a vendor-patched package.
- Apply Debian DLA 3284-1 updates where using libapache-session-ldap-perl.
- Review vendor guidance tied to CVE-2020-16093 where relevant.
- Ensure LDAPS certificate validation is explicitly enabled in configuration.
- Prioritize systems handling authentication or session data.
Validation and detection
- Inventory applications importing Apache::Session::LDAP or libapache-session-ldap-perl.
- Check installed package or module versions against the before-0.5 affected range.
- Review LDAPS settings for explicit certificate validation behavior.
- Confirm patched builds include the referenced upstream fix.
- Verify LDAP session backends use trusted certificates and expected hostnames.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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-295: 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 lookupCVE-2020-36658 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
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.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H2.25.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.1HighVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Certificate Validation
Improper Certificate Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.