CVE-2020-36658

In Apache::Session::LDAP before 0.5, validity of the X.509 certificate is not checked by default...

8.1 HighFix available

In Apache::Session::LDAP before 0.5, validity of the X.509 certificate is not checked by default when connecting to remote LDAP backends, because the default configuration of the Net::LDAPS module for Perl is used. NOTE: this can, for example, be fixed in conjunction with the CVE-2020-16093 fix.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

0.46%Down 0.4 points since Jan 27, 2023

What each source reports

NVD Score used 8.1

Record: CVE-2020-36658
CVSS 3.1: 8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-295
Updated: 2026-11-02

CVE List 8.1

Record: CVE-2020-36658
CVSS 3.1: 8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-295
Updated: 2026-11-02

EUVDEUVD-2020-24104 8.1

Record: EUVD-2020-24104
CVSS 3.1: 8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-qf7m-fmfh-9c8v 8.1

In Apache::Session::LDAP before 0.5, validity of the X.509 certificate is not checked by default...

Record: GHSA-qf7m-fmfh-9c8v
CVSS 3.1: 8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-295
Updated: 2026-11-02

OSV 8.1

Record: CVE-2020-36658
CVSS 3.1: 8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2020-36658 8.1

Record: DEBIAN-CVE-2020-36658
CVSS 3.1: 8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2020-36658 8.1

Record: UBUNTU-CVE-2020-36658
CVSS 3.1: 8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVUSN-6596-1 No score

libapache-session-ldap-perl vulnerability

It was discovered that Apache::Session::LDAP incorrectly handled invalid X.509 certificates. If a user or an automated system were tricked into opening a specially crafted invalid X.509 certificate, a remote attacker could possibly use this issue to perform spoofing and obtain sensitive information.

Record: USN-6596-1
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`libapache-session-ldap-perl` Debian:12	before 0.5-1	0.5-1
`libapache-session-ldap-perl` Debian:13	before 0.5-1	0.5-1
`libapache-session-ldap-perl` Debian:14	before 0.5-1	0.5-1
`libapache-session-ldap-perl` Debian:10	before 0.4-1+deb10u1, plus listed versions 0.4-1	0.4-1+deb10u1
`libapache-session-ldap-perl` Ubuntu:Pro:16.04:LTS	before 0.4-1ubuntu0.16.04.1~esm1, plus listed versions 0.4-1	0.4-1ubuntu0.16.04.1~esm1
`libapache-session-ldap-perl` Ubuntu:Pro:18.04:LTS	before 0.4-1ubuntu0.18.04.1~esm1, plus listed versions 0.4-1	0.4-1ubuntu0.18.04.1~esm1
`libapache-session-ldap-perl` Ubuntu:20.04:LTS	before 0.4-1+deb10u1build0.20.04.1, plus listed versions 0.4-1	0.4-1+deb10u1build0.20.04.1

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-36658 is a high vulnerability (CVSS 8.1) in Debian Linux, published January 27, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.46%, the 40th percentile. Fixed in libapache-session-ldap-perl 0.5-1.