CVE-2020-13881

In support.c in pam_tacplus 1.3.8 through 1.5.1, the TACACS+ shared secret gets logged via syslog...

7.5 HighFix available

In support.c in pam_tacplus 1.3.8 through 1.5.1, the TACACS+ shared secret gets logged via syslog if the DEBUG loglevel and journald are used.

Attack profile

How easy it is to exploit

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

What an attacker can affect

Confidentiality: High
Integrity: None
Availability: None

Exploit likelihood

1.71%Up 0.3 points since Apr 14, 2021

What each source reports

NVD Score used 7.5

In support.c in pam_tacplus 1.3.8 through 1.5.1, the TACACS+ shared secret gets logged via syslog if the DEBUG loglevel and journald are used.

Record: CVE-2020-13881
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 2.0: 4.3 MediumAV:N/AC:M/Au:N/C:P/I:N/A:N
Weakness: CWE-532
Updated: 2026-11-02

CVE List No score

In support.c in pam_tacplus 1.3.8 through 1.5.1, the TACACS+ shared secret gets logged via syslog if the DEBUG loglevel and journald are used.

Record: CVE-2020-13881
Updated: 2026-11-02

EUVDEUVD-2020-6089 No score

In support.c in pam_tacplus 1.3.8 through 1.5.1, the TACACS+ shared secret gets logged via syslog if the DEBUG loglevel and journald are used.

Record: EUVD-2020-6089
Updated: 2026-11-03

GitHub AdvisoriesGHSA-gm22-vmf2-hwxg 7.5

In support.c in pam_tacplus 1.3.8 through 1.5.1, the TACACS+ shared secret gets logged via syslog...

In support.c in pam_tacplus 1.3.8 through 1.5.1, the TACACS+ shared secret gets logged via syslog if the DEBUG loglevel and journald are used.

Record: GHSA-gm22-vmf2-hwxg
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness: CWE-532
Updated: 2026-11-02

OSV 7.5

In support.c in pam_tacplus 1.3.8 through 1.5.1, the TACACS+ shared secret gets logged via syslog if the DEBUG loglevel and journald are used.

Record: CVE-2020-13881
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated: 2026-11-02

OSVUBUNTU-CVE-2020-13881 7.5

In support.c in pam_tacplus 1.3.8 through 1.5.1, the TACACS+ shared secret gets logged via syslog if the DEBUG loglevel and journald are used.

Record: UBUNTU-CVE-2020-13881
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated: 2026-11-02

OSVUSN-4521-1 No score

libpam-tacplus vulnerability

It was discovered that pam_tacplus did not properly manage shared secrets if DEBUG loglevel and journald are used. A remote attacker could use this issue to expose sensitive information.

Record: USN-4521-1
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`libpam-tacplus` Debian:8	before 1.3.8-2+deb8u1, plus listed versions 1.3.8-2	1.3.8-2+deb8u1
`libpam-tacplus` Debian:9	before 1.3.8-2+deb9u1, plus listed versions 1.3.8-2	1.3.8-2+deb9u1
`libpam-tacplus` Ubuntu:16.04:LTS	before 1.3.8-2+deb8u1build0.16.04.1, plus listed versions 1.3.8-2	1.3.8-2+deb8u1build0.16.04.1
`libpam-tacplus` Ubuntu:18.04:LTS	before 1.3.8-2+deb8u1build0.18.04.1, plus listed versions 1.3.8-2	1.3.8-2+deb8u1build0.18.04.1
`libpam-tacplus` Ubuntu:20.04:LTS	before 1.3.8-2+deb8u1build0.20.04.1, plus listed versions 1.3.8-2	1.3.8-2+deb8u1build0.20.04.1
`libpam-tacplus` Ubuntu:22.04:LTS	All versions, plus listed versions 1.3.8-2.1	None known

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

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

In short

CVE-2020-13881 is a high vulnerability (CVSS 7.5) in Pam Tacplus Project Tacplus, published June 6, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.71%, the 77th percentile. Fixed in libpam-tacplus 1.3.8-2+deb8u1.

References

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