CVE-2023-45239

Name: CVE-2023-45239
Creator: NVD / NIST
Published: 2023-10-06T18:15:12.337+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.81%

Last modified Jun 17, 2026

CVE-2023-45239 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A lack of input validation exists in tac_plus prior to commit 4fdf178 which, when pre or post auth commands are enabled, allows an attacker who can control the username, rem-addr, or NAC address sent to tac_plus to inject shell commands and gain remote code execution on the tac_plus server.. EPSS estimates a 1.81% chance of exploitation in the next 30 days.

Description

A lack of input validation exists in tac_plus prior to commit 4fdf178 which, when pre or post auth commands are enabled, allows an attacker who can control the username, rem-addr, or NAC address sent to tac_plus to inject shell commands and gain remote code execution on the tac_plus server.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.81%

75.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-790

Affected Software

Vendor	Product	Versions
Facebook	Tac Plus	< 2023-10-05
Fedoraproject	Fedora	39

References

https://github.com/facebook/tac_plus/pull/41Exploit, Patch
https://github.com/facebook/tac_plus/security/advisories/GHSA-p334-5r3g-4vx3Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/X4J7ZYMFZB4G4OU5EDJPQLP6F6RKDGIH/Mailing List, Third Party Advisory
https://github.com/facebook/tac_plus/pull/41Exploit, Patch
https://github.com/facebook/tac_plus/security/advisories/GHSA-p334-5r3g-4vx3Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/X4J7ZYMFZB4G4OU5EDJPQLP6F6RKDGIH/Mailing List, Third Party Advisory

Timeline

Published: Oct 6, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-45239?

How severe is CVE-2023-45239?

CVE-2023-45239 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.81% probability of exploitation in the next 30 days.

How do I fix CVE-2023-45239?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-45239?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST