CVE-2023-45239

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 28.7%, top 3% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 2%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
76.4%
KEV
Not listed

Published

October 6, 2023

Last Modified

June 17, 2026

Advisory Details (3)

Auto-updated Jun 24, 2026
Patch available. Sources: github_pr, github.
generic

[SECURITY] Fedora 39 Update: tacacs-F4.0.4.28.7fb~20231005g4fdf178-1.fc39 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/X4J7ZYMFZB4G4OU5EDJPQLP6F6RKDGIH/
github Patch Available

tac_plus pre auth remote command execution · Advisory · facebook/tac_plus · GitHub

https://github.com/facebook/tac_plus/security/advisories/GHSA-p334-5r3g-4vx3
github_pr

Author data validation

Fix merged in facebook/tac_plus PR #41 on 2023-10-05 — awaiting tagged release

https://github.com/facebook/tac_plus/pull/41

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 45× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-22 14:06 UTCEPSS rescore
  2. 2026-07-21 15:23 UTCEPSS rescore
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  4. 2026-07-20 17:06 UTCEPSS rescore
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  24. 2026-07-07 13:44 UTCEPSS rescore
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  1. 2026-07-06 16:26 UTCEPSS rescore
  2. 2026-07-06 02:22 UTCEPSS rescore
  3. 2026-07-05 02:29 UTCEPSS rescore
  4. 2026-07-04 06:29 UTCEPSS rescore
  5. 2026-07-01 15:05 UTCEPSS rescore
  6. 2026-06-30 23:21 UTCEPSS rescore
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  8. 2026-06-29 14:05 UTCEPSS rescore
  9. 2026-06-28 14:06 UTCEPSS rescore
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  11. 2026-06-28 04:55 UTCEPSS rescore
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  17. 2026-06-24 14:04 UTCEPSS rescore
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  19. 2026-06-23 21:31 UTCEPSS rescore
  20. 2026-06-23 21:31 UTCEPSS rescore
  21. 2026-06-22 14:24 UTCEPSS rescore
  22. 2026-06-22 14:24 UTCEPSS rescore
  23. 2026-06-21 14:55 UTCEPSS rescore
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  25. 2026-06-21 01:58 UTCEPSS rescore
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  27. 2026-06-19 19:24 UTCEPSS rescore
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  29. 2026-06-18 17:51 UTCEPSS rescore
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  36. 2026-06-14 23:16 UTCEPSS rescore
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  39. 2026-06-12 23:10 UTCEPSS rescore
  40. 2026-06-12 23:10 UTCEPSS rescore
  41. 2026-06-11 13:59 UTCEPSS rescore
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  43. 2026-06-10 22:17 UTCEPSS rescore
  44. 2026-06-10 13:21 UTCEPSS rescore
  45. 2026-06-10 13:21 UTCEPSS rescore
  46. 2026-06-06 13:46 UTCEPSS rescore
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  48. 2026-06-05 22:46 UTCEPSS rescore
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  50. 2026-06-04 13:11 UTCEPSS rescore
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  52. 2026-06-02 20:12 UTCEPSS rescore
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  54. 2026-06-01 13:51 UTCEPSS rescore
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  56. 2026-05-31 22:30 UTCEPSS rescore
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  60. 2026-05-29 13:43 UTCEPSS rescore
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  67. 2026-05-26 13:43 UTCEPSS rescore
  68. 2026-05-24 16:23 UTCEG score recompute

Frequently asked(5)

What is CVE-2023-45239?
CVE-2023-45239 is a critical vulnerability published on October 6, 2023. A lack of input validation exists in tacplus 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 tacplus to inject shell commands and gain remote code execution on the tac_plus server.
When was CVE-2023-45239 disclosed?
CVE-2023-45239 was first published in the National Vulnerability Database on October 6, 2023, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-45239 actively exploited?
CVE-2023-45239 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 76.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-45239?
CVE-2023-45239 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2023-45239?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-45239, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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