CVE-2024-20439

CRITICALNVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2025-03-31), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 9.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 4 sources updated this weekExploited in the wild
9.8
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 92%CVSS: 9.8Exploit: NoneExposed: 0

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

A vulnerability in Cisco Smart Licensing Utility (CSLU) could allow an unauthenticated, remote attacker to log into an affected system by using a static administrative credential. This vulnerability is due to an undocumented static user credential for an administrative account. An attacker could exploit this vulnerability by using the static credentials to login to the affected system. A successful exploit could allow the attacker to login to the affected system with administrative rights over the CSLU application API.

CVSS v3
9.8
EG Score
9.8(high)
EPSS
99.8%
KEV
⚠ Exploited

Published

September 4, 2024

Last Modified

October 28, 2025

Advisory Details (2)

Auto-updated Jun 1, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-20439
generic

Cisco Smart Licensing Utility Vulnerabilities

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cslu-7gHMzWmw

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 53× in last 7d / 206× 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.

Showing the most recent 100 of 375 total refreshes for this CVE.

  1. 2026-07-22 20:14 UTCGHSA enrichment
  2. 2026-07-22 19:40 UTCCISA KEV update
  3. 2026-07-22 16:07 UTCEG score recompute
  4. 2026-07-22 16:06 UTCGHSA enrichment
  5. 2026-07-22 14:07 UTCEPSS rescore
  6. 2026-07-22 11:53 UTCGHSA enrichment
  7. 2026-07-22 07:45 UTCGHSA enrichment
  8. 2026-07-22 03:37 UTCGHSA enrichment
  9. 2026-07-21 23:29 UTCGHSA enrichment
  10. 2026-07-21 17:53 UTCEG score recompute
  11. 2026-07-21 17:53 UTCGHSA enrichment
  12. 2026-07-21 15:23 UTCEPSS rescore
  13. 2026-07-21 15:23 UTCEPSS rescore
  14. 2026-07-21 14:37 UTCCISA KEV update
  15. 2026-07-21 13:43 UTCGHSA enrichment
  16. 2026-07-21 09:34 UTCGHSA enrichment
  17. 2026-07-21 05:25 UTCGHSA enrichment
  18. 2026-07-21 01:17 UTCGHSA enrichment
  19. 2026-07-20 21:10 UTCEG score recompute
  20. 2026-07-20 21:10 UTCGHSA enrichment
  21. 2026-07-20 17:06 UTCEPSS rescore
  22. 2026-07-20 17:01 UTCGHSA enrichment
  23. 2026-07-20 12:52 UTCGHSA enrichment
  24. 2026-07-20 08:44 UTCGHSA enrichment
  25. 2026-07-20 04:37 UTCGHSA enrichment
Show 75 more
  1. 2026-07-19 20:21 UTCGHSA enrichment
  2. 2026-07-19 16:14 UTCGHSA enrichment
  3. 2026-07-19 12:00 UTCGHSA enrichment
  4. 2026-07-19 07:53 UTCGHSA enrichment
  5. 2026-07-19 03:45 UTCEG score recompute
  6. 2026-07-19 03:45 UTCGHSA enrichment
  7. 2026-07-19 02:28 UTCEPSS rescore
  8. 2026-07-19 02:28 UTCEPSS rescore
  9. 2026-07-18 23:37 UTCGHSA enrichment
  10. 2026-07-18 19:30 UTCGHSA enrichment
  11. 2026-07-18 15:21 UTCGHSA enrichment
  12. 2026-07-18 11:14 UTCGHSA enrichment
  13. 2026-07-18 07:06 UTCGHSA enrichment
  14. 2026-07-18 02:58 UTCGHSA enrichment
  15. 2026-07-17 22:50 UTCGHSA enrichment
  16. 2026-07-17 18:42 UTCGHSA enrichment
  17. 2026-07-17 14:34 UTCGHSA enrichment
  18. 2026-07-17 10:26 UTCEG score recompute
  19. 2026-07-17 10:26 UTCGHSA enrichment
  20. 2026-07-17 06:18 UTCGHSA enrichment
  21. 2026-07-17 02:10 UTCGHSA enrichment
  22. 2026-07-16 22:02 UTCGHSA enrichment
  23. 2026-07-16 17:54 UTCGHSA enrichment
  24. 2026-07-16 17:04 UTCCISA KEV update
  25. 2026-07-16 13:46 UTCGHSA enrichment
  26. 2026-07-16 09:38 UTCGHSA enrichment
  27. 2026-07-16 05:31 UTCGHSA enrichment
  28. 2026-07-16 01:23 UTCGHSA enrichment
  29. 2026-07-15 21:14 UTCGHSA enrichment
  30. 2026-07-15 17:06 UTCGHSA enrichment
  31. 2026-07-15 16:56 UTCEPSS rescore
  32. 2026-07-15 16:56 UTCEPSS rescore
  33. 2026-07-15 16:49 UTCCISA KEV update
  34. 2026-07-15 15:04 UTCCISA KEV update
  35. 2026-07-15 12:57 UTCGHSA enrichment
  36. 2026-07-15 08:50 UTCGHSA enrichment
  37. 2026-07-15 04:41 UTCGHSA enrichment
  38. 2026-07-15 00:33 UTCGHSA enrichment
  39. 2026-07-14 20:24 UTCGHSA enrichment
  40. 2026-07-14 18:05 UTCCISA KEV update
  41. 2026-07-14 16:16 UTCGHSA enrichment
  42. 2026-07-14 12:08 UTCGHSA enrichment
  43. 2026-07-14 08:00 UTCGHSA enrichment
  44. 2026-07-14 03:51 UTCGHSA enrichment
  45. 2026-07-13 23:43 UTCGHSA enrichment
  46. 2026-07-13 19:34 UTCGHSA enrichment
  47. 2026-07-13 17:07 UTCCISA KEV update
  48. 2026-07-13 15:25 UTCGHSA enrichment
  49. 2026-07-13 11:17 UTCGHSA enrichment
  50. 2026-07-13 07:09 UTCGHSA enrichment
  51. 2026-07-13 03:01 UTCGHSA enrichment
  52. 2026-07-12 22:51 UTCGHSA enrichment
  53. 2026-07-12 18:43 UTCGHSA enrichment
  54. 2026-07-12 14:35 UTCGHSA enrichment
  55. 2026-07-12 10:28 UTCGHSA enrichment
  56. 2026-07-12 06:20 UTCGHSA enrichment
  57. 2026-07-12 02:11 UTCGHSA enrichment
  58. 2026-07-11 22:03 UTCGHSA enrichment
  59. 2026-07-11 17:55 UTCGHSA enrichment
  60. 2026-07-11 13:47 UTCGHSA enrichment
  61. 2026-07-11 09:39 UTCGHSA enrichment
  62. 2026-07-11 05:31 UTCGHSA enrichment
  63. 2026-07-11 01:23 UTCGHSA enrichment
  64. 2026-07-10 21:15 UTCGHSA enrichment
  65. 2026-07-10 17:52 UTCCISA KEV update
  66. 2026-07-10 17:07 UTCGHSA enrichment
  67. 2026-07-10 12:57 UTCGHSA enrichment
  68. 2026-07-10 08:48 UTCGHSA enrichment
  69. 2026-07-10 04:40 UTCGHSA enrichment
  70. 2026-07-10 00:31 UTCGHSA enrichment
  71. 2026-07-09 20:21 UTCGHSA enrichment
  72. 2026-07-09 16:13 UTCGHSA enrichment
  73. 2026-07-09 12:04 UTCGHSA enrichment
  74. 2026-07-09 07:56 UTCGHSA enrichment
  75. 2026-07-09 03:47 UTCGHSA enrichment

Publicly available exploits

(1 reference)

Working exploit code is in the public domain. Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Nucleihttp/cves/2024/CVE-2024-20439.yaml
    First seen Jan 1, 2024

    Hardcoded Admin Credentials For Cisco Smart Licensing Utility API

    Open source ↗

Frequently asked(6)

What is CVE-2024-20439?
CVE-2024-20439 is a critical vulnerability published on September 4, 2024. A vulnerability in Cisco Smart Licensing Utility (CSLU) could allow an unauthenticated, remote attacker to log into an affected system by using a static administrative credential. This vulnerability is due to an undocumented static user credential for an administrative account. An attacker could…
When was CVE-2024-20439 disclosed?
CVE-2024-20439 was first published in the National Vulnerability Database on September 4, 2024, with the most recent update on October 28, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2024-20439 actively exploited?
Yes. CISA added CVE-2024-20439 to the Known Exploited Vulnerabilities catalog on March 31, 2025, affecting Cisco Smart Licensing Utility. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2024-20439?
CVE-2024-20439 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2024-20439?
CVE-2024-20439 affects Cisco Smart Licensing Utility. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2024-20439?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-20439, 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.

Dependency Blast Radius

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