CVE-2024-20481

MEDIUMNVD 5.89.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2024-10-24), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 5.8 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
5.8
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 16%CVSS: 5.8Exploit: NoneExposed: 0

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

A vulnerability in the Remote Access VPN (RAVPN) service of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) of the RAVPN service. This vulnerability is due to resource exhaustion. An attacker could exploit this vulnerability by sending a large number of VPN authentication requests to an affected device. A successful exploit could allow the attacker to exhaust resources, resulting in a DoS of the RAVPN service on the affected device. Depending on the impact of the attack, a reload of the device may be required to restore the RAVPN service. Services that are not related to VPN are not affected. Cisco Talos discussed these attacks in the blog post Large-scale brute-force activity targeting VPNs, SSH services with commonly used login credentials.

CVSS v3
5.8
EG Score
9.0(high)
EG Risk
96(Attend)
EG Risk 96/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity90% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS
96.6%
KEV
⚠ Exploited

Published

October 23, 2024

Last Modified

October 28, 2025

Advisory Details (2)

Auto-updated Jun 13, 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-2024-20481
generic

Cisco Adaptive Security Appliance and Firepower Threat Defense Software Remote Access VPN Brute Force Denial of Service Vulnerability

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-bf-dos-vDZhLqrW

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 65× in last 7d / 256× 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 473 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2024-20481?
CVE-2024-20481 is a medium vulnerability published on October 23, 2024. A vulnerability in the Remote Access VPN (RAVPN) service of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) of the RAVPN service. This vulnerability is due to…
When was CVE-2024-20481 disclosed?
CVE-2024-20481 was first published in the National Vulnerability Database on October 23, 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-2024-20481 actively exploited?
Yes. CISA added CVE-2024-20481 to the Known Exploited Vulnerabilities catalog on October 24, 2024, affecting Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD). KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2024-20481?
CVE-2024-20481 has a CVSS v3 base score of 5.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2024-20481?
CVE-2024-20481 affects Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD). 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-2024-20481?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-20481, 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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