CVE-2025-20333

CRITICALNVD 9.99.9—
EchelonGraph scoreHIGH confidence

Score elevated to 9.9 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2025-09-25), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 9.9 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 3 sources updated this weekExploited in the wild
9.9EG
EchelonGraph verdictMitigate nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 71%CVSS: 9.9Exploit: cisa kev · ssvc active · epss top5pct · epss highExposed services: Not assessed

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

A vulnerability in the VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, remote attacker to execute arbitrary code on an affected device. This vulnerability is due to improper validation of user-supplied input in HTTP(S) requests. An attacker with valid VPN user credentials could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute arbitrary code as root, possibly resulting in the complete compromise of the affected device.

CVSS v3
9.9
EG Score
9.9CRITICALhigh confidence
EG Risk
85
EG Risk 85/100CISA SSVC

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
Severity99% × 45%
Exploitation100% × 40%
Automatability0% × 15%
CISA SSVC: Track at low, Attend at medium and Act at high mission impact.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low, sooner than that at medium and as soon as possible at high mission impact, and watch the vendor's advisory for the fix.
EPSS PROB
71%
EPSS %ILE
99th
KEV
⚠ Exploited

CISA SSVCTrack at low, Attend at medium and Act at high mission impact.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low, sooner than that at medium and as soon as possible at high mission impact, and watch the vendor's advisory for the fix.

Exploitation active (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 25, 2025

Last Modified

August 11, 2026

Advisory Details (3)

Auto-updated Oct 7, 2026
⚠️ Active exploitation confirmed. No fix on record yet. Sources: cisa.
cisa🔴 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-2025-20333
generic

Cisco Event Response: Continued Attacks Against Cisco Firewalls

https://sec.cloudapps.cisco.com/security/center/resources/asa_ftd_continued_attacks
generic

Cisco Secure Firewall Adaptive Security Appliance Software and Secure Firewall Threat Defense Software VPN Web Server Remote Code Execution Vulnerability

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-webvpn-z5xP8EUB

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 47× in last 7d / 222× 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 997 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2025-20333?
CVE-2025-20333 is a critical vulnerability published on September 25, 2025. A vulnerability in the VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, remote attacker to execute arbitrary code on an affected device. This vulnerability is due to improper…
When was CVE-2025-20333 disclosed?
CVE-2025-20333 was first published on September 25, 2025, with the most recent update on August 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-20333 actively exploited?
Yes. CISA added CVE-2025-20333 to the Known Exploited Vulnerabilities catalog on September 25, 2025, affecting Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate attention. No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation, and watch the vendor's advisory for the fix.
What is the CVSS score of CVE-2025-20333?
CVE-2025-20333 has a CVSS v3 base score of 9.9 (NVD).
Which products are affected by CVE-2025-20333?
CVE-2025-20333 affects Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense.
How do I remediate CVE-2025-20333?
No fix for CVE-2025-20333 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix.

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