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 — 4 sources updated this weekExploited in the wild
9.9EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 40%CVSS: 9.9Exploit: cisa kev · ssvc active · epss top5pctExposed: 0

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

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
9.9(high)
EG Risk
85(Attend)
EG Risk 85/100SSVC: 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
Severity99% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
40%
EPSS %ILE
99%
KEV
⚠ Exploited

Published

September 25, 2025

Last Modified

October 28, 2025

Advisory Details (3)

Auto-updated Aug 3, 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-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 54× in last 7d / 225× 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 518 total refreshes for this CVE.

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

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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 in the National Vulnerability Database on September 25, 2025, 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-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 patching attention.
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. 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-2025-20333?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-20333, 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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