CVE-2026-20349

CRITICALPre-NVD 8.69.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-08-11), indicating real-world exploitation has been confirmed by US federal agencies. A secondary CVSS source baseline 8.6 retained for reference (NVD's own analysis pending). Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, secondary
Trending — 3 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictMitigate nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 1.0%CVSS: 8.6Exploit: cisa kev · ssvc activeExposed 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 Remote Access SSL VPN service for Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition.  This vulnerability is due to insufficient error checking when processing HTTP requests. An attacker could exploit this vulnerability by sending a crafted HTTP request to the Remote Access SSL VPN service on an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.

CVSS v3
8.6
EG Score
9.0CRITICALhigh confidence
EG Risk
96
EG Risk 96/100CISA 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
Severity90% × 45%
Exploitation100% × 40%
Automatability100% × 15%
CISA SSVC: Attend at low or medium mission impact; Act at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation sooner than your standard update timelines at low or medium mission impact and as soon as possible at high, and watch the vendor's advisory for the fix.
EPSS PROB
1.0%
EPSS %ILE
61st
KEV
⚠ Exploited

CISA SSVCAttend at low or medium mission impact; Act at high (mission-essential systems).

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

Exploitation active (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (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

August 11, 2026

Last Modified

September 16, 2026

Advisory Details (1)

Auto-updated Aug 11, 2026
No fix on record yet.
generic

Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Remote Access SSL VPN Denial of Service Vulnerability

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-dos-dzv4mQFF

Vendor Advisories for CVE-2026-20349(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 51× in last 7d / 237× 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 470 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2026-20349?
CVE-2026-20349 is a critical vulnerability published on August 11, 2026. A vulnerability in the Remote Access SSL VPN service for Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of…
When was CVE-2026-20349 disclosed?
CVE-2026-20349 was first published on August 11, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-20349 actively exploited?
Yes. CISA added CVE-2026-20349 to the Known Exploited Vulnerabilities catalog on August 11, 2026, affecting Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) . 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-2026-20349?
CVE-2026-20349 has a CVSS base score of 8.6 (a secondary CVSS source that NVD displays; NVD's own analysis pending). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0 (CRITICAL).
Which products are affected by CVE-2026-20349?
CVE-2026-20349 affects Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) .
How do I remediate CVE-2026-20349?
No fix for CVE-2026-20349 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. The vendor advisories EchelonGraph has for CVE-2026-20349 are linked in the Vendor Advisories panel on this page.

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