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 — KEV-added this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 1%CVSS: 8.6Exploit: cisa kev · ssvc activeExposed: 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 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
9.0(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 PROB
1%
EPSS %ILE
56%
KEV
⚠ Exploited

Published

August 11, 2026

Last Modified

August 12, 2026

Advisory Details (1)

Auto-updated Aug 11, 2026
No patch confirmed 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 57× in last 7d / 92× 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.

  1. 2026-08-21 08:11 UTCGHSA enrichment
  2. 2026-08-21 04:05 UTCGHSA enrichment
  3. 2026-08-20 23:59 UTCEG score recompute
  4. 2026-08-20 23:59 UTCGHSA enrichment
  5. 2026-08-20 22:55 UTCEPSS rescore
  6. 2026-08-20 19:54 UTCGHSA enrichment
  7. 2026-08-20 17:06 UTCCISA KEV update
  8. 2026-08-20 15:47 UTCGHSA enrichment
  9. 2026-08-20 11:41 UTCGHSA enrichment
  10. 2026-08-20 07:34 UTCGHSA enrichment
  11. 2026-08-20 03:28 UTCGHSA enrichment
  12. 2026-08-19 23:22 UTCGHSA enrichment
  13. 2026-08-19 19:16 UTCEG score recompute
  14. 2026-08-19 19:16 UTCGHSA enrichment
  15. 2026-08-19 17:33 UTCCISA KEV update
  16. 2026-08-19 17:03 UTCEPSS rescore
  17. 2026-08-19 15:10 UTCGHSA enrichment
  18. 2026-08-19 11:05 UTCGHSA enrichment
  19. 2026-08-19 06:59 UTCGHSA enrichment
  20. 2026-08-19 02:53 UTCGHSA enrichment
  21. 2026-08-18 22:47 UTCGHSA enrichment
  22. 2026-08-18 18:42 UTCGHSA enrichment
  23. 2026-08-18 16:58 UTCCISA KEV update
  24. 2026-08-18 14:36 UTCEG score recompute
  25. 2026-08-18 14:35 UTCGHSA enrichment
Show 67 more
  1. 2026-08-18 13:48 UTCEPSS rescore
  2. 2026-08-18 10:28 UTCGHSA enrichment
  3. 2026-08-18 06:22 UTCGHSA enrichment
  4. 2026-08-18 02:16 UTCGHSA enrichment
  5. 2026-08-17 22:08 UTCGHSA enrichment
  6. 2026-08-17 18:02 UTCGHSA enrichment
  7. 2026-08-17 13:56 UTCCISA KEV update
  8. 2026-08-17 13:55 UTCGHSA enrichment
  9. 2026-08-17 09:50 UTCGHSA enrichment
  10. 2026-08-17 05:44 UTCGHSA enrichment
  11. 2026-08-17 01:39 UTCGHSA enrichment
  12. 2026-08-16 21:33 UTCGHSA enrichment
  13. 2026-08-16 17:27 UTCEG score recompute
  14. 2026-08-16 17:27 UTCGHSA enrichment
  15. 2026-08-16 14:56 UTCEPSS rescore
  16. 2026-08-16 13:21 UTCGHSA enrichment
  17. 2026-08-16 09:15 UTCGHSA enrichment
  18. 2026-08-16 05:10 UTCEG score recompute
  19. 2026-08-16 05:10 UTCGHSA enrichment
  20. 2026-08-16 02:14 UTCEPSS rescore
  21. 2026-08-16 01:04 UTCGHSA enrichment
  22. 2026-08-15 20:58 UTCGHSA enrichment
  23. 2026-08-15 16:52 UTCGHSA enrichment
  24. 2026-08-15 12:46 UTCGHSA enrichment
  25. 2026-08-15 08:40 UTCGHSA enrichment
  26. 2026-08-15 04:34 UTCEG score recompute
  27. 2026-08-15 04:34 UTCGHSA enrichment
  28. 2026-08-15 01:30 UTCEPSS rescore
  29. 2026-08-15 00:28 UTCGHSA enrichment
  30. 2026-08-14 20:23 UTCGHSA enrichment
  31. 2026-08-14 16:17 UTCGHSA enrichment
  32. 2026-08-14 12:11 UTCGHSA enrichment
  33. 2026-08-14 08:06 UTCGHSA enrichment
  34. 2026-08-14 04:00 UTCGHSA enrichment
  35. 2026-08-13 23:55 UTCEG score recompute
  36. 2026-08-13 23:55 UTCGHSA enrichment
  37. 2026-08-13 22:00 UTCEPSS rescore
  38. 2026-08-13 19:49 UTCGHSA enrichment
  39. 2026-08-13 15:43 UTCGHSA enrichment
  40. 2026-08-13 11:37 UTCGHSA enrichment
  41. 2026-08-13 07:32 UTCGHSA enrichment
  42. 2026-08-13 03:26 UTCGHSA enrichment
  43. 2026-08-12 23:21 UTCGHSA enrichment
  44. 2026-08-12 19:15 UTCGHSA enrichment
  45. 2026-08-12 15:10 UTCEG score recompute
  46. 2026-08-12 15:10 UTCGHSA enrichment
  47. 2026-08-12 13:50 UTCEPSS rescore
  48. 2026-08-12 13:41 UTCGHSA enrichment
  49. 2026-08-12 09:35 UTCGHSA enrichment
  50. 2026-08-12 05:29 UTCEG score recompute
  51. 2026-08-12 05:29 UTCGHSA enrichment
  52. 2026-08-12 04:19 UTCEG score recompute
  53. 2026-08-12 04:19 UTCGHSA enrichment
  54. 2026-08-12 00:24 UTCGHSA enrichment
  55. 2026-08-11 20:19 UTCEG score recompute
  56. 2026-08-11 20:19 UTCGHSA enrichment
  57. 2026-08-11 19:51 UTCEG score recompute
  58. 2026-08-11 19:51 UTCGHSA enrichment
  59. 2026-08-11 19:32 UTCEG score recompute▲ 0.40
  60. 2026-08-11 19:32 UTCGHSA enrichment
  61. 2026-08-11 19:32 UTCCISA KEV update
  62. 2026-08-11 18:56 UTCGHSA enrichment
  63. 2026-08-11 18:39 UTCEG score recompute
  64. 2026-08-11 18:39 UTCGHSA enrichment
  65. 2026-08-11 17:39 UTCEG score recompute
  66. 2026-08-11 17:13 UTCEG score recompute
  67. 2026-08-11 17:11 UTCMITRE cvelistV5first tracked

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 in the National Vulnerability Database on August 11, 2026, with the most recent update on August 12, 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 patching attention.
What is the CVSS score of CVE-2026-20349?
CVE-2026-20349 has a CVSS v3 base score of 8.6 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
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) . 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-2026-20349?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-20349, 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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