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CVE record · CVE-2026-20349

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

CVSS 8.6 HighCriticalIn CISA KEVEPSS 0.010 · 63rd percentile

Critical, because:

  • In CISA’s KEV catalogue since 11 Aug 2026: it is known to be exploited.

How we decide what’s critical

Published by the CVE Program (CNA: cisco) at 11 Aug 2026, 17:06 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software
  • affected 9.16.1
  • affected 9.16.1.28
  • affected 9.16.2
  • affected 9.16.2.3
  • affected 9.16.2.7
  • affected 9.16.2.11
  • affected 9.16.2.13
  • affected 9.16.2.14
  • affected 9.16.3.3
  • affected 9.16.3
  • affected 9.16.3.14
  • affected 9.18.1
  • and 120 more
Other versions: unknown
Cisco Cisco Secure Firewall Threat Defense (FTD) Software
  • affected 7.0.0
  • affected 7.0.0.1
  • affected 7.0.1
  • affected 7.0.1.1
  • affected 7.0.2
  • affected 7.2.0
  • affected 7.0.2.1
  • affected 7.0.3
  • affected 7.2.0.1
  • affected 7.0.4
  • affected 7.2.1
  • affected 7.0.5
  • and 49 more
Other versions: unknown
Identifiers
CVE-2026-20349
CNA
cisco
Weakness (CWE)
CWE-244
Tags
Published
11 Aug 2026
Updated
16 Sept 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.6 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H CNA (cisco)
  • CISA KEV Listed since 11 Aug 2026: known to be exploited.
  • EPSS 0.010, the 63rd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 11 Aug 2026. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.