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CVE-2026-20349

Severity8.6 High CVSS 3.1
WeaknessCWE-244
Published11 Aug 2026
Updated26 Oct 2026

Description

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.

Exploitation status

Exploited

Confirmed real-world exploitation.

  • CISA KEV listed Confirmed exploitation in the wild. Added 2026-08-11 · remediation due 2026-08-14 · ransomware use: unknown
  • VulnCheck KEV listed Exploitation reported in the wild. 7 citations · earliest 2026-08-11.
  • CISA Vulnrichment exploitation: active CISA records active exploitation. Automatable: yes, technical impact: partial.
  • Indexed PoC 1 indexed, none at 5+ stars
  • EPSS 1.0% chance in 30 days

VulnCheck KEV

Exploitation evidence from VulnCheck Known Exploited Vulnerabilities (VulnCheck KEV), used under VulnCheck's community terms. View CVE-2026-20349 in VulnCheck (free account), which lists 2 more citations not shown here.

EvidenceSourceDetailDate
Reported exploitation previdian.com /CVE-2026-20349 2026-08-11
Reported exploitation sec.cloudapps.cisco.com /security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-dos-dzv4mQFF 2026-08-11
Reported exploitation cisa.gov /sites/default/files/feeds/known_exploited_vulnerabilities.json 2026-08-11
Reported exploitation hkcert.org /security-bulletin/cisco-products-multiple-vulnerabilities_20260812 2026-08-12
Reported exploitation eclypsium.com /blog/cve-2026-20349-someone-is-crashing-cisco-firewalls-we-need-to-talk-about-why 2026-08-19

1 of these are GitHub repositories with fewer than 5 stars. They are listed for reference and don't count toward the exploitation status above.

IndexArtifactStarsFirst seen
GitHub PoC Panduan Praktikum Edukasi: Deteksi Versi Cisco ASA & FTD (CVE-2026-20349) 1 2026-10-18

Waratek protection

Outside Waratek scope

A Java vulnerability, but not one Waratek protects. It affects only Java on a user's desktop (applets, Web Start, JavaFX, the installer), sits in a product the Waratek agent can't be installed into, or is in a package we don't expect in business applications. The decision below says which.

  • Protection none
  • Action not pursued none
  • Review automated Upstream data
  • Record active
Decided by The only affected product being a sealed appliance image, where Java runs but no -javaagent can be attached
Finding This CVE names only products the Waratek agent cannot be installed into (cisco/secure_firewall_threat_defense). They ship as sealed appliance images or as native code with no application JVM, so there is no start-up line to add -javaagent to. The vulnerability may well be a Java one; it is permanently out of ARMR's reach rather than outside its subject.

Affected software and releases

Products and versions

2 products, 197 version entries
SourceVendorProductSchemeAffected versions
nvd cisco adaptive security appliance software generic 9.16.1 · 9.16.1.28 · 9.16.2 · 9.16.2.3 · 9.16.2.7 · 9.16.2.11 · 9.16.2.13 · 9.16.2.14 · 9.16.3 · 9.16.3.3 · 9.16.3.14 · 9.16.3.15 · 9.16.3.19 · 9.16.3.23 · 9.16.4 · 9.16.4.9 · 9.16.4.14 · 9.16.4.19 · 9.16.4.27 · 9.16.4.38 · 9.16.4.39 · 9.16.4.42 · 9.16.4.48 · 9.16.4.55 · 9.16.4.57 · 9.16.4.61 · 9.16.4.62 · 9.16.4.67 · 9.16.4.70 · 9.16.4.71 · 9.16.4.76 · 9.16.4.82 · 9.16.4.84 · 9.16.4.85 · 9.16.4.89 · 9.16.4.92 · 9.18.1 · 9.18.1.3 · 9.18.2 · 9.18.2.5 · 9.18.2.7 · 9.18.2.8 · 9.18.3 · 9.18.3.39 · 9.18.3.46 · 9.18.3.53 · 9.18.3.55 · 9.18.3.56 · 9.18.4 · 9.18.4.5 · 9.18.4.8 · 9.18.4.22 · 9.18.4.24 · 9.18.4.29 · 9.18.4.34 · 9.18.4.40 · 9.18.4.47 · 9.18.4.50 · 9.18.4.52 · 9.18.4.53 · 9.18.4.57 · 9.18.4.66 · 9.18.4.67 · 9.18.4.68 · 9.18.4.71 · 9.18.4.76 · 9.18.4.82 · 9.18.4.90 · 9.18.4.135 · 9.19.1 · 9.19.1.5 · 9.19.1.9 · 9.19.1.12 · 9.19.1.18 · 9.19.1.22 · 9.19.1.24 · 9.19.1.27 · 9.19.1.28 · 9.19.1.31 · 9.19.1.37 · 9.19.1.38 · 9.19.1.42 · 9.20.1 · 9.20.1.5 · 9.20.2 · 9.20.2.10 · 9.20.2.21 · 9.20.2.22 · 9.20.3 · 9.20.3.4 · 9.20.3.7 · 9.20.3.9 · 9.20.3.10 · 9.20.3.13 · 9.20.3.16 · 9.20.3.20 · 9.20.4 · 9.20.4.7 · 9.20.4.10 · 9.20.4.14 · 9.20.4.19 · 9.20.4.22 · 9.20.4.28 · 9.20.4.30 · 9.20.4.34 · 9.20.4.46 · 9.22.1.1 · 9.22.1.2 · 9.22.1.3 · 9.22.1.6 · 9.22.2 · 9.22.2.4 · 9.22.2.9 · 9.22.2.13 · 9.22.2.14 · 9.22.2.20 · 9.22.2.32 · 9.22.3 · 9.22.3.5 · 9.23.1 · 9.23.1.3 · 9.23.1.7 · 9.23.1.13 · 9.23.1.19 · 9.23.1.22 · 9.23.1.26 · 9.23.1.32 · 9.23.1.195 · 9.24.1 · 9.24.1.5 · 9.24.1.9 · 9.24.1.11 · 9.24.1.155
nvd cisco secure firewall threat defense generic 7.0.0 · 7.0.0.1 · 7.0.1 · 7.0.1.1 · 7.0.2 · 7.0.2.1 · 7.0.3 · 7.0.4 · 7.0.5 · 7.0.6 · 7.0.6.1 · 7.0.6.2 · 7.0.6.3 · 7.0.7 · 7.0.8 · 7.0.8.1 · 7.0.9 · 7.2.0 · 7.2.0.1 · 7.2.1 · 7.2.2 · 7.2.3 · 7.2.4 · 7.2.4.1 · 7.2.5 · 7.2.5.1 · 7.2.5.2 · 7.2.6 · 7.2.7 · 7.2.8 · 7.2.8.1 · 7.2.9 · 7.2.10 · 7.2.10.2 · 7.2.11 · 7.2.12 · 7.3.0 · 7.3.1 · 7.3.1.1 · 7.3.1.2 · 7.4.0 · 7.4.1 · 7.4.1.1 · 7.4.2 · 7.4.2.1 · 7.4.2.2 · 7.4.2.3 · 7.4.2.4 · 7.4.3 · 7.4.4 · 7.4.7 · 7.4.8 · 7.6.0 · 7.6.1 · 7.6.2 · 7.6.2.1 · 7.6.4 · 7.7.0 · 7.7.10 · 7.7.10.1 · 7.7.11 · 7.7.13 · 10.0.0 · 10.0.2

References

URLTags
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-dos-dzv4mQFF
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20349 US Government Resource

Timeline

Published2026-08-11By the CVE Program.
Added to CISA KEV2026-08-11Listed in CISA's Known Exploited Vulnerabilities catalog.
VulnCheck KEV: earliest evidence2026-08-11Date of the oldest evidence of exploitation in VulnCheck KEV's record. VulnCheck does not publish the date it listed the CVE.
VulnCheck KEV: latest evidence2026-09-08Date of the newest report, exploit reference or honeypot sighting in VulnCheck KEV's record.
NVD record modified2026-10-26NVD's own last-modified date for this record.