CVE-2026-20349 CISA KEV · Actively exploitedSuited to automated attack · CISA
Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Remote Access SSL VPN Denial of Service Vulnerability
CVSS score
8.6
EPSS probability
%1.0
Risk score
0.2
Published
2 mo ago
Vulnerability Timeline (Change History)
CVE-2026-20349 historical changes made to the vulnerability by NVD, CISA and MITRE:
| Date | Actor / Source | Action / Description | Type | Previous value | New value |
|---|---|---|---|---|---|
| 16.09.2026 | nvd@nist.gov | Initial Analysis & CVSS Vector Assignment | CVSS V3.1 | — | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H |
| 11.08.2026 | CISA Coordinator | Added to KEV Catalog (Active Exploitation) | SSVC / KEV | exploitation: none | exploitation: active |
| 11.08.2026 | MITRE / NVD | New CVE Record Received & Ingested | CVE Created | — | CVE-2026-20349 |
Similar Vulnerabilities
10.0
CVE-2021-44228 Actively exploitedImproper input validation in Apache Log4j
Patch verified Public Exploits:22EPSS %100
10.0
CVE-2026-20079 Actively exploitedCisco Secure Firewall Management Center Authentication Bypass Remote Code Execution Vulnerability
Workaround Public Exploits:3EPSS %88
8.6
CVE-2026-20230 Actively exploitedCisco Unified Communications Manager Server-Side Request Forgery Vulnerability
Workaround Public Exploits:1EPSS %88
7.5
CVE-2020-3452 Actively exploitedImproper input validation in Cisco Adaptive Security Appliance Software
Workaround Public Exploits:17EPSS %100
7.5
CVE-2018-0296 Actively exploitedImproper input validation in Cisco Firepower Threat Defense
Workaround Public Exploits:9EPSS %100
8.6
CVE-2025-20362 Actively exploitedMissing authorization in Cisco Secure Firewall Threat Defense
Workaround Public Exploits:1EPSS %87
Get this vulnerability through the API
Affected products, version ranges, exploitation status and patch information in a single request, with a free key.
curl -H "x-api-key: $DAYBREACH_API_KEY" \ "https://api.daybreach.dev/api/v1/intel/cves/CVE-2026-20349"