September 13, 2023 · Applied Cybernetics Group
CVE-2023-20269 — Cisco Adaptive Security Appliance and Firepower Threat Defense
known ransomware use
Cisco Adaptive Security Appliance and Firepower Threat Defense Unauthorized Access Vulnerability
- Added to KEV
2023-09-13- Federal due date
2023-10-04- Vendor
- Cisco
- Product
- Adaptive Security Appliance and Firepower Threat Defense
- EPSS
- 97.3th percentile (score 0.216, as of
2026-07-13) - NVD CVSS v3.1
- —
- Ransomware use
- Known
- ATT&CK
- T1078 , T1133 · signal rollup
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2023-20269
CISA short description
Cisco Adaptive Security Appliance and Firepower Threat Defense contain an unauthorized access vulnerability that could allow an unauthenticated, remote attacker to conduct a brute force attack in an attempt to identify valid username and password combinations or establish a clientless SSL VPN session with an unauthorized user.
Required action
Apply mitigations per vendor instructions for group-lock and vpn-simultaneous-logins or discontinue use of the product for unsupported devices.