Resource exhaustion in Cisco Adaptive_security_appliance_software
CVE-2026-20103
A vulnerability in the Remote Access SSL VPN functionality of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to exhaust dev…
EPSS: 0.004 (27.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.
Affected products
- Cisco Adaptive_security_appliance_software
- Cisco Secure Firewall Adaptive Security Appliance (Asa) Software — versions 9.12.4.48, 9.12.4.50, 9.12.4.52
- Cisco Secure Firewall Threat Defense (Ftd) Software — versions 6.4.0.16, 6.4.0.17, 6.4.0.18
- Cisco Firepower_threat_defense_software
Weakness classification (CWE)
References
- psirt@cisco.com (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-20103?
- CVE-2026-20103 is a high-severity vulnerability in Cisco Adaptive_security_appliance_software, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 8.6/10. Published 2026-03-04.
- How severe is CVE-2026-20103?
- High severity. CVSS v3 base score is 8.6 out of 10.