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CVE record · 1 source

CVE-2026-20248

Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software TCP DNS Denial of Service Vulnerability

Vendor: Cisco
Product: ASA, Firepower / FTD
Exposure class: Edge / VPN / firewall

Coverage

2

Every item in the archive that references this CVE, highest rank first. Headlines open the publisher.

31

Cisco advisory Cisco PSIRT 18 Sep 2026

Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software TCP DNS Denial of Service Vulnerability

A vulnerability in the DNS over TCP implementation of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to…

Fix available CVE-2026-20248 Cisco
26

Cisco advisory Cisco PSIRT 16 Sep 2026

Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software TCP DNS Denial of Service Vulnerability

A vulnerability in the DNS over TCP implementation of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to…

CVE-2026-20248 Cisco