Cisco patches ASA and FTD TCP DNS denial-of-service flaw
Cisco disclosed CVE-2026-20248, a logic error in DNS over TCP parsing in Secure Firewall ASA and Threat Defense software. An unauthenticated remote attacker who can respond to the device's DNS queries, via a controlled DNS service or machine-in-the-middle, could crash the TCP DNS response handler and reload the device, causing denial of service. Cisco released fixes; no workarounds exist.
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