Cisco patches critical FMC Java deserialization RCE flaw
Cisco disclosed CVE-2026-20242, a critical vulnerability in Secure Firewall Management Center Software's External Database Access feature. Insecure deserialization of a user-supplied Java byte stream lets an unauthenticated remote attacker execute arbitrary commands as root. Exploitation requires control of a host on the external database access list. Cisco released software updates; no workarounds exist.
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