Cisco Firewall Services Module (FWSM) Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a reload of an affected system.

The vulnerability is due to a race condition when releasing the memory allocated by the cut-through proxy function.

An attacker could exploit this vulnerability by sending traffic to match the condition that triggers cut-through proxy authentication.

Cisco has released free software updates that address this vulnerability. Workarounds that mitigate the vulnerability are not available.

This advisory is available at the following link:

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