Cisco Bug: CSCul68246 - ASA TCP Normalizer does not handle OOO TCP ACKs to the box
Nov 27, 2020
- Cisco Adaptive Security Appliance (ASA) Software
Known Affected Releases
8.4 9.0 9.1
Symptom: Bad retransmissions from the ASA (to the box traffic) those retransmissions are triggered by an OOO TCP ACK. Conditions: -- ASA configured with a TCP server (HTTPS, SSH, Telnet). -- Client communicating with the ASA through a Device that is monitoring TCP retransmissions. -- TCP ACKs are not delivered in order.
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