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Cisco Bug: CSCul68246 - ASA TCP Normalizer does not handle OOO TCP ACKs to the box

Last Modified

Nov 27, 2020

Products (1)

  • Cisco Adaptive Security Appliance (ASA) Software

Known Affected Releases

8.4 9.0 9.1

Description (partial)

Bad retransmissions from the ASA (to the box traffic) those retransmissions are triggered by an OOO TCP ACK.

-- 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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