Read Cisco SD-WAN Software Packet Filtering Bypass Vulnerability.
According to this Security Bulletin:
At the time of publication, this vulnerability affected Cisco IOS XE Software releases 17.2.1 and earlier and Cisco IOS XE SD-WAN Software releases 16.12.2r and earlier.
It affects routers running IOS-XE versions 17.2.1 and earlier as well as routers running SD-WAN firmware IOS-XE 17.12.2r and earlier.
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