A vulnerability, found in EdgeRouters Version 2.0.9-hotfix.5 and earlier and UniFi Security Gateways (USG) Version 4.4.56 and earlier with their DHCPv6 prefix delegation set to dhcpv6-stateless or dhcpv6-stateful, allows a malicious actor directly connected to the WAN interface of an affected device to create a remote code execution vulnerability.

The TCP implementation in (1) Linux, (2) platforms based on BSD Unix, (3) Microsoft Windows, (4) Cisco products, and probably other operating systems allows remote attackers to cause a denial of service (connection queue exhaustion) via multiple vectors that manipulate information in the TCP state table, as demonstrated by sockstress.