CVE-2025-20115

A vulnerability in confederation implementation for the Border Gateway Protocol (BGP) in Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. This vulnerability is due to a memory corruption that occurs when a BGP update is created with an AS_CONFED_SEQUENCE attribute that has 255 autonomous system numbers (AS numbers). An attacker could exploit this vulnerability by sending a crafted BGP update message, or the network could be designed in such a manner that the AS_CONFED_SEQUENCE attribute grows to 255 AS numbers or more. A successful exploit could allow the attacker to cause memory corruption, which may cause the BGP process to restart, resulting in a DoS condition. To exploit this vulnerability, an attacker must control a BGP confederation speaker within the same autonomous system as the victim, or the network must be designed in such a manner that the AS_CONFED_SEQUENCE attribute grows to 255 AS numbers or more.

• cisco ios xr 6.5.1 • cisco ios xr 6.5.2 • cisco ios xr 6.5.3 • cisco ios xr 6.5.15 • cisco ios xr 6.5.25 • cisco ios xr 6.5.26 • cisco ios xr 6.5.28 • cisco ios xr 6.5.29 • cisco ios xr 6.5.31 • cisco ios xr 6.5.32 • cisco ios xr 6.5.33 • cisco ios xr 6.5.35 • cisco ios xr 6.5.90 • cisco ios xr 6.5.92 • cisco ios xr 6.5.93 • cisco ios xr 6.6.1 • cisco ios xr 6.6.2 • cisco ios xr 6.6.3 • cisco ios xr 6.6.4 • cisco ios xr 6.6.11 • cisco ios xr 6.6.12 • cisco ios xr 6.6.25 • cisco ios xr 6.7.1 • cisco ios xr 6.7.2 • cisco ios xr 6.7.3 • cisco ios xr 6.7.4 • cisco ios xr 6.7.35 • cisco ios xr 6.8.1 • cisco ios xr 6.8.2 • cisco ios xr 6.9.1 • cisco ios xr 6.9.2 • cisco ios xr 7.0.0 • cisco ios xr 7.0.1 • cisco ios xr 7.0.2 • cisco ios xr 7.0.11 • cisco ios xr 7.0.12 • cisco ios xr 7.0.14 • cisco ios xr 7.0.90 • cisco ios xr 7.1.1 • cisco ios xr 7.1.2 • cisco ios xr 7.1.3 • cisco ios xr 7.1.15 • cisco ios xr 7.1.25 • cisco ios xr 7.2.0 • cisco ios xr 7.2.1 • cisco ios xr 7.2.2 • cisco ios xr 7.2.12 • cisco ios xr 7.3.1 • cisco ios xr 7.3.2 • cisco ios xr 7.3.3 • cisco ios xr 7.3.4 • cisco ios xr 7.3.5 • cisco ios xr 7.3.6 • cisco ios xr 7.3.15 • cisco ios xr 7.3.16 • cisco ios xr 7.3.27 • cisco ios xr 7.4.1 • cisco ios xr 7.4.2 • cisco ios xr 7.4.15 • cisco ios xr 7.4.16 … and 33 more