Cisco’s BGP Blunder: Patch Now or Risk Router Meltdown!
Cisco has patched a high-severity DoS vulnerability in IOS XR routers that lets attackers crash the Border Gateway Protocol (BGP) process with a single update. Exploiting CVE-2025-20115 requires a BGP confederation setup with 255 AS numbers. Until patched, restrict AS_CONFED_SEQUENCE to 254 numbers or fewer.
Hot Take:
Wow, Cisco’s routers are feeling a bit under the weather, thanks to a nasty case of BGP flu caused by a confederation of autonomous systems. It’s like a game of Jenga with numbers—pull the wrong block, and the whole thing comes crashing down. But fear not, Cisco’s got the remedy (a patch) and some sage advice (limit those AS numbers), so your network can breathe easy again. Stay safe out there, and remember, patching is always in fashion!
Key Points:
- Cisco patched a critical DoS vulnerability (CVE-2025-20115) in IOS XR routers.
- The flaw affects routers with BGP confederation configured, leading to remote device crashes.
- Exploitation involves memory corruption via buffer overflow with 255 AS numbers.
- Solutions include applying the patch or restricting AS_CONFED_SEQUENCE to 254 AS numbers or fewer.
- No in-the-wild exploitation detected, but Cisco advises immediate action.