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- cisco-sa-iosxr-bgp-dos-O7stePhX
cisco-sa-iosxr-bgp-dos-O7stePhX: Cisco IOS XR Software Border Gateway Protocol Confederation Denial of Service Vulnerability
First published: Wed Mar 12 2025(Updated: )
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 has released software updates that address this vulnerability. There is a workaround that addresses this vulnerability.This advisory is available at the following link:https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-bgp-dos-O7stePhXThis advisory is part of the March 2025 release of the Cisco IOS XR Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: March 2025 Semiannual Cisco IOS XR Software Security Advisory Bundled Publication.
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS XRv 9000 |
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Reference Links
Frequently Asked Questions
What is the severity of cisco-sa-iosxr-bgp-dos-O7stePhX?
The severity of cisco-sa-iosxr-bgp-dos-O7stePhX is critical due to its potential to cause a denial of service condition.
What causes the cisco-sa-iosxr-bgp-dos-O7stePhX vulnerability?
The cisco-sa-iosxr-bgp-dos-O7stePhX vulnerability is caused by a memory corruption in the BGP confederation implementation in Cisco IOS XR Software.
Who is affected by cisco-sa-iosxr-bgp-dos-O7stePhX?
The cisco-sa-iosxr-bgp-dos-O7stePhX vulnerability affects devices running Cisco IOS XR Software.
How do I fix cisco-sa-iosxr-bgp-dos-O7stePhX?
To fix cisco-sa-iosxr-bgp-dos-O7stePhX, upgrade to the latest version of Cisco IOS XR Software that addresses this vulnerability.
Can cisco-sa-iosxr-bgp-dos-O7stePhX be exploited remotely?
Yes, cisco-sa-iosxr-bgp-dos-O7stePhX can be exploited by unauthenticated remote attackers.
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