PT-2025-11095 · Cisco · Cisco Ios Xr
Published
2025-03-12
·
Updated
2025-03-26
·
CVE-2025-20115
CVSS v3.1
8.6
High
| Vector | AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions:
Cisco IOS XR Software (affected versions not specified)
Description:
A vulnerability in the 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.
Recommendations:
As a temporary workaround, consider restricting the
AS CONFED SEQUENCE attribute to 254 or fewer AS numbers until patches can be applied.
Apply the latest patches provided by Cisco to fix the vulnerability.
Consider enforcing security measures to limit the BGP AS CONFED SEQUENCE attribute and maintain system integrity.
Keep network devices updated to prevent similar vulnerabilities.Fix
DoS
Buffer Overflow
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Weakness Enumeration
Related Identifiers
Affected Products
Cisco Ios Xr