Denial of service in Cisco IOS XR

1) Buffer overflow

EUVDB-ID: #VU105698

Risk: High

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2025-20115

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error in confederation implementation for the Border Gateway Protocol (BGP). A remote attacker can send a specially crafted BGP update message, trigger memory corruption and cause a denial of service condition on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco IOS XR: - - 24.3

CPE2.3

• cpe:2.3:o:cisco_systems:cisco_ios_xr:7.11:*:*:*:*:*:*:*
• cpe:2.3:o:cisco_systems:cisco_ios_xr:24.1:*:*:*:*:*:*:*
• cpe:2.3:o:cisco_systems:cisco_ios_xr:24.2:*:*:*:*:*:*:*
• cpe:2.3:o:cisco_systems:cisco_ios_xr:24.3:*:*:*:*:*:*:*

External links

http://blog.apnic.net/2024/09/02/crafting-endless-as-paths-in-bgp/
http://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-bgp-dos-O7stePhX

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.