CVE-2025-20115

Description

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.

Reserved 2024-10-10 | Published 2025-03-12 | Updated 2025-03-12 | Assigner cisco

Problem types

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Product status

Default status
unknown

6.5.3
affected

6.5.29
affected

6.5.1
affected

6.6.1
affected

6.5.2
affected

6.5.92
affected

6.5.15
affected

6.6.2
affected

7.0.1
affected

6.6.25
affected

6.5.26
affected

6.6.11
affected

6.5.25
affected

6.5.28
affected

6.5.93
affected

6.6.12
affected

6.5.90
affected

7.0.0
affected

7.1.1
affected

7.0.90
affected

6.6.3
affected

6.7.1
affected

7.0.2
affected

7.1.15
affected

7.2.0
affected

7.2.1
affected

7.1.2
affected

6.7.2
affected

7.0.11
affected

7.0.12
affected

7.0.14
affected

7.1.25
affected

6.6.4
affected

7.2.12
affected

7.3.1
affected

7.1.3
affected

6.7.3
affected

7.4.1
affected

7.2.2
affected

6.7.4
affected

6.5.31
affected

7.3.15
affected

7.3.16
affected

6.8.1
affected

7.4.15
affected

6.5.32
affected

7.3.2
affected

7.5.1
affected

7.4.16
affected

7.3.27
affected

7.6.1
affected

7.5.2
affected

7.8.1
affected

7.6.15
affected

7.5.12
affected

7.8.12
affected

7.3.3
affected

7.7.1
affected

6.8.2
affected

7.3.4
affected

7.4.2
affected

6.7.35
affected

6.9.1
affected

7.6.2
affected

7.5.3
affected

7.7.2
affected

6.9.2
affected

7.9.1
affected

7.10.1
affected

7.8.2
affected

7.5.4
affected

6.5.33
affected

7.8.22
affected

7.7.21
affected

7.9.2
affected

7.3.5
affected

7.5.5
affected

7.11.1
affected

7.9.21
affected

7.10.2
affected

24.1.1
affected

7.6.3
affected

7.3.6
affected

7.5.52
affected

7.11.2
affected

24.2.1
affected

24.1.2
affected

24.2.11
affected

24.2.2
affected

7.8.23
affected

7.11.21
affected

24.2.20
affected

6.5.35
affected

References

sec.cloudapps.cisco.com/...y/cisco-sa-iosxr-bgp-dos-O7stePhX (cisco-sa-iosxr-bgp-dos-O7stePhX)

blog.apnic.net/2024/09/02/crafting-endless-as-paths-in-bgp/ (Crafting endless AS-PATHS in BGP)

cve.org (CVE-2025-20115)

nvd.nist.gov (CVE-2025-20115)

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