CVE-2025-20115Cisco IOS XR Software Border Gateway Protocol Denial of Service Vulnerability
- 8.6HighCVSS base score
- 0.90%Exploitation in 30 daysEPSS · top 40% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By cisco
- 5 months later
· 5 months later
Published
- 9 days later
· 9 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| ciscoCNA (assigner) | 3.1 | High8.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H |
| NVDNVD · Analyzed | 3.1 | High8.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.90% · top 40% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.6.
Affected products
- affected 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
- and 53 more
What to do
Exploitation: The Cisco PSIRT is aware of a public announcement about this issue. This announcement is not specific to Cisco IOS XR Software and can be found at . The Cisco PSIRT is not aware of any malicious use of the vulnerability that is described in this advisory.
References
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-7287 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-20115)Record last updated .