Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service Vulnerability
- Severity
- Medium5.9CVSS 3.1, Medium
- Known exploited
- Known exploitedFederal remediation due date: 15 Apr 2022
- Exploit prediction
- 3%
- Published
- 19 Aug 2009Updated 16 Jun 2026 · Last verified 29 Sept 2026
Description
Title, description and vendor guidance are quoted from the source records.
Cisco IOS XR 3.4.0 through 3.8.1 allows remote attackers to cause a denial of service (session reset) via a BGP UPDATE message with an invalid attribute, as demonstrated in the wild on 17 August 2009.
Weakness: CWE-20
Known exploited
Added to CISA KEV on 25 Mar 2022
Federal remediation due date: 15 Apr 2022
Required action: Apply updates per vendor instructions.
Exploit prediction
3% probability of exploitation in the next 30 days (percentile 88%).
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
Patcharo shows this vulnerability for information but does not match versions for this product yet.
- n/a n/a · n/a
References
Provenance
Every fact on this page comes from the sources below. Nothing is written by an AI.
- Cisco (CVE record)
- Cisco (CVE record) · 29 Sept 2026 at 21:17 UTC · Parser patcharo-cve5/1.1.0
- CISA Known Exploited Vulnerabilities
- CISA Known Exploited Vulnerabilities · 29 Sept 2026 at 21:17 UTC · Parser patcharo-kev/1.0.0
- NVD
- NVD · 27 Sept 2026 at 23:44 UTC · Parser patcharo-nvd/1.0.0
- FIRST EPSS
- FIRST EPSS · 30 Sept 2026 at 00:17 UTC · Parser patcharo-epss/1.0.0
Last verified: 29 Sept 2026 at 21:17 UTC