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PatchSiren cyber security CVE debrief

CVE-2009-2055 Cisco CVE debrief

CVE-2009-2055 is a Cisco IOS XR Border Gateway Protocol (BGP) denial-of-service vulnerability that CISA lists in its Known Exploited Vulnerabilities catalog. For defenders, the key takeaway is that this issue is treated as actively exploited and should be prioritized for remediation using Cisco’s vendor guidance.

Vendor
Cisco
Product
IOS XR
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2022-03-25
Original CVE updated
2022-03-25
Advisory published
2022-03-25
Advisory updated
2022-03-25

Who should care

Network and security teams running Cisco IOS XR, especially environments that rely on BGP for routing and internet connectivity. Operators of edge routers and teams responsible for patching network infrastructure should treat this as a priority item.

Technical summary

The supplied official records identify this issue as a denial-of-service vulnerability in Cisco IOS XR’s BGP handling. CISA’s KEV entry marks it as known exploited and directs organizations to apply updates per vendor instructions. No additional technical details or CVSS score were provided in the supplied corpus.

Defensive priority

High. CISA included the issue in the Known Exploited Vulnerabilities catalog and set a remediation due date of 2022-04-15, indicating it should be addressed promptly on exposed Cisco IOS XR systems.

Recommended defensive actions

  • Apply Cisco IOS XR updates per vendor instructions as soon as possible.
  • Review Cisco IOS XR devices that participate in BGP and prioritize externally reachable routing infrastructure.
  • Confirm whether any affected systems are present in production, lab, or customer-facing network segments.
  • Track remediation against the CISA KEV due date and verify patch completion.
  • Monitor Cisco and CISA advisories for any updated guidance related to CVE-2009-2055.

Evidence notes

This debrief is based only on the supplied official sources: the CISA KEV record/feed entry, the CVE.org record link, and the NVD detail link reference. The source corpus confirms the product (Cisco IOS XR), vulnerability class (BGP denial of service), KEV status, and required action. No CVSS score was supplied, and no unsupported version-specific or exploit-specific details are included.

Official resources

Public debrief based on official vulnerability records and CISA KEV data. CVSS was not provided in the supplied corpus, and this summary avoids unsupported technical specifics.