CVE-2009-2056: n/a vulnerability

CVE-2009-2056: Cisco IOS XR 3.8.1 and earlier allows remote authenticated users to cause a denial of service (process cras...

Cisco IOS XR 3.8.1 and earlier allows remote authenticated users to cause a denial of service (process crash) via vectors involving a BGP UPDATE message with many AS numbers prepended to the AS path.

UnknownCVSS not scoredNot KEV-listedUpdatedSep 17, 2024, 03:37 UTC (UTC+00:00)

Security readout for executives and security teams

This vulnerability can let an authenticated remote party crash a Cisco IOS XR BGP process by sending a BGP update with an unusually long prepended AS path. For organizations running affected IOS XR versions, the business risk is routing disruption rather than data theft. Exposure is most likely on Cisco IOS XR 3.8.1 and earlier systems running BGP where authenticated remote peers can send UPDATE messages. Prioritize if affected IOS XR routers support critical internal, customer, or internet routing. The main concern is service availability, not confirmed compromise. Absence from KEV lowers urgency, but routing infrastructure outages can have high operational impact. Mitigation focus: Review Cisco's advisory for fixed IOS XR software and official remediation guidance.; Inventory IOS XR devices and prioritize anything at version 3.8.1 or earlier.; Restrict BGP peering to required, trusted, authenticated neighbors only..

Prepared: Jun 28, 2026, 10:26 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Aug 21, 2009, 17:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

1Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

No CWE listed

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