CVE-2009-2055

Exploitation

Exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalog on 2022-03-25. Federal remediation due 2022-04-15.

SSVC decision

• ExploitationactiveCISA reports credible evidence of active exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

3.33% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 87.5% of scored records. A rank, not a probability.

NVD base score

5.9 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD analysis status

Analyzed. NVD last modified this record on 2026-06-16.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2009-08-19 17:00Z17 YR AGO

Last updated

2026-01-12 20:39Z7 MO AGO

Reserved

2009-06-12

Assigning CNA

cisco

Record state

PUBLISHED

Severity

Medium (CVSS 5.9)

CNA CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Weaknesses

• CWE-20Improper Input ValidationClass

Data version

5.2

Document digest

e0b878e1f18a43b3833fd600f873f8f499ba021453ac867bad488a409acaaa46

• mailman.nanog.org[nanog] 20090817 RE: Anyone else seeing "(invalid or corrupt AS path) 3 bytes E01100" ?http://mailman.nanog.org/pipermail/nanog/2009-August/012719.htmlmailing-listx_refsource_MLIST
• securitytracker.com1022739http://securitytracker.com/id?1022739vdb-entryx_refsource_SECTRACK
• www.cisco.com20090818 Cisco IOS XR Software Border Gateway Protocol Vulnerabilityhttp://www.cisco.com/en/US/products/products_security_advisory09186a0080af150f.shtmlvendor-advisoryx_refsource_CISCO
• www.cisa.govhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2009-2055government-resource