CVE-2009-2056

Name: CVE-2009-2056
Creator: NVD / NIST
Published: 2009-08-21T17:30:00.297+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.34%

Last modified Jun 16, 2026

CVE-2009-2056 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 1.34% chance of exploitation in the next 30 days.

Description

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.

Metrics

EPSS Probability

1.34%

67.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-264

Affected Software

Vendor	Product	Versions
Cisco	Ios Xr	<= 3.8.1
Cisco	Ios Xr	3.0
Cisco	Ios Xr	3.0.1
Cisco	Ios Xr	3.1
Cisco	Ios Xr	3.1.0
Cisco	Ios Xr	3.2
Cisco	Ios Xr	3.2.1
Cisco	Ios Xr	3.2.2
Cisco	Ios Xr	3.2.3
Cisco	Ios Xr	3.2.4
Cisco	Ios Xr	3.2.50
Cisco	Ios Xr	3.3
Cisco	Ios Xr	3.4
Cisco	Ios Xr	3.4.0
Cisco	Ios Xr	3.4.1
Cisco	Ios Xr	3.4.2
Cisco	Ios Xr	3.4.3
Cisco	Ios Xr	3.5
Cisco	Ios Xr	3.5.2
Cisco	Ios Xr	3.5.3
Cisco	Ios Xr	3.5.4
Cisco	Ios Xr	3.6
Cisco	Ios Xr	3.6.0
Cisco	Ios Xr	3.6.1
Cisco	Ios Xr	3.6.2
Cisco	Ios Xr	3.6.3
Cisco	Ios Xr	3.7
Cisco	Ios Xr	3.7.0
Cisco	Ios Xr	3.7.1
Cisco	Ios Xr	3.7.2
Cisco	Ios Xr	3.7.3
Cisco	Ios Xr	3.8.0

References

http://securitytracker.com/id?1022756
http://www.cisco.com/en/US/products/products_security_advisory09186a0080af150f.shtmlPatch, Vendor Advisory
http://securitytracker.com/id?1022756
http://www.cisco.com/en/US/products/products_security_advisory09186a0080af150f.shtmlPatch, Vendor Advisory

Timeline

Published: Aug 21, 2009
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2009-2056?

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.

How severe is CVE-2009-2056?

Severity scoring for CVE-2009-2056 is pending analysis. The EPSS model estimates a 1.34% probability of exploitation in the next 30 days.

How do I fix CVE-2009-2056?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2009-2056?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST