CVE-2009-2055: Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service Vulnerability
First published: Wed Aug 19 2009(Updated: )
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.
Credit: ykramarz@cisco.com ykramarz@cisco.com psirt@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS XRv 9000 | ||
| Cisco IOS XRv 9000 | =3.4 | |
| Cisco IOS XRv 9000 | =3.4.0 | |
| Cisco IOS XRv 9000 | =3.4.1 | |
| Cisco IOS XRv 9000 | =3.4.2 | |
| Cisco IOS XRv 9000 | =3.4.3 | |
| Cisco IOS XRv 9000 | =3.5 | |
| Cisco IOS XRv 9000 | =3.5.2 | |
| Cisco IOS XRv 9000 | =3.5.3 | |
| Cisco IOS XRv 9000 | =3.5.4 | |
| Cisco IOS XRv 9000 | =3.6.0 | |
| Cisco IOS XRv 9000 | =3.6.1 | |
| Cisco IOS XRv 9000 | =3.6.2 | |
| Cisco IOS XRv 9000 | =3.6.3 | |
| Cisco IOS XRv 9000 | =3.7.0 | |
| Cisco IOS XRv 9000 | =3.7.1 | |
| Cisco IOS XRv 9000 | =3.7.2 | |
| Cisco IOS XRv 9000 | =3.7.3 | |
| Cisco IOS XRv 9000 | =3.8.0 | |
| Cisco IOS XRv 9000 | =3.8.1 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2009-2055?
CVE-2009-2055 is classified as a denial-of-service vulnerability that can significantly disrupt network services.
How does CVE-2009-2055 exploit Cisco IOS XR?
CVE-2009-2055 exploits the processing of BGP UPDATE messages with invalid attributes, causing affected devices to reset sessions.
What versions of Cisco IOS XR are affected by CVE-2009-2055?
CVE-2009-2055 affects Cisco IOS XR versions from 3.4.0 to 3.8.1.
How can I protect my network from CVE-2009-2055?
To protect against CVE-2009-2055, it is recommended to upgrade to a patched version of Cisco IOS XR beyond 3.8.1.
Is there a known workaround for CVE-2009-2055?
While upgrading is the best solution, using access control lists to filter malicious BGP UPDATE messages can serve as a temporary workaround for CVE-2009-2055.
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