Vulnerability Note VU#106392
Cisco IOS vulnerable to DoS via unrecognized transitive attribute in BGP UPDATE
There is a denial-of-service vulnerability in several specific but common configurations of Cisco IOS.
Attackers that are able to send malformed BGP updates can cause vulnerable routers to crash causing network outages. Under certain circumstances, an attacker may be able to use the BGP infrastructure to propogate the bad route update to multiple routers.
Cisco has released an advisory that provides a list of affected products, along with instructions for obtaining fixed software. Because there are many possible combinations of hardware and software configurations, the CERT/CC recommends that all users of IOS and software consult the following Cisco Security Advisory:
If you are a vendor and your product is affected, let
|Vendor||Status||Date Notified||Date Updated|
|Cisco Systems Inc.||Affected||-||10 May 2001|
The CERT/CC would like to thank Cisco Systems for providing a description of this vulnerability and a patch to address it.
This document was written by Ian A. Finlay and is based on information obtained from a Cisco Security Advisory.
10 May 2001
Date First Published:
10 May 2001
Date Last Updated:
09 Apr 2003
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