GEN:SID 1:2158
Message MISC BGP invalid length
Summary This event is generated when an invalid BGP session is detected.
Impact Unknown.
Detailed Information This event indicates that an invalid Border Gateway Protocol (BGP) packet has been detected.

BGP packets must have a datasize of at least 20 bytes. This event indicates that a BGP packet was detected with a datasize less than this amount. TCPDump may enter an endless loop trying to process this packet.
Affected Systems This BGP packet may cause problems with TCPDump.
Attack Scenarios An attacker would need to craft a special BGP packet with a type of 0 or a datasize of less than 20 bytes.
Ease of Attack Simple.
Corrective Action Upgrade to the latest non-affected version of the software
Additional References  
Rule References bugtraq: 6213
cve: 2002-1350
url: sf.net/tracker/index.php?func=detail&aid=744523&group_id=53066&atid=469575