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Category:   Device (Firewall)  >   Cisco PIX Firewall Vendors:   Cisco
Cisco PIX Firewall DHCP Relay Agent Lets Remote Users Deny Service
SecurityTracker Alert ID:  1018000
SecurityTracker URL:
CVE Reference:   CVE-2007-2461   (Links to External Site)
Updated:  May 12 2008
Original Entry Date:  May 2 2007
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 7.2(1) through 7.2(2.14)
Description:   A vulnerability was reported in Cisco PIX Firewall. A remote user can cause denial of service conditions.

When the DHCP relay agent function is enabled, a remote user can send a large number of DHCP packets to consume excessive memory resources on the target device. This will cause the target device to stop forwarding packets.

Systems configured with more than one DHCP server via the dhcprelay server command are vulnerable.

Systems configured with only a single DHCP server via the dhcprelay server command are not affected.

The Firewall Services Module (FWSM) is not affected.

Cisco has assigned Cisco Bug ID CSCsh50277 to this vulnerability.

Lisa Sittler and Grant Deffenbaugh of CERT/CC discovered this vulnerability.

Impact:   A remote user can cause the target device to stop forwarding packets.
Solution:   The vendor has issued a fixed version (7.2(2.15)), available at:

The Cisco advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Resource error
Underlying OS:  

Message History:   None.

 Source Message Contents

Date:  Wed, 2 May 2007 17:13:59 -0400
Subject:  Cisco PIX Firewall and Cisco ASA


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