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Category:   Device (Router/Bridge/Hub)  >   Cisco IOS Vendors:   Cisco
Cisco IOS TCP ACK Processing Lets Remote Users Deny Service
SecurityTracker Alert ID:  1028969
SecurityTracker URL:
CVE Reference:   CVE-2013-5469   (Links to External Site)
Date:  Aug 30 2013
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Cisco IOS. A remote user can cause denial of service conditions.

A remote user can exploit a flaw in the TCP stack and send a specially crafted sequence of TCP ACK and FIN packets to the target device to cause an ACK storm, consuming excessive network bandwidth and CPU resources.

The vendor has assigned bug ID CSCtz14399 to this vulnerability.

Impact:   A remote user can consume excessive network bandwidth and CPU resources.
Solution:   The vendor has issued a fix.

The vendor's advisory is available at:

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

Message History:   None.

 Source Message Contents

Date:  Fri, 30 Aug 2013 17:48:34 +0000
Subject:  Cisco IOS


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