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Cisco Security Notice

Cisco IOS Software TCP ACK Storm Vulnerability

http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2013-5469
CVE ID: CVE-2013-5469
Release Date: 2013 August 30 15:09  UTC (GMT)
Last Updated: 2013 September 3 17:25  UTC (GMT)

Related Resources:

View related Alert

Summary

A vulnerability in the TCP stack of Cisco IOS Software could allow an unauthenticated, remote attacker to cause an ACK storm.

The vulnerability is due to improper closing of an established TCP connection. An attacker could exploit this vulnerability by sending a crafted sequence of TCP ACK and FIN packets to an affected device. A successful exploit could allow the attacker to cause an ACK storm resulting in excessive network and CPU utilization.

Affected Products

ProductMore InformationCVSS
IOSCSCtz143994.3/3.6

What Is a Cisco Security Notice?

The Cisco Product Security Incident Response Team (PSIRT) publishes Cisco Security Notices to inform customers of low- to mid-level severity security issues involving Cisco products.

Customers who wish to upgrade to a software version that includes fixes for these issues should contact their normal support channels. Free software updates will not be provided for issues that are disclosed through a Cisco Security Notice.

For additional information about Cisco PSIRT publications, see the Cisco Security Vulnerability Policy at http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html

Customers Using Third-Party Support Organizations

Customers may have Cisco products that are provided or maintained through prior or existing agreements with third-party support organizations, such as Cisco Partners, authorized resellers, or service providers. For these products, customers should consult their service providers or support organizations to ensure that any applied workaround or fix is the most appropriate in the intended network before it is deployed.

Disclaimer

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A stand-alone copy or paraphrase of the text of this document that omits the distribution URL is an uncontrolled copy, and may lack important information or contain factual errors.

 
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