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Cisco Bug: CSCvg39082 - Cisco IOS and IOS XE Software TCP Denial of Service Vulnerability

Last Modified

Mar 13, 2020

Products (150)

  • Cisco IOS
  • Cisco Catalyst 2960X-24PD-L Switch
  • Cisco Catalyst 3560X-48T-E Switch
  • Cisco IE 2000-4T-G Industrial Ethernet Switch
  • Cisco IE 2000-16TC-G Industrial Ethernet Switch
  • Cisco Catalyst 3560X-48U-S Switch
  • Cisco Catalyst 2960X-24PS-L Switch
  • Cisco Catalyst 2960X-48LPS-L Switch
  • Cisco Catalyst 2960S-24PD-L Switch
  • Cisco Catalyst 2960C-12PC-L Switch
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Known Affected Releases

15.2(2)E4

Description (partial)

<B>Symptom:</B>
A vulnerability in the TCP socket code of Cisco IOS and IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to a state condition between the socket state and the transmission control block (TCB) state. While this vulnerability potentially affects all TCP applications, the only affected application observed so far is the HTTP server.

An attacker could exploit this vulnerability by sending specific HTTP requests at a sustained rate to a reachable IP address of the affected software. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a denial of service (DoS) condition on an affected device.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190109-tcp

<B>Conditions:</B>
Please refer to the Security Advisory.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
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  • Known Fixed Releases
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