1. Symantec/
  2. Security Response/
  3. Microsoft ASP.NET Core CVE-2017-11770 Denial of Service Vulnerability

Microsoft ASP.NET Core CVE-2017-11770 Denial of Service Vulnerability



Date Discovered

November 14, 2017


Microsoft ASP.NET Core is prone to a remote denial of service vulnerability. An attacker can exploit this issue to cause a denial of service condition. ASP.NET Core 1.0, 1.1 and 2.0 are vulnerable.

Technologies Affected

  • Microsoft ASP.NET Core 1.0
  • Microsoft ASP.NET Core 1.1
  • Microsoft ASP.NET Core 2.0


Block external access at the network boundary, unless external parties require service.

If global access isn't needed, filter access to the affected computer at the network boundary. Restricting access to only trusted computers and networks might greatly reduce the likelihood of exploits.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.

Deploy NIDS to monitor network traffic for signs of anomalous or suspicious activity. This includes unexplained incoming and outgoing traffic. This may indicate exploit attempts or activity that results from successful exploits.
Updates are available. Please see the references or vendor advisory for more information.


Bachraty Gergely
Copyright © Symantec Corporation.
Permission to redistribute this alert electronically is granted as long as it is not edited in any way unless authorized by Symantec Security Response. Reprinting the whole or part of this alert in any medium other than electronically requires permission from secure@symantec.com.

The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.
Symantec, Symantec products, Symantec Security Response, and secure@symantec.com are registered trademarks of Symantec Corp. and/or affiliated companies in the United States and other countries. All other registered and unregistered trademarks represented in this document are the sole property of their respective companies/owners.

Threat Intelligence

Follow the Threat Intelligence Twitter feed
STAR Antimalware Protection Technologies
2016 Internet Security Threat Report, Volume 21
  • Twitter
  • Facebook
  • LinkedIn
  • Google+
  • YouTube