Preview Tool

Cisco Bug: CSCvi66266 - DNS request matching split-DNS domain leaked by Hyper-V host when DNS query issued by Hyper-V guest

Last Modified

Jul 17, 2018

Products (1)

  • Cisco AnyConnect Secure Mobility Client

Known Affected Releases


Description (partial)

DNS request targeting third-level domain (e.g. matching split-DNS domain (e.g. second-level  domain configured on the VPN server is answered via the physical adapter with a response containing an SOA record, clearly indicating that the DNS request was allowed outside the VPN tunnel despite matching a split-DNS domain.

- Platform: Windows 10.
- Split-DNS enabled on the VPN server.
- AnyConnect client host with Hyper-V enabled, DNS request matching split-DNS domain issued from Hyper-V guest also running Windows 10.
Bug details contain sensitive information and therefore require a account to be viewed.

Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
Bug information is viewable for customers and partners who have a service contract. Registered users can view up to 200 bugs per month without a service contract.