Apparently all of the big name routing gear’s been hit with this flaw. It’s apparently an issue that they’d all been working to fix, & there are updates available.
"The National Infrastructure Security Co-ordination Centre, part of the
U.K. Home Office, has published details of a denial-of-service
vulnerability that can affect routers’ ability to handle traffic using
TCP, or Transmission Connection Protocol, a widely used protocol for
sending data over the Internet."