Weekend web surfing may be sporadically affected as ISP’s and hosting companies scramble to patch ALL Cisco routers on the Internet.
Most providers were doing upgrades overnight this weekend to address a major Cisco IOS vulnerability that now has an exploit available. The vulnerability allowed an attacker to shut down the router interface cold, thereby stopping all traffic on the router. This was a mile wide hole in the Internet that has every Internet company scrambling to patch.
You should have received a notice from your web host about their plans to address this issue, if not contact them immediately to find out when their network will be protected.
Details on the vulnerability and exploit are available at this CERT Advisory
Hat tip: Social Reject (for reminding me that I forgot to publicize this on Friday)