February 13, 2014
On Monday we mitigated a large DDoS that targeted one of our customers. The attack peaked just shy of 400Gbps. We've seen a handful of other attacks at this scale, but this is the largest attack we've seen that uses NTP amplification....
January 09, 2014
Over the last couple of weeks you may have been hearing about a new tool in the DDoS arsenal: NTP-based attacks. These have become popular recently and caused trouble for some gaming web sites and service providers....
October 03, 2013
A critical zero-day vulnerability was published today affecting any hosting provider using WHMCS. As part of building a safer web, CloudFlare has added a ruleset to our Web Application Firewall (WAF) ...
July 30, 2013
One of the many great features that CloudFlare provides is protection from Distributed Denial of Service (DDoS) attacks. A malicious party who wants to make your website or web service unavailable could try to overwhelm it with requests from compromised machines (or bots) all around the world. ...
March 27, 2013
The New York Times this morning published a story about the Spamhaus DDoS attack and how CloudFlare helped mitigate it and keep the site online. The Times calls the attack the largest known DDoS attack ever on the Internet....
March 03, 2013
This morning at 09:47 UTC CloudFlare effectively dropped off the Internet. The outage affected all of CloudFlare's services including DNS and any services that rely on our web proxy....
February 22, 2013
This has been a rough week in the security industry with big attacks and compromises reported at companies from Facebook to Apple. ...
December 21, 2012
Looking at the latest DDoS attack statistics from CloudFlare's network, it seems that hackers love the holidays....
October 30, 2012
A few weeks ago I wrote about DNS Amplification Attacks. These attacks are some of the largest, as measured by the number of Gigabits per second (Gbps), that we see directed toward our network....
September 17, 2012
Yesterday I posted a post mortem on an outage we had Saturday. The outage was caused when we applied an overly aggressive rate limit to traffic on our network while battling a determined DDoS attacker. ...
August 28, 2012
CloudFlare's I'm Under Attack mode allows our customers to, at the click of a button, tell us that they are experiencing an attack and enable automatic protection. It works by slowing down visits to the web site that's under attack and performing extra work to identify malicious ...
August 16, 2012
Recently, I've taken a look at DDoS attacks against CloudFlare sites at the IP level and the source of those attacks. The worst time for those DDoS attacks is the Wednesday Witching Hour and because of source IP address forgery most of the attacks seem to come from Mars. ...
August 06, 2012
Following on from my recent post about when attacks hit CloudFlare, here's a follow up looking at where they come from. Or at least where they say they come from. Looking at attack statistics for the month of July 2012 the largest source of attacks is Mars....
August 03, 2012
Data from inside CloudFlare's network shows that over 40% of the time there's a denial of service attack happening and directed at us. And that's just up to network layer 4 (i.e. it doesn't include more sophisticated attacks targeting applications themselves at layer 7)....
December 21, 2011
As the year comes to a close, we've been assembling trend data for 2011. One of the most interesting has been the rise of denial of service (DDoS) attacks. Controlling for CloudFlare's growth, we've seen a 700% increase in DDoS attacks over the course of the year....
November 16, 2011
The United States House of Representatives is considering the Stop Online Piracy Act, known as SOPA. Companies including Google, Zynga, Facebook, Yahoo, AOL, and Mozilla, along with organizations like the Electronic Frontier Foundation (EFF) have been sharply critical of the law....
May 18, 2011
We always talk about how CloudFlare gets smarter, and we do that in a variety of ways. One of the ways is that we look at changes in traffic to a site. If there is a big change, then our system automatically starts to investigate whether it is legitimate traffic or an attack. ...
