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You can view, disable, and often remove unwanted or unknown extensions on the Add-ons page. One possible culprit would be an extension. Home Network Security detects if your router's TCP port 7547 is open and accessible from the outside, which could make it vulnerable to future attacks similar to this one.Hi Dan_H, is this a problem on every site, or just one or a few sites in particular? You can check your router's security by running Avast's Home Network Security scan, which is included in Avast Free Antivirus.

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In the end, security software should be implemented directly in the router, which is the central point of the home network, connecting all smart home devices to the internet. We as a digital security company are collaborating with router manufacturers to find solutions that will make routers more secure. The next step for attackers could be to hack into other home devices once they gain access to the router, like webcams, smart TVs, or thermostats. However, it is safe to say that this might be just the beginning of what could happen in the future. Many Deutsche Telekom customers have now experienced what a problem an insecure router can be. For example, the authors of the infamous Mirai botnet, that previously infected IP cameras with default passwords, have started to abuse this vulnerability, and it is possible that they were also the ones behind the attack on Deutsche Telekom customers.'

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Many ISPs neglected to patch their devices in time, leaving a veritable paradise for cybercriminals, as through the vulnerability they can attack hundreds of thousands of devices at the same time.

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'The vulnerability allows remote code execution on many routers and is present, among others, also in Speedport routers issued by Deutsche Telekom. Therefore, Deutsche Telekom routers are affected, while Verizon routers, which require an authentication, are not.

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Through this vulnerability, it is possible for attackers to replace the NTP server name with a series of commands, which are then executed by the router,В for example downloading and executing malware.В Not all routers managed by CWMP are affected though, only the ones that do not require authentication for this request are affected. Normally, the CWMP protocol allows the ISP to send the name of a NTP server where the device can get the current time from, in order to configure its clock. 'Unfortunately, a flaw in processing the NTP time server addresses has recently been disclosed. What's especially nasty about this, is that attackers can close the port after having infected the router with malware, so the ISP can no longer access the port to remove the malware. However, since many ISPs leave this port open to the outside world, it is freely accessible and can be abused by attackers to hack routers whose CWMP service is vulnerable. In fact, with more than 40 million open instances, the TCP portВ 7547В is the second most opened port on the entire public internet, number one being the TCP port 80, used for HTTP. CWMP uses the TCP port 7547, which is widely used around the world. This protocol is used by some Internet Service Providers (ISPs), like Deutsche Telekom, to remotely manage customers' routers, for example to adjust Domain Name Service (DNS) or Network Time Protocol (NTP) settings.

'The problem in this case lies in a vulnerable implementation of the CPE WAN Management Protocol (CWMP, also called TR-069).

So what exactly happened this weekend? My Avast colleague and malware analyst Pavel Е rГЎmek explains: In 2014, when we introduced our Home Network Security feature (included in Avast Free Antivirus), Avast found that three out of four German routers andВ four out of five US routers were vulnerable.Д¬learly the router security situation hasnвЂ™t improved in the last two years, because we're seeing more and more instances where routers are being targeted and used as zombies to carry out DDoS attacks, for example. This shouldnвЂ™t come as a suprise, though, to Germans вЂ“ or anyone else. Why? Because cybercriminals took advantage of a vulnerability in a home router Deutsche Telekom provided its customers.

Over the weekend, hundreds of thousands of Deutsche Telekom customers in Germany were unable to connect to their home internet.

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Thousands of Telekom customers in Germany have been knocked offline due to a cyber attack targeting routers.

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