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Fiber hub and Avast

First Timer
Message 2 of 2

I recently upgraded to fibre, and it was only a 5 minute job, no problems and it seems to work well.

Avast popped up and asked to scan the new router and came up with this warning.


our router or Wi-Fi hotspot is vulnerable to network attacks!
We have found vulnerabilities in your router or Wi-Fi hotspot that can be used by attackers to hack into your network.
Our scan found a vulnerability on your router or Wi-Fi hotspot device. Your device contains a problem that can be misused by cybercriminals to break into your network and compromise your security and privacy.

Android devices used as a Wi-Fi hotspot can be also affected.

Some of the vulnerabilities may be patched in new versions of the device firmware or system update. Applying the latest firmware or system update may solve the issue.

Consult your device's manual for instructions. If an update adressing the vulnerability issue is not available, contact your devices's vendor or manufacturer to provide an update as soon as possible.

As routers typically do not perform automatic updates, you need to manually download and install the appropriate patches on the device.
Done incorrectly, applying the latest firmware can make your router unusable. We recommend this method for advanced users or computer technicians only.

We have identified the following problem with your router or Wi-Fi hotspot device:

DnsMasq heap buffer overflow vulnerability
Severity: High

Reference: CVE-2017-14491 | Google Security Blog

The affected device's DNS service is running an outdated version of the DnsMasq software which is known to have a heap buffer overflow vulnerability. A remote attacker can gain control of your network device and your Internet connection by sending malformed DNS packets to the device. It allows the attacker to intercept connections and perform a traffic hijack, or execute arbitrary code with unrestricted privileges as well as access all important and private data stored on the device -- your device login/password combination, your Wi-Fi password, and your configuration data.

Any device connected to your network, including computers, phones, tablets, printers, security cameras, or any other networked device in your home or office network, may have an increased risk of compromise.

The issue was fixed in DnsMasq software version 2.78, released in October 2017.

To solve the vulnerability on your device, apply the firmware or system update that contains DnsMasq software version 2.78 or higher provided by your device's manufacturer.

If an update addressing the vulnerability is not yet available for your device, you can secure your router or Wi-Fi hotspot with a strong password to minimize risks imposed by the vulnerability. We also advise you not to visit suspicious websites or run software from questionable sources.


I have contacted TT, they did not explain what exactly the problem or a solution might be.

Has this happened to anyone else?

Is the problem contained in all the fiber routers?

I have taken the advice from avast and use a pass phrase rather than a password.


Community Star
Message 1 of 2

Do not worry about this because the router has counter measures in place to negate these vulnerabilities. The version of dnsmasq used will be updated soon (hopefully in the next version of firmware, but I can't be certain about that).

I am not employed by TalkTalk, I'm just a customer. If my post has fixed the issue, please set Accept as Solution from the 3 dot menu.
TalkTalk support and Community Stars - Who are they?