CVE-2021-23985 Information disclosure in Firefox
Attackers with local malware can silently enable remote debugging to monitor browsing activity and network traffic.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2021-23985?
CVE-2021-23985 is a medium-severity vulnerability in Mozilla Firefox, published on 31 Mar 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
If an attacker is able to alter specific about:config values (for example malware running on the user's computer), the Devtools remote debugging feature could have been enabled in a way that was unnoticable to the user. This would have allowed a remote attacker (able to make a direct network connection to the victim) to monitor the user's browsing activity and (plaintext) network traffic. This was addressed by providing a visual cue when Devtools has an open network socket. This vulnerability affects Firefox < 87.
Which versions are affected by CVE-2021-23985?
It affects 1 product.
Products include Mozilla Firefox.
How do I fix CVE-2021-23985?
Upgrade to a fixed version.
Is CVE-2021-23985 being exploited?
There is no known exploitation of CVE-2021-23985 in the wild and no public exploit code.
Other vulnerabilities in Mozilla Firefox
Sources
Also known as GHSA-9m9w-3428-h4cq, UBUNTU-CVE-2021-23985.