CVE-2021-23982 Server-side request forgery in Firefox
A malicious webpage could scan internal network hosts and local services via WebRTC, exposing internal network topology to attackers.
- 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-2021-23982?
CVE-2021-23982 is a medium-severity server-side request forgery 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
Using techniques that built on the slipstream research, a malicious webpage could have scanned both an internal network's hosts as well as services running on the user's local machine utilizing WebRTC connections. This vulnerability affects Firefox ESR < 78.9, Firefox < 87, and Thunderbird < 78.9.
Weakness: CWE-326
Which versions are affected by CVE-2021-23982?
It affects 3 products.
Products include Mozilla Firefox, Mozilla Firefox Esr, Mozilla Thunderbird.
How do I fix CVE-2021-23982?
Upgrade to a fixed version.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2021-23982 being exploited?
There is no known exploitation of CVE-2021-23982 in the wild and no public exploit code.
Other vulnerabilities in Mozilla Firefox
Sources
Also known as DEBIAN-CVE-2021-23982, GHSA-hg4f-qgj6-3h4w, UBUNTU-CVE-2021-23982.