CVE-2021-36773 Denial of service in n/a
Crafted websites can cause unbounded recursion in uBlock Origin and nMatrix extensions, leading to memory exhaustion and loss of blocking functionality.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-36773?
CVE-2021-36773 is a high-severity denial of service vulnerability in Debian Debian Linux, published on 18 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
uBlock Origin before 1.36.2 and nMatrix before 4.4.9 support an arbitrary depth of parameter nesting for strict blocking, which allows crafted web sites to cause a denial of service (unbounded recursion that can trigger memory consumption and a loss of all blocking functionality).
Weakness: CWE-674
Which versions are affected by CVE-2021-36773?
It affects 4 products.
Products include Debian Debian Linux, Sciruby Nmatrix, Ublockorigin Ublock Origin, Umatrix Project Umatrix.
How do I fix CVE-2021-36773?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-36773 being exploited?
There is no known exploitation of CVE-2021-36773 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as DEBIAN-CVE-2021-36773, GHSA-vgm6-c9jx-rm2c, UBUNTU-CVE-2021-36773.