CVE-2025-4215 gorhill uBlock Origin UI 1p-filters.js currentStateChanged redos
Remote attackers can cause denial of service in uBlock Origin via inefficient regular expressions in the UI component.
- 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-2025-4215?
CVE-2025-4215 is a low-severity denial of service vulnerability in Debian Debian Linux, published on 2 May 2025. 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
A vulnerability was found in gorhill uBlock Origin up to 1.63.3b16. It has been classified as problematic. Affected is the function currentStateChanged of the file src/js/1p-filters.js of the component UI. The manipulation leads to inefficient regular expression complexity. It is possible to launch the attack remotely. The complexity of an attack is rather high. The exploitability is told to be difficult. The exploit has been disclosed to the public and may be used. Upgrading to version 1.63.3b17 is able to address this issue. The patch is identified as eaedaf5b10d2f7857c6b77fbf7d4a80681d4d46c. It is recommended to upgrade the affected component.
Which versions are affected by CVE-2025-4215?
It affects 2 products.
Products include Debian Debian Linux, Ublockorigin Ublock Origin.
How do I fix CVE-2025-4215?
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-2025-4215 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-4215 exists.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as DEBIAN-CVE-2025-4215, DLA-4215-1, GHSA-785g-r934-c877, UBUNTU-CVE-2025-4215.