How severe is CVE-2025-4215?

CVE-2025-4215 has a CVSS 3.x base score of 3.1, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2025-4215 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-4215?

CVE-2025-4215 primarily affects Ublockorigin Ublock Origin. In total, 18 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-4215?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-4215 have an EU (EUVD) identifier?

Yes. CVE-2025-4215 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-13306.

When was CVE-2025-4215 published?

CVE-2025-4215 was published on 2025-05-02 and last updated on 2026-06-17.

CVE-2025-4215

CVE-2025-4215 is a low-severity vulnerability in Ublockorigin Ublock Origin with a CVSS 3.x base score of 3.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1333.

Key facts

Severity: Low (CVSS 3.x base score 3.1)
CVSS v2: 2.6
CVSS v4: 2.3
EPSS exploit prediction: 1% (43rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-13306
Weakness: CWE-1333
Affected product: Ublockorigin Ublock Origin
Published: 2025-05-02
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-4215?: 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.
How severe is CVE-2025-4215?: CVE-2025-4215 has a CVSS 3.x base score of 3.1, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2025-4215 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-4215?: CVE-2025-4215 primarily affects Ublockorigin Ublock Origin. In total, 18 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-4215?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-4215 have an EU (EUVD) identifier?: Yes. CVE-2025-4215 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-13306.
When was CVE-2025-4215 published?: CVE-2025-4215 was published on 2025-05-02 and last updated on 2026-06-17.

References

Affected products (18)

cpe:2.3:a:ublockorigin:ublock_origin:*:*:*:*:*:*:*:*
cpe:2.3:a:ublockorigin:ublock_origin:1.63.3:beta1:*:*:*:*:*:*
cpe:2.3:a:ublockorigin:ublock_origin:1.63.3:beta10:*:*:*:*:*:*
cpe:2.3:a:ublockorigin:ublock_origin:1.63.3:beta11:*:*:*:*:*:*
cpe:2.3:a:ublockorigin:ublock_origin:1.63.3:beta12:*:*:*:*:*:*
cpe:2.3:a:ublockorigin:ublock_origin:1.63.3:beta13:*:*:*:*:*:*
cpe:2.3:a:ublockorigin:ublock_origin:1.63.3:beta14:*:*:*:*:*:*
cpe:2.3:a:ublockorigin:ublock_origin:1.63.3:beta15:*:*:*:*:*:*
cpe:2.3:a:ublockorigin:ublock_origin:1.63.3:beta16:*:*:*:*:*:*
cpe:2.3:a:ublockorigin:ublock_origin:1.63.3:beta2:*:*:*:*:*:*
cpe:2.3:a:ublockorigin:ublock_origin:1.63.3:beta3:*:*:*:*:*:*
cpe:2.3:a:ublockorigin:ublock_origin:1.63.3:beta4:*:*:*:*:*:*
cpe:2.3:a:ublockorigin:ublock_origin:1.63.3:beta5:*:*:*:*:*:*
cpe:2.3:a:ublockorigin:ublock_origin:1.63.3:beta6:*:*:*:*:*:*
cpe:2.3:a:ublockorigin:ublock_origin:1.63.3:beta7:*:*:*:*:*:*
cpe:2.3:a:ublockorigin:ublock_origin:1.63.3:beta8:*:*:*:*:*:*
cpe:2.3:a:ublockorigin:ublock_origin:1.63.3:beta9:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*

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