CVE-2025-4215 | gorhill uBlock Origin UI 1p-filters.js currentStateChanged redos

Exp

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.

Published: 2025-05-02 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-4215 is rated Exploit Available (50/100): CVSS Low severity, with low exploitation likelihood (EPSS 0.55%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2025-4215

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2025-4215

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.12% 0.55% +0.43%
2 2026-06-10 1.34% 0.12% -1.22%
3 2026-02-26 — 1.34% —

Full EPSS history (15 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-4215

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
2.3 4.0 LOW
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network.
Attack complexity (AC:H)
Exploitation depends on constrained or hard-to-reproduce conditions.
Attack requirements (AT:N)
No additional preconditions are required beyond normal reachability.
Privileges required (PR:N)
No privileges are required.
User interaction (UI:P)
A user has to participate (for example click/open/approve).
Vulnerable system confidentiality impact (VC:N)
No confidentiality impact on the vulnerable system.
Vulnerable system integrity impact (VI:N)
No integrity impact on the vulnerable system.
Vulnerable system availability impact (VA:L)
Limited availability impact on the vulnerable system.
Subsequent system confidentiality impact (SC:N)
No confidentiality impact on subsequent systems.
Subsequent system integrity impact (SI:N)
No integrity impact on subsequent systems.
Subsequent system availability impact (SA:N)
No availability impact on subsequent systems.
Exploit maturity (threat) (E:X)
Not defined: no reliable threat intelligence; scoring assumes the worst case (equivalent to Attacked).
Confidentiality requirement (CR:X)
Not defined: insufficient information; scoring treats this like High (worst case).
Integrity requirement (IR:X)
Not defined: insufficient information; scoring treats this like High (worst case).
Availability requirement (AR:X)
Not defined: insufficient information; scoring treats this like High (worst case).
Modified attack vector (MAV:X)
Not defined: scoring uses the Base Attack Vector (AV).
Modified attack complexity (MAC:X)
Not defined: scoring uses the Base Attack Complexity (AC).
Modified attack requirements (MAT:X)
Not defined: scoring uses the Base Attack Requirements (AT).
Modified privileges required (MPR:X)
Not defined: scoring uses the Base Privileges Required (PR).
Modified user interaction (MUI:X)
Not defined: scoring uses the Base User Interaction (UI).
Modified vulnerable system confidentiality impact (MVC:X)
Not defined: scoring uses the Base VC metric.
Modified vulnerable system integrity impact (MVI:X)
Not defined: scoring uses the Base VI metric.
Modified vulnerable system availability impact (MVA:X)
Not defined: scoring uses the Base VA metric.
Modified subsequent system confidentiality impact (MSC:X)
Not defined: scoring uses the Base SC metric.
Modified subsequent system integrity impact (MSI:X)
Not defined: scoring uses the Base SI metric.
Modified subsequent system availability impact (MSA:X)
Not defined: scoring uses the Base SA metric.
Safety (supplemental) (S:X)
Not evaluated.
Automatable (supplemental) (AU:X)
Not evaluated.
Recovery (supplemental) (R:X)
Not evaluated.
Value density (supplemental) (V:X)
Not evaluated.
Vulnerability response effort (supplemental) (RE:X)
Not evaluated.
Provider urgency (supplemental) (U:X)
Not evaluated.
 — — [email protected]
3.1 3.1 LOW
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 1.6 1.4 [email protected]
3.7 3.1 LOW
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 2.2 1.4 [email protected]
2.6 2.0 LOW
AV:N/AC:H/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:H)
Exploitation requires uncommon or highly specific conditions.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 4.9 2.9 [email protected]

Weakness enumeration for CVE-2025-4215

OS Trackers for CVE-2025-4215

vendor priority summary link
debian not yet assigned CVE-2025-4215 not yet assigned priority: Debian including 1 source packages (ublock-origin), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2025-4215
ubuntu medium CVE-2025-4215 medium priority: Ubuntu including 1 source packages (ublock-origin), 9 status rows across 9 suites (bionic, focal, jammy, noble, oracular, plucky, questing, upstream, xenial): needs-triage 6, DNE 3. https://ubuntu.com/security/CVE-2025-4215

Affected software / configurations for CVE-2025-4215

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

References for CVE-2025-4215

cvelogic Threat Intelligence