CVE-2025-6425: mozilla firefox
CVSS: 4.3v3.1MediumModified
AliasesUBUNTU-CVE-2025-6425DEBIAN-CVE-2025-6425CGA-rfpm-7pcv-h9rxCGA-rrgc-mrpq-xfv3CGA-fgwm-6vmc-72xjCGA-q39j-w62r-rc6v
Published 24-06-2025Last modified 13-04-2026
Vulnerability summary
CVE-2025-6425 is a medium (CVSS 4.3) vulnerability in mozilla firefox. EPSS estimates a 0.31% chance of exploitation in the next 30 days, higher than 22.3% of scored vulnerabilities.
CVSS score
4.3/10
010
Medium · v3.1 (CVE.org)EPSS score
0.31%
0%100%
Low · +0.02 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 41 · Related 15DLA-4231-1DLA-4239-1DSA-5950-1DSA-5959-1MGASA-2025-0201MGASA-2025-0228OPENSUSE-SU-2025-20135-1OPENSUSE-SU-2025:15216-1OPENSUSE-SU-2025:15312-1OPENSUSE-SU-2025:15315-1OPENSUSE-SU-2025:15325-1OPENSUSE-SU-2025:20135-1RHSA-2025:10072RHSA-2025:10073RHSA-2025:10074RHSA-2025:10159RHSA-2025:10160RHSA-2025:10161RHSA-2025:10163RHSA-2025:10164RHSA-2025:10165RHSA-2025:10166RHSA-2025:10181RHSA-2025:10182RHSA-2025:10183RHSA-2025:10184RHSA-2025:10185RHSA-2025:10186RHSA-2025:10187RHSA-2025:10188RHSA-2025:10195RHSA-2025:10196RHSA-2025:10246SUSE-SU-2025:02122-1SUSE-SU-2025:02123-1SUSE-SU-2025:02339-1SUSE-SU-2025:02368-1SUSE-SU-2025:02529-1SUSE-SU-2025:02546-1SUSE-SU-2025:21170-1USN-7663-1CGA-2RCH-4QHR-X4VF
Timeline
- 24-06-2025PublishedVulnerability first disclosed.
- 13-04-2026Last modifiedVulnerability information updated.
Description
An attacker who enumerated resources from the WebCompat extension could have obtained a persistent UUID that identified the browser, and persisted between containers and normal/private browsing mode, but not profiles. This vulnerability was fixed in Firefox 140, Firefox ESR 115.25, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.
CVSS metrics
6 scores · 6 sources · 1 versionMedium 4.3Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:NSourcesAll 6 agree
- OSV · UbuntuEcosystem advisory · calculated4.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
- OSV · DebianEcosystem advisory · calculated4.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
- OSV · WolfiEcosystem advisory · calculated4.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
- OSV · ChainguardEcosystem advisory · calculated4.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
- NVDNIST4.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
EPSS trend
Probability
0.31%
Chance of exploitation in the next 30 days
Percentile
22%
Versus all other CVEs
30-day change
+0.02 pp
From 0.29% on 19-09-2026
19-09-202619-10-2026
EPSS score0.31%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu8 products
- mozjs102All versions (No fix recorded)
- mozjs115All versions (No fix recorded)
- mozjs38All versions (No fix recorded)
- mozjs52All versions (No fix recorded)
- mozjs68All versions (No fix recorded)
Chainguard2 products
- firefox< 128.12-r0
- firefox-esr< 115.25-r0
Debian2 products
- firefox-esr< 128.12.0esr-1~deb12u1 | < 128.12.0esr-1
- thunderbird< 1:128.12.0esr-1~deb12u1 | < 1:128.12.0esr-1
Mozilla1 product
- firefox< 115.25.0 | < 140.0 | ≥ 116.0, < 128.12.0
Wolfi1 product
- firefox< 128.12-r0
5 vendors · 14 products
