CVE-2025-6425

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 affects Firefox < 140, Firefox ESR < 115.25, Firefox ESR < 128.12, Thunderbird < 140, and Thunderbird < 128.12.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
4.3 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
mozillaCNA
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CISA-ADPADP
4.3 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 21%
VendorProductVersion
mozillafirefox
𝑥
< 115.25.0
mozillafirefox
𝑥
< 140.0
mozillafirefox
116.0 ≤
𝑥
< 128.12.0
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
firefox
sid
141.0.3-1
fixed
firefox-esr
bullseye
vulnerable
bullseye (security)
128.13.0esr-1~deb11u1
fixed
bookworm
vulnerable
bookworm (security)
128.13.0esr-1~deb12u1
fixed
forky
128.13.0esr-1
fixed
sid
128.13.0esr-1
fixed
trixie
128.13.0esr-1
fixed
thunderbird
bullseye
vulnerable
bullseye (security)
1:128.13.0esr-1~deb11u1
fixed
bookworm
vulnerable
bookworm (security)
1:128.13.0esr-1~deb12u1
fixed
forky
1:128.13.0esr-1
fixed
sid
1:128.13.0esr-1
fixed
trixie
1:128.13.0esr-1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
firefox
plucky
not-affected
oracular
not-affected
noble
not-affected
jammy
not-affected
thunderbird
plucky
not-affected
oracular
not-affected
noble
not-affected
jammy
Fixed 1:128.12.0+build1-0ubuntu0.22.04.1
released
mozjs38
plucky
dne
oracular
dne
noble
dne
jammy
dne
bionic
needs-triage
mozjs52
plucky
dne
oracular
dne
noble
dne
jammy
dne
focal
ignored
bionic
ignored
mozjs68
plucky
dne
oracular
dne
noble
dne
jammy
dne
focal
ignored
mozjs78
plucky
dne
oracular
dne
noble
dne
jammy
ignored
mozjs91
plucky
dne
oracular
dne
noble
dne
jammy
ignored
mozjs102
plucky
dne
oracular
dne
noble
ignored
jammy
ignored
mozjs115
plucky
ignored
oracular
ignored
noble
ignored
jammy
dne
Common Weakness Enumeration
References
https://bugzilla.mozilla.org/show_bug.cgi?id=1717672
https://www.mozilla.org/security/advisories/mfsa2025-51/
https://www.mozilla.org/security/advisories/mfsa2025-52/
https://www.mozilla.org/security/advisories/mfsa2025-53/
https://www.mozilla.org/security/advisories/mfsa2025-54/
https://www.mozilla.org/security/advisories/mfsa2025-55/