CVE-2025-1942

EUVD-2025-7444
When String.toUpperCase() caused a string to get longer it was possible for uninitialized memory to be incorporated into the result string This vulnerability affects Firefox < 136 and Thunderbird < 136.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
9.8 CRITICAL
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA-ADPADP
9.8 CRITICAL
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 58%
Affected Products (NVD)
VendorProductVersion
mozillafirefox
𝑥
< 136.0
mozillathunderbird
𝑥
< 136.0
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
firefox
sid
148.0-1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
firefox
focal
Fixed 136.0+build3-0ubuntu0.20.04.1
released
jammy
not-affected
noble
not-affected
oracular
not-affected
plucky
not-affected
questing
not-affected
thunderbird
focal
dne
jammy
Fixed 1:140.7.1+build1-0ubuntu0.22.04.1
released
noble
not-affected
oracular
not-affected
plucky
not-affected
questing
not-affected
mozjs38
bionic
needs-triage
focal
dne
jammy
dne
noble
dne
oracular
dne
plucky
dne
questing
dne
mozjs52
bionic
ignored
focal
needs-triage
jammy
dne
noble
dne
oracular
dne
plucky
dne
questing
dne
mozjs68
focal
ignored
jammy
dne
noble
dne
oracular
dne
plucky
dne
questing
dne
mozjs78
focal
dne
jammy
ignored
noble
dne
oracular
dne
plucky
dne
questing
dne
mozjs91
focal
dne
jammy
ignored
noble
dne
oracular
dne
plucky
dne
questing
dne
mozjs102
focal
dne
jammy
ignored
noble
ignored
oracular
dne
plucky
dne
questing
dne
mozjs115
focal
dne
jammy
dne
noble
ignored
oracular
ignored
plucky
ignored
questing
dne
Common Weakness Enumeration
References
https://bugzilla.mozilla.org/show_bug.cgi?id=1947139
https://www.mozilla.org/security/advisories/mfsa2025-14/
https://www.mozilla.org/security/advisories/mfsa2025-17/