CVE-2025-1933

On 64-bit CPUs, when the JIT compiles WASM i32 return values they can pick up bits from left over memory. This can potentially cause them to be treated as a different type. This vulnerability affects Firefox < 136, Firefox ESR < 115.21, Firefox ESR < 128.8, Thunderbird < 136, and Thunderbird < 128.8.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
7.6 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
mozillaCNA
---
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CISA-ADPADP
7.6 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 39%
VendorProductVersion
mozillafirefox
𝑥
< 115.21.0
mozillafirefox
𝑥
< 136.0
mozillafirefox
116.0 ≤
𝑥
< 128.8.0
mozillathunderbird
𝑥
< 128.8
mozillathunderbird
129.0 ≤
𝑥
< 136.0
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
firefox
sid
140.0.4-1
fixed
firefox-esr
bullseye
vulnerable
bullseye (security)
128.12.0esr-1~deb11u1
fixed
bookworm
128.10.0esr-1~deb12u1
fixed
bookworm (security)
128.12.0esr-1~deb12u1
fixed
trixie
128.11.0esr-1
fixed
sid
128.12.0esr-1
fixed
thunderbird
bullseye
vulnerable
bullseye (security)
1:128.12.0esr-1~deb11u1
fixed
bookworm
1:128.10.0esr-1~deb12u1
fixed
bookworm (security)
1:128.12.0esr-1~deb12u1
fixed
trixie
1:128.12.0esr-1
fixed
sid
1:128.12.0esr-1
fixed
References
https://bugzilla.mozilla.org/show_bug.cgi?id=1946004
https://www.mozilla.org/security/advisories/mfsa2025-14/
https://www.mozilla.org/security/advisories/mfsa2025-15/
https://www.mozilla.org/security/advisories/mfsa2025-16/
https://www.mozilla.org/security/advisories/mfsa2025-17/
https://www.mozilla.org/security/advisories/mfsa2025-18/