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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...
Description
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, and Firefox ESR < 128.8.
Classification
CVE ID: CVE-2025-1933
Problem Types
JIT corruption of WASM i32 return values on 64-bit CPUsAffected Products
Vendor: Mozilla, Mozilla, Mozilla
Product: Firefox, Firefox ESR, Firefox ESR
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.14% (probability of being exploited)
EPSS Percentile: 30.25% (scored less or equal to compared to others)
EPSS Date: 2025-04-02 (when was this score calculated)
References
https://nvd.nist.gov/vuln/detail/CVE-2025-1933https://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/