Vulnerability · Published Mar 4, 2025 · Assigned by mozilla
CVE-2025-1933JIT corruption of WASM i32 return values on 64-bit CPUs
High 7.6
In plain English
A high-severity security flaw in Firefox from Mozilla. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.6High
Exploit odds (30 days)0.3%top 75.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 was fixed in Firefox 136, Firefox ESR 115.21, Firefox ESR 128.8, Thunderbird 136, and Thunderbird 128.8.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | firefox | 128.8.0-1.el8_10 | ALSA-2025:2452 |
| AlmaLinux:9 | firefox | 128.8.0-1.el9_5 | ALSA-2025:2359 |
| AlmaLinux:9 | firefox-x11 | 128.8.0-1.el9_5 | ALSA-2025:2359 |
| Debian:12 | firefox-esr | 128.8.0esr-1~deb12u1 | DSA-5874-1 |
| Debian:12 | firefox-esr | 128.8.0esr-1~deb12u1 | DEBIAN-CVE-2025-1933 |
| Debian:13 | firefox-esr | 128.8.0esr-1 | DEBIAN-CVE-2025-1933 |
| Debian:14 | firefox-esr | 128.8.0esr-1 | DEBIAN-CVE-2025-1933 |
| Debian:12 | thunderbird | 1:128.8.0esr-1~deb12u1 | DEBIAN-CVE-2025-1933 |
| Debian:12 | thunderbird | 1:128.8.0esr-1~deb12u1 | DSA-5876-1 |
| Debian:13 | thunderbird | 1:128.8.0esr-1 | DEBIAN-CVE-2025-1933 |
| Debian:14 | thunderbird | 1:128.8.0esr-1 | DEBIAN-CVE-2025-1933 |
| Rocky Linux:8 | firefox | 0:128.8.0-1.el8_10 | RLSA-2025:2452 |
| Ubuntu:22.04:LTS | mozjs102 | no fix listed | UBUNTU-CVE-2025-1933 |
| Ubuntu:24.04:LTS | mozjs102 | no fix listed | UBUNTU-CVE-2025-1933 |
| Ubuntu:24.04:LTS | mozjs115 | no fix listed | UBUNTU-CVE-2025-1933 |
| Ubuntu:22.04:LTS | mozjs78 | no fix listed | UBUNTU-CVE-2025-1933 |
| Ubuntu:22.04:LTS | mozjs91 | no fix listed | UBUNTU-CVE-2025-1933 |
| Ubuntu:22.04:LTS | thunderbird | 1:128.12.0+build1-0ubuntu0.22.04.1 | UBUNTU-CVE-2025-1933 |
| Ubuntu:22.04:LTS | thunderbird | 1:128.12.0+build1-0ubuntu0.22.04.1 | USN-7663-1 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | see references |
| Mozilla | Thunderbird | see references |
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/
- https://lists.debian.org/debian-lts-announce/2025/03/msg00006.html