CVE-2025-1933 — Unchecked Return Value in Mozilla Firefox

CWE-252 — Unchecked Return ValueCWE-843 — Type Confusion14 documents8 sources
Severity
7.6HIGHNVD
OSV7.5
EPSS
0.4%
top 38.88%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Mozilla ThunderbirdMozilla Firefox
Timeline
PublishedMar 4
Latest updateJul 22

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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:HExploitability: 2.8 | Impact: 4.7

Affected Packages4 packages

▶NVDmozilla/firefox116.0 — 128.8.0+2
▶Ubuntumozilla/firefox< 136.0+build3-0ubuntu0.20.04.1
▶NVDmozilla/thunderbird129.0 — 136.0+1
▶Debianmozilla/thunderbird< 1:128.8.0esr-1~deb11u1+3

🔴Vulnerability Details

4
OSV
firefox vulnerabilities↗2025-03-06
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GHSA
GHSA-r84f-4wj3-r6vx: On 64-bit CPUs, when the JIT compiles WASM i32 return values they can pick up bits from left over memory↗2025-03-04
▶
OSV
CVE-2025-1933: On 64-bit CPUs, when the JIT compiles WASM i32 return values they can pick up bits from left over memory↗2025-03-04
▶
CVEList
JIT corruption of WASM i32 return values on 64-bit CPUs↗2025-03-04
▶

📋Vendor Advisories

9
Ubuntu
Thunderbird vulnerabilities↗2025-07-22
▶
Ubuntu
Firefox vulnerabilities↗2025-03-06
▶
Red Hat
firefox: JIT corruption of WASM i32 return values on 64-bit CPUs↗2025-03-04
▶
Debian
CVE-2025-1933: firefox - On 64-bit CPUs, when the JIT compiles WASM i32 return values they can pick up bi...↗2025
▶
Mozilla
Mozilla Foundation Security Advisory 2025-18: CVE-2025-1933↗
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CVE-2025-1933 — Unchecked Return Value in Mozilla | cvebase