🛡️ CVE-2024-7520 — firefox

🟠 CVSS 8.8 — High ✅ No Known Exploit CWE-843 NVD
8.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

A type confusion bug in WebAssembly could be leveraged by an attacker to potentially achieve code execution. This vulnerability affects Firefox < 129, Firefox ESR < 128.1, and Thunderbird < 128.1.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2024-7520 is classified as CWE-843: Type Confusion. A resource is accessed as one type while actually being another, so the interpretation of its memory is wrong.

Affected software

CVE-2024-7520 is recorded against 3 packages.

  • firefox (fixed in 129.0)
  • firefox-esr (fixed in 128.1.0)
  • thunderbird (fixed in 128.1.0)

Timeline and source

Published on 6 August 2024 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

bugzilla.mozilla.org
www.mozilla.org
www.mozilla.org
www.mozilla.org

CVE-2024-7520 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity HIGH
CVSS Score 8.8
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE CWE-843
Public Exploit ✅ No
Source NVD
Published 2024-08-06
Updated 2026-08-11
Modified 2026-06-17
Fix URL N/A

Affected Packages

Software From version Fixed in
firefox — 129.0
firefox-esr — 128.1.0
thunderbird — 128.1.0

Similar Threats

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