🛡️ CVE-2024-4778 on Ubuntu — firefox

Distribution advisory

This page covers CVE-2024-4778 as tracked by Ubuntu, for the package firefox. The fix is available in version 126.0+build2-0ubuntu0.20.04.1; earlier versions remain affected.

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. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

• Attack vector: Network — reachable from anywhere that can route to the service.
• Attack complexity: Low — the attack works reliably, with no preparation.
• Privileges required: None — an unauthenticated stranger can try it.
• User interaction: None — nobody has to be tricked into anything.
• Scope: Unchanged — the damage stays inside the vulnerable component.
• Confidentiality impact: High — total loss, or loss the attacker controls.
• Integrity impact: High — total loss, or loss the attacker controls.
• Availability impact: High — total loss, or loss the attacker controls.

Weakness class

UBUNTU-CVE-2024-4778 is classified as CWE-1260: Improper Handling of Overlap Between Protected Memory Ranges. The product allows address regions to overlap, which can result in the bypassing of intended memory protection.

Affected software

UBUNTU-CVE-2024-4778 is recorded against 7 packages.

• firefox (fixed in 126.0+build2-0ubuntu0.20.04.1)
• mozjs102
• mozjs38
• mozjs52
• mozjs68
• mozjs78
• mozjs91

Timeline and source

Published on 14 May 2024 and last revised on 22 April 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

ubuntu.com (Report)
www.cve.org (Report)
www.mozilla.org (Report)
bugzilla.mozilla.org (Report)
www.mozilla.org (Report)
ubuntu.com (Advisory)

Other advisories for this package

firefox has other advisories on record. If you are patching this one, these are worth checking on the same host:

• MGASA-2026-0325 (published 7 Aug 2026)
• CGA-7vrr-xf3x-xg6q (published 30 Jul 2026)
• CGA-r6wh-4xxp-mwjg (published 30 Jul 2026)
• CGA-8cj2-h7vq-gj2g (published 30 Jul 2026)

Same weakness in other software

These advisories are the same class of weakness (CWE-1260: Improper Handling of Overlap Between Protected Memory Ranges) in other software:

• CVE-2025-0012 (published 10 Feb 2026)
• CVE-2025-29948 (published 10 Feb 2026)
• CVE-2025-22889 (7.9 High, published 12 Aug 2025)
• CVE-2025-1937 (7.5 High, published 4 Mar 2025)
• CVE-2024-4778 (9.8 Critical, published 14 May 2024)
• CVE-2022-27813 (8.1 High, published 19 Oct 2023)

CVE-2024-4778 on other distributions

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

Details

Affected Packages

References