🛡️ CVE-2025-1010 — firefox

🟠 CVSS 8.8 — High ✅ No Known Exploit CWE-416 NVD

8.8

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

An attacker could have caused a use-after-free via the Custom Highlight API, leading to a potentially exploitable crash. This vulnerability was fixed in Firefox 135, Firefox ESR 115.20, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.

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-2025-1010 is classified as CWE-416: Use After Free. Memory is used after being released, so its contents may already belong to something else.

Affected software

CVE-2025-1010 is recorded against 2 packages.

firefox (from 128.1.0 up to 128.7.0)
thunderbird (from 131.0 up to 135.0)

Timeline and source

Published on 4 February 2025 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
www.mozilla.org
www.mozilla.org
lists.debian.org
lists.debian.org

CVE-2025-1010 on other distributions

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

Debian Ubuntu

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-416

Public Exploit ✅ No

Source NVD

Published 2025-02-04

Updated 2026-08-11

Modified 2026-06-17

Fix URL N/A

Affected Packages

Software	From version	Fixed in
firefox	128.1.0	128.7.0
thunderbird	131.0	135.0

References

Permissions Required https://bugzilla.mozilla.org/show_bug.cgi?id=1936982

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2025-07/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2025-08/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2025-09/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2025-10/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2025-11/

https://lists.debian.org/debian-lts-announce/2025/02/msg00005.html

https://lists.debian.org/debian-lts-announce/2025/02/msg00006.html

🔗 NVD 🔗 Mitre

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