CVE-2025-1012
"Firefox/Thunderbird Use-After-Free Vulnerability"
Description
A race during concurrent delazification could have led to a use-after-free. This vulnerability affects Firefox < 135, Firefox ESR < 115.20, Firefox ESR < 128.7, Thunderbird < 128.7, and Thunderbird < 135.
INFO
Published Date :
Feb. 4, 2025, 2:15 p.m.
Last Modified :
Nov. 3, 2025, 9:18 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2025-1012
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | CRITICAL | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Update Firefox to version 135 or later.
- Update Firefox ESR to version 115.20 or later.
- Update Firefox ESR to version 128.7 or later.
- Update Thunderbird to version 128.7 or later.
Public PoC/Exploit Available at Github
CVE-2025-1012 has a 3 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-1012.
| URL | Resource |
|---|---|
| https://bugzilla.mozilla.org/show_bug.cgi?id=1939710 | Permissions Required |
| 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/ | Vendor Advisory |
| https://lists.debian.org/debian-lts-announce/2025/02/msg00005.html | |
| https://lists.debian.org/debian-lts-announce/2025/02/msg00006.html |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-1012 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-1012
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
Dockerfile Shell Swift Python C TypeScript Starlark C++ Cap'n Proto JavaScript
None
Dockerfile Shell Swift JavaScript Python C
A JavaScript Engine Fuzzer
C Swift Shell Dockerfile JavaScript Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-1012 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-1012 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 03, 2025
Action Type Old Value New Value Added Reference https://lists.debian.org/debian-lts-announce/2025/02/msg00005.html Added Reference https://lists.debian.org/debian-lts-announce/2025/02/msg00006.html -
Initial Analysis by [email protected]
Feb. 06, 2025
Action Type Old Value New Value Added CVSS V3.1 NIST AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Added CWE NIST CWE-416 Added CPE Configuration OR *cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* versions up to (excluding) 115.20.0 *cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* versions from (including) 128.1.0 up to (excluding) 128.7.0 *cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:* versions up to (excluding) 135.0 *cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:* versions from (including) 128.0.1 up to (excluding) 128.7.0 *cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:* versions up to (excluding) 135.0 Changed Reference Type https://bugzilla.mozilla.org/show_bug.cgi?id=1939710 No Types Assigned https://bugzilla.mozilla.org/show_bug.cgi?id=1939710 Permissions Required Changed Reference Type https://www.mozilla.org/security/advisories/mfsa2025-07/ No Types Assigned https://www.mozilla.org/security/advisories/mfsa2025-07/ Vendor Advisory Changed Reference Type https://www.mozilla.org/security/advisories/mfsa2025-08/ No Types Assigned https://www.mozilla.org/security/advisories/mfsa2025-08/ Vendor Advisory Changed Reference Type https://www.mozilla.org/security/advisories/mfsa2025-09/ No Types Assigned https://www.mozilla.org/security/advisories/mfsa2025-09/ Vendor Advisory Changed Reference Type https://www.mozilla.org/security/advisories/mfsa2025-10/ No Types Assigned https://www.mozilla.org/security/advisories/mfsa2025-10/ Vendor Advisory Changed Reference Type https://www.mozilla.org/security/advisories/mfsa2025-11/ No Types Assigned https://www.mozilla.org/security/advisories/mfsa2025-11/ Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Feb. 05, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-416 -
New CVE Received by [email protected]
Feb. 04, 2025
Action Type Old Value New Value Added Description A race during concurrent delazification could have led to a use-after-free. This vulnerability affects Firefox < 135, Firefox ESR < 115.20, Firefox ESR < 128.7, Thunderbird < 128.7, and Thunderbird < 135. Added Reference https://bugzilla.mozilla.org/show_bug.cgi?id=1939710 Added Reference https://www.mozilla.org/security/advisories/mfsa2025-07/ Added Reference https://www.mozilla.org/security/advisories/mfsa2025-08/ Added Reference https://www.mozilla.org/security/advisories/mfsa2025-09/ Added Reference https://www.mozilla.org/security/advisories/mfsa2025-10/ Added Reference https://www.mozilla.org/security/advisories/mfsa2025-11/