CVE-2025-8040
Mozilla Firefox and Thunderbird Memory Corruption Vulnerability
Description
Memory safety bugs present in Firefox ESR 140.0, Thunderbird ESR 140.0, Firefox 140 and Thunderbird 140. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 141, Firefox ESR < 140.1, Thunderbird < 141, and Thunderbird < 140.1.
INFO
Published Date :
July 22, 2025, 9:15 p.m.
Last Modified :
July 30, 2025, 5:15 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2025-8040
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 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Upgrade Firefox and Thunderbird to the latest versions.
- Update all affected packages.
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-2025-8040.
| URL | Resource |
|---|---|
| https://bugzilla.mozilla.org/buglist.cgi?bug_id=1975058%2C1975998 | |
| https://www.mozilla.org/security/advisories/mfsa2025-56/ | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2025-59/ | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2025-61/ | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2025-63/ | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-8040 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-2025-8040
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).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-8040 vulnerability anywhere in the article.
-
CybersecurityNews
Firefox 141 Released With Fix for Multiple Vulnerabilities – Update Now
Mozilla has released Firefox 141 to address 17 security vulnerabilities, including several high-impact flaws that could potentially allow arbitrary code execution. The Mozilla Foundation Security Advi ... Read more
The following table lists the changes that have been made to the
CVE-2025-8040 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 [email protected]
Jul. 30, 2025
Action Type Old Value New Value Added Reference https://bugzilla.mozilla.org/buglist.cgi?bug_id=1975058%2C1975998 Removed Reference https://bugzilla.mozilla.org/buglist.cgi?bug_id=1975058%2C1975058%2C1975998%2C1975998 Removed Reference Type https://bugzilla.mozilla.org/buglist.cgi?bug_id=1975058%2C1975058%2C1975998%2C1975998 Types: Broken Link -
Initial Analysis by [email protected]
Jul. 28, 2025
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:* versions up to (excluding) 141.0 *cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:* versions up to (excluding) 141.0 *cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* versions up to (excluding) 140.1 *cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:* versions up to (excluding) 140.1 Added Reference Type Mozilla Corporation: https://bugzilla.mozilla.org/buglist.cgi?bug_id=1975058%2C1975058%2C1975998%2C1975998 Types: Broken Link Added Reference Type Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2025-56/ Types: Vendor Advisory Added Reference Type Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2025-59/ Types: Vendor Advisory Added Reference Type Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2025-61/ Types: Vendor Advisory Added Reference Type Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2025-63/ Types: Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 23, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Added CWE CWE-119 -
New CVE Received by [email protected]
Jul. 22, 2025
Action Type Old Value New Value Added Description Memory safety bugs present in Firefox ESR 140.0, Thunderbird ESR 140.0, Firefox 140 and Thunderbird 140. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 141, Firefox ESR < 140.1, Thunderbird < 141, and Thunderbird < 140.1. Added Reference https://bugzilla.mozilla.org/buglist.cgi?bug_id=1975058%2C1975058%2C1975998%2C1975998 Added Reference https://www.mozilla.org/security/advisories/mfsa2025-56/ Added Reference https://www.mozilla.org/security/advisories/mfsa2025-59/ Added Reference https://www.mozilla.org/security/advisories/mfsa2025-61/ Added Reference https://www.mozilla.org/security/advisories/mfsa2025-63/