CVE-2025-4918
Firefox ESR JavaScript Promise Out-of-Bounds Access
Description
An attacker was able to perform an out-of-bounds read or write on a JavaScript `Promise` object. This vulnerability affects Firefox < 138.0.4, Firefox ESR < 128.10.1, Firefox ESR < 115.23.1, Thunderbird < 128.10.2, and Thunderbird < 138.0.2.
INFO
Published Date :
May 17, 2025, 10:15 p.m.
Last Modified :
May 28, 2025, 2:05 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
3.6
Exploitability Score :
3.9
Public PoC/Exploit Available at Github
CVE-2025-4918 has a 3 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
Affected Products
The following products are affected by CVE-2025-4918
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.
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-2025-4918.
| URL | Resource |
|---|---|
| https://bugzilla.mozilla.org/show_bug.cgi?id=1966612 | Permissions Required |
| https://www.mozilla.org/security/advisories/mfsa2025-36/ | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2025-37/ | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2025-38/ | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2025-40/ | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2025-41/ | Vendor Advisory |
| https://www.vicarius.io/vsociety/posts/cve-2025-4918-detect-firefox-out-of-bounds-write | Third Party Advisory Exploit |
| https://www.vicarius.io/vsociety/posts/cve-2025-4918-mitigate-firefox-out-of-bounds-write | Third Party Advisory Exploit |
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).
CVE-2025-4918 – Out-of-Bounds Memory Corruption in Mozilla Firefox
None
CVE-2025-4918 – Out-of-Bounds Memory Corruption in Mozilla Firefox
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-4918 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-4918 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.
-
Initial Analysis by [email protected]
May. 28, 2025
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:* versions up to (excluding) 138.0.4 *cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* versions up to (excluding) 115.23.1 *cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* versions from (including) 116.0 up to (excluding) 128.10.1 *cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* versions up to (excluding) 128.10.2 *cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:* versions from (including) 138.0 up to (excluding) 138.0.2 Added Reference Type Mozilla Corporation: https://bugzilla.mozilla.org/show_bug.cgi?id=1966612 Types: Permissions Required Added Reference Type Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2025-36/ Types: Vendor Advisory Added Reference Type Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2025-37/ Types: Vendor Advisory Added Reference Type Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2025-38/ Types: Vendor Advisory Added Reference Type Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2025-40/ Types: Vendor Advisory Added Reference Type Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2025-41/ Types: Vendor Advisory Added Reference Type CVE: https://www.vicarius.io/vsociety/posts/cve-2025-4918-detect-firefox-out-of-bounds-write Types: Exploit, Third Party Advisory Added Reference Type CVE: https://www.vicarius.io/vsociety/posts/cve-2025-4918-mitigate-firefox-out-of-bounds-write Types: Exploit, Third Party Advisory -
CVE Modified by [email protected]
May. 22, 2025
Action Type Old Value New Value Changed Description An attacker was able to perform an out-of-bounds read or write on a JavaScript `Promise` object. This vulnerability affects Firefox < 138.0.4, Firefox ESR < 128.10.1, and Firefox ESR < 115.23.1. An attacker was able to perform an out-of-bounds read or write on a JavaScript `Promise` object. This vulnerability affects Firefox < 138.0.4, Firefox ESR < 128.10.1, Firefox ESR < 115.23.1, Thunderbird < 128.10.2, and Thunderbird < 138.0.2. Added Reference https://www.mozilla.org/security/advisories/mfsa2025-40/ Added Reference https://www.mozilla.org/security/advisories/mfsa2025-41/ -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
May. 21, 2025
Action Type Old Value New Value Added Reference https://www.vicarius.io/vsociety/posts/cve-2025-4918-detect-firefox-out-of-bounds-write Added Reference https://www.vicarius.io/vsociety/posts/cve-2025-4918-mitigate-firefox-out-of-bounds-write -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
May. 19, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Added CWE CWE-125 -
CVE Modified by [email protected]
May. 18, 2025
Action Type Old Value New Value Changed Description An attacker was able to perform an out-of-bounds read or write on a JavaScript `Promise` object. This vulnerability affects Firefox ESR < 115.23.1. An attacker was able to perform an out-of-bounds read or write on a JavaScript `Promise` object. This vulnerability affects Firefox < 138.0.4, Firefox ESR < 128.10.1, and Firefox ESR < 115.23.1. Added Reference https://www.mozilla.org/security/advisories/mfsa2025-36/ Added Reference https://www.mozilla.org/security/advisories/mfsa2025-37/ -
New CVE Received by [email protected]
May. 17, 2025
Action Type Old Value New Value Added Description An attacker was able to perform an out-of-bounds read or write on a JavaScript `Promise` object. This vulnerability affects Firefox ESR < 115.23.1. Added Reference https://bugzilla.mozilla.org/show_bug.cgi?id=1966612 Added Reference https://www.mozilla.org/security/advisories/mfsa2025-38/
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-4918 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-2025-4918
weaknesses.