Vulnerability · Published May 17, 2025 · Assigned by mozilla
CVE-2025-4919Out-of-bounds access when optimizing linear sums
High 8.8
In plain English
A high-severity out-of-bounds read in Firefox from Mozilla. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 9.1% (higher than 95% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)8.8High
Exploit odds (30 days)9.1%top 4.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
An attacker was able to perform an out-of-bounds read or write on a JavaScript object by confusing array index sizes. This vulnerability was fixed in Firefox 138.0.4, Firefox ESR 128.10.1, Firefox ESR 115.23.1, Thunderbird 128.10.2, and Thunderbird 138.0.2.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | firefox | 128.10.1-1.el10_0 | ALSA-2025:8125 |
| AlmaLinux:8 | firefox | 128.10.1-1.el8_10.alma.1 | ALSA-2025:8060 |
| AlmaLinux:9 | firefox | 128.10.1-1.el9_6.alma.1 | ALSA-2025:8049 |
| AlmaLinux:9 | firefox-x11 | 128.10.1-1.el9_6.alma.1 | ALSA-2025:8049 |
| AlmaLinux:10 | thunderbird | 128.11.0-1.el10_0.alma.1 | ALSA-2025:8608 |
| AlmaLinux:8 | thunderbird | 128.11.0-1.el8_10.alma.1 | ALSA-2025:8756 |
| AlmaLinux:9 | thunderbird | 128.11.0-1.el9_6.alma.1 | ALSA-2025:8607 |
| Debian:12 | firefox-esr | 128.10.1esr-1~deb12u1 | DEBIAN-CVE-2025-4919 |
| Debian:12 | firefox-esr | 128.10.1esr-1~deb12u1 | DSA-5922-1 |
| Debian:13 | firefox-esr | 128.10.1esr-1 | DEBIAN-CVE-2025-4919 |
| Debian:14 | firefox-esr | 128.10.1esr-1 | DEBIAN-CVE-2025-4919 |
| Debian:12 | thunderbird | 1:128.11.0esr-1~deb12u1 | DSA-5932-1 |
| Debian:12 | thunderbird | 1:128.11.0esr-1~deb12u1 | DEBIAN-CVE-2025-4919 |
| Debian:13 | thunderbird | 1:128.11.0esr-1 | DEBIAN-CVE-2025-4919 |
| Debian:14 | thunderbird | 1:128.11.0esr-1 | DEBIAN-CVE-2025-4919 |
| Rocky Linux:10 | firefox | 0:128.10.1-1.el10_0 | RLSA-2025:8125 |
| Rocky Linux:8 | firefox | 0:128.10.1-1.el8_10 | RLSA-2025:8060 |
| Rocky Linux:10 | thunderbird | 0:128.11.0-1.el10_0 | RLSA-2025:8608 |
| Rocky Linux:8 | thunderbird | 0:128.11.0-1.el8_10 | RLSA-2025:8756 |
| Rocky Linux:9 | thunderbird | 0:128.11.0-1.el9_6 | RLSA-2025:8607 |
| Ubuntu:22.04:LTS | mozjs102 | no fix listed | UBUNTU-CVE-2025-4919 |
| Ubuntu:24.04:LTS | mozjs102 | no fix listed | UBUNTU-CVE-2025-4919 |
| Ubuntu:24.04:LTS | mozjs115 | no fix listed | UBUNTU-CVE-2025-4919 |
| Ubuntu:22.04:LTS | mozjs78 | no fix listed | UBUNTU-CVE-2025-4919 |
| Ubuntu:22.04:LTS | mozjs91 | no fix listed | UBUNTU-CVE-2025-4919 |
| Ubuntu:22.04:LTS | thunderbird | 1:128.12.0+build1-0ubuntu0.22.04.1 | UBUNTU-CVE-2025-4919 |
| Ubuntu:22.04:LTS | thunderbird | 1:128.12.0+build1-0ubuntu0.22.04.1 | USN-7663-1 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | see references |
| Mozilla | Thunderbird | see references |
Weakness: CWE-125, CWE-787 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1966614
- https://www.mozilla.org/security/advisories/mfsa2025-36/
- https://www.mozilla.org/security/advisories/mfsa2025-37/
- https://www.mozilla.org/security/advisories/mfsa2025-38/
- https://www.mozilla.org/security/advisories/mfsa2025-40/
- https://www.mozilla.org/security/advisories/mfsa2025-41/
- https://lists.debian.org/debian-lts-announce/2025/05/msg00046.html
- https://lists.debian.org/debian-lts-announce/2025/05/msg00024.html