Vulnerability · Published Apr 29, 2025 · Assigned by mozilla
CVE-2025-4091Memory safety bugs fixed in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10
High 8.1
In plain English
A high-severity memory corruption 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 0.5% (higher than 43% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Memory safety bugs present in Firefox 137, Thunderbird 137, Firefox ESR 128.9, and Thunderbird 128.9. 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 was fixed in Firefox 138, Firefox ESR 128.10, Thunderbird 138, and Thunderbird 128.10.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | firefox | 128.10.0-1.el10_0 | ALSA-2025:7506 |
| AlmaLinux:8 | firefox | 128.10.0-1.el8_10.alma.1 | ALSA-2025:4458 |
| AlmaLinux:9 | firefox | 128.10.0-1.el9_5.alma.1 | ALSA-2025:4443 |
| AlmaLinux:9 | firefox | 128.10.0-1.el9_6.alma.1 | ALSA-2025:7428 |
| AlmaLinux:9 | firefox-x11 | 128.10.0-1.el9_6.alma.1 | ALSA-2025:7428 |
| AlmaLinux:9 | firefox-x11 | 128.10.0-1.el9_5.alma.1 | ALSA-2025:4443 |
| AlmaLinux:10 | thunderbird | 128.10.0-1.el10_0.alma.1 | ALSA-2025:7507 |
| AlmaLinux:8 | thunderbird | 128.10.0-1.el8_10.alma.1 | ALSA-2025:4797 |
| AlmaLinux:9 | thunderbird | 128.10.0-1.el9_5.alma.1 | ALSA-2025:4460 |
| Debian:12 | firefox-esr | 128.10.0esr-1~deb12u1 | DSA-5910-1 |
| Debian:12 | firefox-esr | 128.10.0esr-1~deb12u1 | DEBIAN-CVE-2025-4091 |
| Debian:13 | firefox-esr | 128.10.0esr-1 | DEBIAN-CVE-2025-4091 |
| Debian:14 | firefox-esr | 128.10.0esr-1 | DEBIAN-CVE-2025-4091 |
| Debian:12 | thunderbird | 1:128.10.0esr-1~deb12u1 | DSA-5912-1 |
| Debian:12 | thunderbird | 1:128.10.0esr-1~deb12u1 | DEBIAN-CVE-2025-4091 |
| Debian:13 | thunderbird | 1:128.10.0esr-1 | DEBIAN-CVE-2025-4091 |
| Debian:14 | thunderbird | 1:128.10.0esr-1 | DEBIAN-CVE-2025-4091 |
| Rocky Linux:8 | firefox | 0:128.10.0-1.el8_10 | RLSA-2025:4458 |
| Rocky Linux:9 | firefox | 0:128.10.0-1.el9_5 | RLSA-2025:4443 |
| Rocky Linux:9 | firefox | 0:128.10.0-1.el9_5 | RLSA-2025:7428 |
| Rocky Linux:8 | thunderbird | 0:128.10.0-1.el8_10 | RLSA-2025:4797 |
| Rocky Linux:9 | thunderbird | 0:128.10.0-1.el9_5 | RLSA-2025:4460 |
| Ubuntu:22.04:LTS | mozjs102 | no fix listed | UBUNTU-CVE-2025-4091 |
| Ubuntu:24.04:LTS | mozjs102 | no fix listed | UBUNTU-CVE-2025-4091 |
| Ubuntu:24.04:LTS | mozjs115 | no fix listed | UBUNTU-CVE-2025-4091 |
| Ubuntu:22.04:LTS | mozjs78 | no fix listed | UBUNTU-CVE-2025-4091 |
| Ubuntu:22.04:LTS | mozjs91 | no fix listed | UBUNTU-CVE-2025-4091 |
| Ubuntu:22.04:LTS | thunderbird | 1:128.12.0+build1-0ubuntu0.22.04.1 | UBUNTU-CVE-2025-4091 |
| 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-119 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- Memory safety bugs fixed in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10
- https://www.mozilla.org/security/advisories/mfsa2025-28/
- https://www.mozilla.org/security/advisories/mfsa2025-29/
- https://www.mozilla.org/security/advisories/mfsa2025-31/
- https://www.mozilla.org/security/advisories/mfsa2025-32/
- https://lists.debian.org/debian-lts-announce/2025/05/msg00024.html