Vulnerability · Published Jan 7, 2025 · Assigned by mozilla
CVE-2025-0243Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 128.6, and Thunderbird 128.6
Medium 5.1
In plain English
A medium-severity security flaw 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 0.2% (higher than 16% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.1Medium
Exploit odds (30 days)0.2%top 83.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Memory safety bugs present in Firefox 133, Thunderbird 133, Firefox ESR 128.5, and Thunderbird 128.5. 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 134, Firefox ESR 128.6, Thunderbird 134, and Thunderbird 128.6.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | firefox | 128.6.0-1.el8_10 | ALSA-2025:0144 |
| AlmaLinux:9 | firefox | 128.6.0-1.el9_5 | ALSA-2025:0080 |
| AlmaLinux:9 | firefox-x11 | 128.6.0-1.el9_5 | ALSA-2025:0080 |
| AlmaLinux:8 | thunderbird | 128.6.0-3.el8_10.alma.1 | ALSA-2025:0281 |
| AlmaLinux:9 | thunderbird | 128.6.0-3.el9_5.alma.1 | ALSA-2025:0147 |
| Debian:12 | firefox-esr | 128.6.0esr-1~deb12u1 | DSA-5839-1 |
| Debian:12 | firefox-esr | 128.6.0esr-1~deb12u1 | DEBIAN-CVE-2025-0243 |
| Debian:13 | firefox-esr | 128.6.0esr-1 | DEBIAN-CVE-2025-0243 |
| Debian:14 | firefox-esr | 128.6.0esr-1 | DEBIAN-CVE-2025-0243 |
| Debian:12 | thunderbird | 1:128.6.0esr-1~deb12u1 | DEBIAN-CVE-2025-0243 |
| Debian:12 | thunderbird | 1:128.6.0esr-1~deb12u1 | DSA-5841-1 |
| Debian:13 | thunderbird | 1:128.6.0esr-1 | DEBIAN-CVE-2025-0243 |
| Debian:14 | thunderbird | 1:128.6.0esr-1 | DEBIAN-CVE-2025-0243 |
| Rocky Linux:8 | firefox | 0:128.6.0-1.el8_10 | RLSA-2025:0144 |
| Rocky Linux:8 | thunderbird | 0:128.6.0-3.el8_10 | RLSA-2025:0281 |
| Ubuntu:22.04:LTS | mozjs102 | no fix listed | UBUNTU-CVE-2025-0243 |
| Ubuntu:24.04:LTS | mozjs102 | no fix listed | UBUNTU-CVE-2025-0243 |
| Ubuntu:24.04:LTS | mozjs115 | no fix listed | UBUNTU-CVE-2025-0243 |
| Ubuntu:22.04:LTS | mozjs78 | no fix listed | UBUNTU-CVE-2025-0243 |
| Ubuntu:22.04:LTS | mozjs91 | no fix listed | UBUNTU-CVE-2025-0243 |
| Ubuntu:22.04:LTS | thunderbird | 1:140.7.1+build1-0ubuntu0.22.04.1 | UBUNTU-CVE-2025-0243 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | see references |
| Mozilla | Thunderbird | see references |
References
- Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 128.6, and Thunderbird 128.6
- https://www.mozilla.org/security/advisories/mfsa2025-01/
- https://www.mozilla.org/security/advisories/mfsa2025-02/
- https://www.mozilla.org/security/advisories/mfsa2025-04/
- https://www.mozilla.org/security/advisories/mfsa2025-05/
- https://lists.debian.org/debian-lts-announce/2025/01/msg00004.html