Vulnerability · Published Feb 4, 2025 · Assigned by mozilla
CVE-2025-1012Use-after-free during concurrent delazification
Critical 9.8
In plain English
A critical-severity use-after-free 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 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.5%top 60.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
A race during concurrent delazification could have led to a use-after-free. This vulnerability was fixed in Firefox 135, Firefox ESR 115.20, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | firefox | 128.7.0-1.el8_10 | ALSA-2025:1283 |
| AlmaLinux:9 | firefox | 128.7.0-1.el9_5 | ALSA-2025:1066 |
| AlmaLinux:9 | firefox-x11 | 128.7.0-1.el9_5 | ALSA-2025:1066 |
| AlmaLinux:8 | thunderbird | 128.7.0-1.el8_10.alma.1 | ALSA-2025:1292 |
| AlmaLinux:9 | thunderbird | 128.7.0-1.el9_5.alma.1 | ALSA-2025:1184 |
| Debian:12 | firefox-esr | 128.7.0esr-1~deb12u1 | DEBIAN-CVE-2025-1012 |
| Debian:12 | firefox-esr | 128.7.0esr-1~deb12u1 | DSA-5858-1 |
| Debian:13 | firefox-esr | 128.7.0esr-1 | DEBIAN-CVE-2025-1012 |
| Debian:14 | firefox-esr | 128.7.0esr-1 | DEBIAN-CVE-2025-1012 |
| Debian:12 | thunderbird | 1:128.7.0esr-1~deb12u1 | DEBIAN-CVE-2025-1012 |
| Debian:12 | thunderbird | 1:128.7.0esr-1~deb12u1 | DSA-5861-1 |
| Debian:13 | thunderbird | 1:128.7.0esr-1 | DEBIAN-CVE-2025-1012 |
| Debian:14 | thunderbird | 1:128.7.0esr-1 | DEBIAN-CVE-2025-1012 |
| Rocky Linux:8 | firefox | 0:128.7.0-1.el8_10 | RLSA-2025:1283 |
| Rocky Linux:8 | thunderbird | 0:128.7.0-1.el8_10 | RLSA-2025:1292 |
| Ubuntu:22.04:LTS | mozjs102 | no fix listed | UBUNTU-CVE-2025-1012 |
| Ubuntu:24.04:LTS | mozjs102 | no fix listed | UBUNTU-CVE-2025-1012 |
| Ubuntu:24.04:LTS | mozjs115 | no fix listed | UBUNTU-CVE-2025-1012 |
| Ubuntu:22.04:LTS | mozjs78 | no fix listed | UBUNTU-CVE-2025-1012 |
| Ubuntu:22.04:LTS | mozjs91 | no fix listed | UBUNTU-CVE-2025-1012 |
| Ubuntu:22.04:LTS | thunderbird | 1:128.12.0+build1-0ubuntu0.22.04.1 | UBUNTU-CVE-2025-1012 |
| 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-416 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1939710
- https://www.mozilla.org/security/advisories/mfsa2025-07/
- https://www.mozilla.org/security/advisories/mfsa2025-08/
- https://www.mozilla.org/security/advisories/mfsa2025-09/
- https://www.mozilla.org/security/advisories/mfsa2025-10/
- https://www.mozilla.org/security/advisories/mfsa2025-11/
- https://lists.debian.org/debian-lts-announce/2025/02/msg00006.html
- https://lists.debian.org/debian-lts-announce/2025/02/msg00005.html