Vulnerability · Published Jul 22, 2025 · Assigned by mozilla
CVE-2025-8033Incorrect JavaScript state machine for generators
Medium 6.5
In plain English
A medium-severity null pointer dereference 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 0.4% (higher than 38% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.4%top 62.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
The JavaScript engine did not handle closed generators correctly and it was possible to resume them leading to a nullptr deref. This vulnerability was fixed in Firefox 141, Firefox ESR 115.26, Firefox ESR 128.13, Firefox ESR 140.1, Thunderbird 141, Thunderbird 128.13, and Thunderbird 140.1.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | firefox | 128.13.0-1.el10_0 | ALSA-2025:11797 |
| AlmaLinux:8 | firefox | 128.13.0-1.el8_10.alma.1 | ALSA-2025:11747 |
| AlmaLinux:9 | firefox | 128.13.0-1.el9_6.alma.1 | ALSA-2025:11748 |
| AlmaLinux:9 | firefox-x11 | 128.13.0-1.el9_6.alma.1 | ALSA-2025:11748 |
| AlmaLinux:10 | thunderbird | 128.13.0-3.el10_0.alma.1 | ALSA-2025:12188 |
| AlmaLinux:8 | thunderbird | 128.13.0-3.el8_10.alma.1 | ALSA-2025:13676 |
| AlmaLinux:9 | thunderbird | 128.13.0-3.el9_6.alma.1 | ALSA-2025:12187 |
| Debian:12 | firefox-esr | 128.13.0esr-1~deb12u1 | DEBIAN-CVE-2025-8033 |
| Debian:12 | firefox-esr | 128.13.0esr-1~deb12u1 | DSA-5964-1 |
| Debian:13 | firefox-esr | 128.13.0esr-1 | DEBIAN-CVE-2025-8033 |
| Debian:14 | firefox-esr | 128.13.0esr-1 | DEBIAN-CVE-2025-8033 |
| Debian:12 | thunderbird | 1:128.13.0esr-1~deb12u1 | DSA-5966-1 |
| Debian:12 | thunderbird | 1:128.13.0esr-1~deb12u1 | DEBIAN-CVE-2025-8033 |
| Debian:13 | thunderbird | 1:128.13.0esr-1 | DEBIAN-CVE-2025-8033 |
| Debian:14 | thunderbird | 1:128.13.0esr-1 | DEBIAN-CVE-2025-8033 |
| Rocky Linux:10 | firefox | 0:128.13.0-1.el10_0 | RLSA-2025:11797 |
| Rocky Linux:8 | firefox | 0:128.13.0-1.el8_10 | RLSA-2025:11747 |
| Rocky Linux:9 | firefox | 0:128.13.0-1.el9_6 | RLSA-2025:11748 |
| Rocky Linux:10 | thunderbird | 0:128.13.0-3.el10_0 | RLSA-2025:12188 |
| Rocky Linux:8 | thunderbird | 0:128.13.0-3.el8_10 | RLSA-2025:13676 |
| Rocky Linux:9 | thunderbird | 0:128.13.0-3.el9_6 | RLSA-2025:12187 |
| Ubuntu:22.04:LTS | mozjs102 | no fix listed | UBUNTU-CVE-2025-8033 |
| Ubuntu:24.04:LTS | mozjs102 | no fix listed | UBUNTU-CVE-2025-8033 |
| Ubuntu:24.04:LTS | mozjs115 | no fix listed | UBUNTU-CVE-2025-8033 |
| Ubuntu:22.04:LTS | mozjs78 | no fix listed | UBUNTU-CVE-2025-8033 |
| Ubuntu:22.04:LTS | mozjs91 | no fix listed | UBUNTU-CVE-2025-8033 |
| Ubuntu:22.04:LTS | thunderbird | 1:140.7.1+build1-0ubuntu0.22.04.1 | UBUNTU-CVE-2025-8033 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | see references |
| Mozilla | Thunderbird | see references |
Weakness: CWE-476 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1973990
- https://www.mozilla.org/security/advisories/mfsa2025-56/
- https://www.mozilla.org/security/advisories/mfsa2025-57/
- https://www.mozilla.org/security/advisories/mfsa2025-58/
- https://www.mozilla.org/security/advisories/mfsa2025-59/
- https://www.mozilla.org/security/advisories/mfsa2025-61/
- https://www.mozilla.org/security/advisories/mfsa2025-62/
- https://www.mozilla.org/security/advisories/mfsa2025-63/
- https://lists.debian.org/debian-lts-announce/2025/07/msg00016.html