CVE-2025-8033
published 2025-07-22CVE-2025-8033: 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…
PriorityP430medium6.5CVSS 3.1
AVNACLPRNUIRSUCHINAN
EPSS
0.35%
27.4th percentile
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
15 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | firefox | < firefox 141.0-1 (sid) | firefox 141.0-1 (sid) |
| debian | firefox-esr | < firefox 141.0-1 (sid) | firefox 141.0-1 (sid) |
| debian | thunderbird | < firefox 141.0-1 (sid) | firefox 141.0-1 (sid) |
| mozilla | firefox | < 115.26.0 | 115.26.0 |
| mozilla | firefox | < 141.0 | 141.0 |
| mozilla | firefox | — | — |
| mozilla | firefox | >= 128.0 < 128.13.0 | 128.13.0 |
| mozilla | firefox | >= 140.0 < 140.1.0 | 140.1.0 |
| mozilla | thunderbird | < 128.13.0 | 128.13.0 |
| mozilla | thunderbird | < 141.0 | 141.0 |
| mozilla | thunderbird | >= 0 < 1:128.13.0esr-1~deb11u1 | 1:128.13.0esr-1~deb11u1 |
| mozilla | thunderbird | >= 0 < 1:128.13.0esr-1~deb12u1 | 1:128.13.0esr-1~deb12u1 |
| mozilla | thunderbird | >= 0 < 1:128.13.0esr-1 | 1:128.13.0esr-1 |
| mozilla | thunderbird | >= 0 < 1:128.13.0esr-1 | 1:128.13.0esr-1 |
| mozilla | thunderbird | >= 140.0 < 140.1.0 | 140.1.0 |
CVSS provenance
nvdv3.16.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
osv6.5MEDIUM
vendor_debian6.5MEDIUM
vendor_redhat6.5MEDIUM
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Ubuntu
Thunderbird vulnerabilities
vendor_ubuntu·2026-02-02
CVE-2025-8031 Thunderbird vulnerabilities
Title: Thunderbird vulnerabilities
Summary: Several security issues were fixed in Thunderbird.
Multiple security issues were discovered in Thunderbird. If a user were
tricked into opening a specially crafted website in a browsing context,
an attacker could potentially exploit these to cause a denial of service,
obtain sensitive information, bypass security restrictions, cross-site
tracing, or execute arbitrary code.
Instructions: In general, a standard system update will make all the necessary changes.
Red Hat
firefox: thunderbird: Incorrect JavaScript state machine for generators
vendor_redhat·2025-07-22·CVSS 6.5
CVE-2025-8033 [MEDIUM] CWE-476 firefox: thunderbird: Incorrect JavaScript state machine for generators
firefox: thunderbird: Incorrect JavaScript state machine for generators
The JavaScript engine did not handle closed generators correctly and it was possible to resume them leading to a nullptr deref. This vulnerability affects Firefox < 141, Firefox ESR < 115.26, Firefox ESR < 128.13, Firefox ESR < 140.1, Thunderbird < 141, Thunderbird < 128.13, and Thunderbird < 140.1.
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
The JavaScript engine did not handle closed generators correctly, and it was possible to resume them, resulting in a nullptr dereference.
Statement: Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
Package: rhel10/firefox-flatpak (Red Ha
Debian
CVE-2025-8033: firefox - The JavaScript engine did not handle closed generators correctly and it was poss...
vendor_debian·2025·CVSS 6.5
CVE-2025-8033 [MEDIUM] CVE-2025-8033: firefox - The JavaScript engine did not handle closed generators correctly and it was poss...
The JavaScript engine did not handle closed generators correctly and it was possible to resume them leading to a nullptr deref. This vulnerability affects Firefox < 141, Firefox ESR < 115.26, Firefox ESR < 128.13, Firefox ESR < 140.1, Thunderbird < 141, Thunderbird < 128.13, and Thunderbird < 140.1.
Scope: local
sid: resolved (fixed in 141.0-1)
Mozilla
Mozilla Foundation Security Advisory 2025-59: CVE-2025-8033
vendor_mozilla·CVSS 6.5
CVE-2025-8033 [MEDIUM] Mozilla Foundation Security Advisory 2025-59: CVE-2025-8033
Mozilla Foundation Security Advisory 2025-59
CVE: CVE-2025-8033
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 140.1
Mozilla
Mozilla Foundation Security Advisory 2025-61: CVE-2025-8033
vendor_mozilla·CVSS 6.5
CVE-2025-8033 [MEDIUM] Mozilla Foundation Security Advisory 2025-61: CVE-2025-8033
Mozilla Foundation Security Advisory 2025-61
CVE: CVE-2025-8033
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 141
Mozilla
Mozilla Foundation Security Advisory 2025-63: CVE-2025-8033
vendor_mozilla·CVSS 6.5
CVE-2025-8033 [MEDIUM] Mozilla Foundation Security Advisory 2025-63: CVE-2025-8033
Mozilla Foundation Security Advisory 2025-63
CVE: CVE-2025-8033
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 140.1
Mozilla
Mozilla Foundation Security Advisory 2025-58: CVE-2025-8033
vendor_mozilla·CVSS 6.5
CVE-2025-8033 [MEDIUM] Mozilla Foundation Security Advisory 2025-58: CVE-2025-8033
Mozilla Foundation Security Advisory 2025-58
CVE: CVE-2025-8033
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 128.13
Mozilla
Mozilla Foundation Security Advisory 2025-57: CVE-2025-8033
vendor_mozilla·CVSS 6.5
CVE-2025-8033 [MEDIUM] Mozilla Foundation Security Advisory 2025-57: CVE-2025-8033
Mozilla Foundation Security Advisory 2025-57
CVE: CVE-2025-8033
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 115.26
Mozilla
Mozilla Foundation Security Advisory 2025-62: CVE-2025-8033
vendor_mozilla·CVSS 6.5
CVE-2025-8033 [MEDIUM] Mozilla Foundation Security Advisory 2025-62: CVE-2025-8033
Mozilla Foundation Security Advisory 2025-62
CVE: CVE-2025-8033
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 128.13
Mozilla
Mozilla Foundation Security Advisory 2025-56: CVE-2025-8033
vendor_mozilla·CVSS 6.5
CVE-2025-8033 [MEDIUM] Mozilla Foundation Security Advisory 2025-56: CVE-2025-8033
Mozilla Foundation Security Advisory 2025-56
CVE: CVE-2025-8033
Product: Firefox
Impact: high
Fixed in: Firefox 141
GHSA
GHSA-j6gx-vvh5-9mwh: The JavaScript engine did not handle closed generators correctly and it was possible to resume them leading to a nullptr deref
ghsa_unreviewed·2025-07-22
CVE-2025-8033 [MEDIUM] CWE-476 GHSA-j6gx-vvh5-9mwh: The JavaScript engine did not handle closed generators correctly and it was possible to resume them leading to a nullptr deref
The JavaScript engine did not handle closed generators correctly and it was possible to resume them leading to a nullptr deref. This vulnerability affects Firefox < 141, Firefox ESR < 115.26, Firefox ESR < 128.13, Firefox ESR < 140.1, Thunderbird < 141, Thunderbird < 128.13, and Thunderbird < 140.1.
OSV
CVE-2025-8033: The JavaScript engine did not handle closed generators correctly and it was possible to resume them leading to a nullptr deref
osv·2025-07-22·CVSS 6.5
CVE-2025-8033 [MEDIUM] CVE-2025-8033: The JavaScript engine did not handle closed generators correctly and it was possible to resume them leading to a nullptr deref
The JavaScript engine did not handle closed generators correctly and it was possible to resume them leading to a nullptr deref. This vulnerability affects Firefox < 141, Firefox ESR < 115.26, Firefox ESR < 128.13, Firefox ESR < 140.1, Thunderbird < 141, Thunderbird < 128.13, and Thunderbird < 140.1.
No detection rules found.
No public exploits indexed.
https://bugzilla.mozilla.org/show_bug.cgi?id=1973990https://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
2025-07-22
Published