CVE-2025-14329
published 2025-12-09CVE-2025-14329: Privilege escalation in the Netmonitor component. This vulnerability was fixed in Firefox 146, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.
PriorityP347high8.8CVSS 3.1
AVNACLPRNUIRSUCHIHAH
EPSS
0.34%
26.5th percentile
Privilege escalation in the Netmonitor component. This vulnerability was fixed in Firefox 146, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.
Affected
12 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | firefox | < firefox 146.0-1 (sid) | firefox 146.0-1 (sid) |
| debian | firefox-esr | < firefox 146.0-1 (sid) | firefox 146.0-1 (sid) |
| debian | thunderbird | < firefox 146.0-1 (sid) | firefox 146.0-1 (sid) |
| mozilla | firefox | < 140.6.0 | 140.6.0 |
| mozilla | firefox | < 146.0 | 146.0 |
| mozilla | firefox | — | — |
| mozilla | thunderbird | < 140.6.0 | 140.6.0 |
| mozilla | thunderbird | < 146.0 | 146.0 |
| mozilla | thunderbird | >= 0 < 1:140.6.0esr-1~deb11u1 | 1:140.6.0esr-1~deb11u1 |
| mozilla | thunderbird | >= 0 < 1:140.6.0esr-1~deb12u1 | 1:140.6.0esr-1~deb12u1 |
| mozilla | thunderbird | >= 0 < 1:140.6.0esr-1~deb13u1 | 1:140.6.0esr-1~deb13u1 |
| mozilla | thunderbird | >= 0 < 1:140.6.0esr-1 | 1:140.6.0esr-1 |
CVSS provenance
nvdv3.18.8HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
osv8.8HIGH
vendor_debian8.8HIGH
vendor_redhat8.8HIGH
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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: Privilege escalation in the Netmonitor component
vendor_redhat·2025-12-09·CVSS 8.8
CVE-2025-14329 [HIGH] firefox: thunderbird: Privilege escalation in the Netmonitor component
firefox: thunderbird: Privilege escalation in the Netmonitor component
Privilege escalation in the Netmonitor component. This vulnerability affects Firefox < 146, Firefox ESR < 140.6, Thunderbird < 146, and Thunderbird < 140.6.
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Privilege escalation in the Netmonitor component.
Statement: Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
Package: rhel10/firefox-flatpak (Red Hat Enterprise Linux 10) - Affected
Package: rhel10/thunderbird-flatpak (Red Hat Enterprise Linux 10) - Affected
Package: firefox (Red Hat Enterprise Linux 6) - Out of support scope
Package: thunderbird (Red Hat Enterprise Linux 6)
Debian
CVE-2025-14329: firefox - Privilege escalation in the Netmonitor component. This vulnerability affects Fir...
vendor_debian·2025·CVSS 8.8
CVE-2025-14329 [HIGH] CVE-2025-14329: firefox - Privilege escalation in the Netmonitor component. This vulnerability affects Fir...
Privilege escalation in the Netmonitor component. This vulnerability affects Firefox < 146, Firefox ESR < 140.6, Thunderbird < 146, and Thunderbird < 140.6.
Scope: local
sid: resolved (fixed in 146.0-1)
Mozilla
Mozilla Foundation Security Advisory 2025-92: CVE-2025-14329
vendor_mozilla·CVSS 8.8
CVE-2025-14329 [HIGH] Mozilla Foundation Security Advisory 2025-92: CVE-2025-14329
Mozilla Foundation Security Advisory 2025-92
CVE: CVE-2025-14329
Product: Firefox
Impact: moderate
Fixed in: Firefox 146
Mozilla
Mozilla Foundation Security Advisory 2025-94: CVE-2025-14329
vendor_mozilla·CVSS 8.8
CVE-2025-14329 [HIGH] Mozilla Foundation Security Advisory 2025-94: CVE-2025-14329
Mozilla Foundation Security Advisory 2025-94
CVE: CVE-2025-14329
Product: Firefox ESR
Impact: moderate
Fixed in: Firefox ESR 140.6
Mozilla
Mozilla Foundation Security Advisory 2025-95: CVE-2025-14329
vendor_mozilla·CVSS 8.8
CVE-2025-14329 [HIGH] Mozilla Foundation Security Advisory 2025-95: CVE-2025-14329
Mozilla Foundation Security Advisory 2025-95
CVE: CVE-2025-14329
Product: Thunderbird
Impact: moderate
Fixed in: Thunderbird 146
Mozilla
Mozilla Foundation Security Advisory 2025-96: CVE-2025-14329
vendor_mozilla·CVSS 8.8
CVE-2025-14329 [HIGH] Mozilla Foundation Security Advisory 2025-96: CVE-2025-14329
Mozilla Foundation Security Advisory 2025-96
CVE: CVE-2025-14329
Product: Thunderbird
Impact: moderate
Fixed in: Thunderbird 140.6
OSV
CVE-2025-14329: Privilege escalation in the Netmonitor component
osv·2025-12-09·CVSS 8.8
CVE-2025-14329 [HIGH] CVE-2025-14329: Privilege escalation in the Netmonitor component
Privilege escalation in the Netmonitor component. This vulnerability affects Firefox < 146, Firefox ESR < 140.6, Thunderbird < 146, and Thunderbird < 140.6.
GHSA
GHSA-vxvx-cxrx-x52j: Privilege escalation in the Netmonitor component
ghsa_unreviewed·2025-12-09
CVE-2025-14329 [HIGH] GHSA-vxvx-cxrx-x52j: Privilege escalation in the Netmonitor component
Privilege escalation in the Netmonitor component. This vulnerability affects Firefox < 146 and Firefox ESR < 140.6.
No detection rules found.
No public exploits indexed.
Wiz
CVE-2025-14329 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 8.8
CVE-2025-14329 [HIGH] CVE-2025-14329 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2025-14329 :
NixOS vulnerability analysis and mitigation
Privilege escalation in the Netmonitor component. This vulnerability affects Firefox < 146, Firefox ESR < 140.6, Thunderbird < 146, and Thunderbird < 140.6.
Source : NVD
## 8.8
Score
Published December 9, 2025
Severity HIGH
CNA Score 8.8
Affected Technologies
NixOS
Mozilla Firefox
Has Public Exploit No
Has CISA KEV Exploit No
CISA KEV Release Date N/A
CISA KEV Due Date N/A
Exploitation Probability Percentile (EPSS) 16.3
Exploitation Probability (EPSS) 0.1
Affected packages and libraries
MozillaFirefox-translations-common
cpe:2.3:a:mozilla:firefox_esr
Sources
AlmaLinux 8 Severity HIGH Has Fix Added at: Dec 12, 2025
AlmaLinux 9 Severity HIGH Has Fix Added at: Dec 12, 2025
Debian 11, 12, 13, 14 Severity
Bugzilla
CVE-2025-14329 firefox: thunderbird: Privilege escalation in the Netmonitor component
bugzilla·2025-12-09·CVSS 8.8
CVE-2025-14329 [HIGH] CVE-2025-14329 firefox: thunderbird: Privilege escalation in the Netmonitor component
CVE-2025-14329 firefox: thunderbird: Privilege escalation in the Netmonitor component
Privilege escalation in the Netmonitor component. This vulnerability affects Firefox < 146 and Firefox ESR < 140.6.
Discussion:
This issue has been addressed in the following products:
Red Hat Enterprise Linux 10
Via RHSA-2025:23035 https://access.redhat.com/errata/RHSA-2025:23035
---
This issue has been addressed in the following products:
Red Hat Enterprise Linux 9
Via RHSA-2025:23034 https://access.redhat.com/errata/RHSA-2025:23034
---
This issue has been addressed in the following products:
Red Hat Enterprise Linux 8
Via RHSA-2025:23128 https://access.redhat.com/errata/RHSA-2025:23128
---
This issue has been addressed in the following products:
Red Hat Enterprise Linux 9
Via RHSA-2025
2025-12-09
Published