CVE-2025-14333
published 2025-12-09CVE-2025-14333: Memory safety bugs present in Firefox ESR 140.5, Thunderbird ESR 140.5, Firefox 145 and Thunderbird 145. Some of these bugs showed evidence of memory…
PriorityP349high8.1CVSS 3.1
AVNACHPRNUINSUCHIHAH
EPSS
0.38%
30.9th percentile
Memory safety bugs present in Firefox ESR 140.5, Thunderbird ESR 140.5, Firefox 145 and Thunderbird 145. 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 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
nvdv3.18.1HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
osv8.1HIGH
vendor_debian8.1HIGH
vendor_redhat8.1HIGH
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Red Hat
firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.6, Thunderbird ESR 140.6, Firefox 146 and Thunderbird 146
vendor_redhat·2025-12-09·CVSS 8.1
CVE-2025-14333 [HIGH] firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.6, Thunderbird ESR 140.6, Firefox 146 and Thunderbird 146
firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.6, Thunderbird ESR 140.6, Firefox 146 and Thunderbird 146
Memory safety bugs present in Firefox ESR 140.5, Thunderbird ESR 140.5, Firefox 145 and Thunderbird 145. 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 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:
Memory safety bugs. 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.
Statem
Debian
CVE-2025-14333: firefox - Memory safety bugs present in Firefox ESR 140.5, Thunderbird ESR 140.5, Firefox ...
vendor_debian·2025·CVSS 8.1
CVE-2025-14333 [HIGH] CVE-2025-14333: firefox - Memory safety bugs present in Firefox ESR 140.5, Thunderbird ESR 140.5, Firefox ...
Memory safety bugs present in Firefox ESR 140.5, Thunderbird ESR 140.5, Firefox 145 and Thunderbird 145. 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 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 2025-96: CVE-2025-14333
vendor_mozilla·CVSS 8.1
CVE-2025-14333 [HIGH] Mozilla Foundation Security Advisory 2025-96: CVE-2025-14333
Mozilla Foundation Security Advisory 2025-96
CVE: CVE-2025-14333
Product: Thunderbird
Impact: moderate
Fixed in: Thunderbird 140.6
Mozilla
Mozilla Foundation Security Advisory 2025-95: CVE-2025-14333
vendor_mozilla·CVSS 8.1
CVE-2025-14333 [HIGH] Mozilla Foundation Security Advisory 2025-95: CVE-2025-14333
Mozilla Foundation Security Advisory 2025-95
CVE: CVE-2025-14333
Product: Thunderbird
Impact: moderate
Fixed in: Thunderbird 146
Mozilla
Mozilla Foundation Security Advisory 2025-94: CVE-2025-14333
vendor_mozilla·CVSS 8.1
CVE-2025-14333 [HIGH] Mozilla Foundation Security Advisory 2025-94: CVE-2025-14333
Mozilla Foundation Security Advisory 2025-94
CVE: CVE-2025-14333
Product: Firefox ESR
Impact: moderate
Fixed in: Firefox ESR 140.6
Mozilla
Mozilla Foundation Security Advisory 2025-92: CVE-2025-14333
vendor_mozilla·CVSS 8.1
CVE-2025-14333 [HIGH] Mozilla Foundation Security Advisory 2025-92: CVE-2025-14333
Mozilla Foundation Security Advisory 2025-92
CVE: CVE-2025-14333
Product: Firefox
Impact: moderate
Fixed in: Firefox 146
OSV
CVE-2025-14333: Memory safety bugs present in Firefox ESR 140
osv·2025-12-09·CVSS 8.1
CVE-2025-14333 [HIGH] CVE-2025-14333: Memory safety bugs present in Firefox ESR 140
Memory safety bugs present in Firefox ESR 140.5, Thunderbird ESR 140.5, Firefox 145 and Thunderbird 145. 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 affects Firefox < 146, Firefox ESR < 140.6, Thunderbird < 146, and Thunderbird < 140.6.
GHSA
GHSA-4mm6-6c2q-x3fp: Memory safety bugs present in Firefox ESR 140
ghsa_unreviewed·2025-12-09
CVE-2025-14333 [HIGH] CWE-119 GHSA-4mm6-6c2q-x3fp: Memory safety bugs present in Firefox ESR 140
Memory safety bugs present in Firefox ESR 140.5, Thunderbird ESR 140.5, Firefox 145 and Thunderbird 145. 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 affects Firefox < 146 and Firefox ESR < 140.6.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2025-14333 firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.6, Thunderbird ESR 140.6, Firefox 146 and Thunderbird 146
bugzilla·2025-12-09·CVSS 8.1
CVE-2025-14333 [HIGH] CVE-2025-14333 firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.6, Thunderbird ESR 140.6, Firefox 146 and Thunderbird 146
CVE-2025-14333 firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.6, Thunderbird ESR 140.6, Firefox 146 and Thunderbird 146
Memory safety bugs present in Firefox ESR 140.5, Thunderbird ESR 140.5, Firefox 145 and Thunderbird 145. 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 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
Wiz
CVE-2025-14333 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 8.1
CVE-2025-14333 [HIGH] CVE-2025-14333 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2025-14333 :
NixOS vulnerability analysis and mitigation
Memory safety bugs present in Firefox ESR 140.5, Thunderbird ESR 140.5, Firefox 145 and Thunderbird 145. 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 affects Firefox < 146, Firefox ESR < 140.6, Thunderbird < 146, and Thunderbird < 140.6.
Source : NVD
## 8.1
Score
Published December 9, 2025
Severity HIGH
CNA Score 8.1
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) 20.6
Exploitation Probability (EPSS) 0.1
Affected packages and libraries
MozillaFir
2025-12-09
Published