BaseFortify

Publication date: 2025-12-09

Last updated on: 2026-04-13

Assigner: Mozilla Corporation

Description

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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2025-12-09

Last Modified

2026-04-13

Generated

2026-07-06

AI Q&A

2025-12-09

EPSS Evaluated

2026-07-05

NVD

CVE-2025-14333

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	thunderbird_esr	140.5
mozilla	thunderbird	145
mozilla	firefox_esr	140.5
mozilla	firefox	145
mozilla	firefox	to 146.0 (inc)
mozilla	thunderbird	to 146.0 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-787	The product writes data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Executive Summary

This vulnerability involves memory safety bugs in certain versions of Firefox and Thunderbird (specifically Firefox ESR 140.5, Thunderbird ESR 140.5, Firefox 145, and Thunderbird 145). These bugs can cause memory corruption, which could potentially be exploited by attackers to execute arbitrary code on affected systems.

Impact Analysis

If exploited, this vulnerability could allow an attacker to run arbitrary code on your system without your permission, potentially leading to unauthorized access, data theft, or system compromise.

Mitigation Strategies

To mitigate this vulnerability, update Firefox to version 146 or later, and Firefox ESR to version 140.6 or later. Similarly, update Thunderbird and Thunderbird ESR to their latest versions to ensure the memory safety bugs are fixed.

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