CVE-2025-11721
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-10-14

Last updated on: 2026-04-13

Assigner: Mozilla Corporation

Description
Memory safety bug present in Firefox 143 and Thunderbird 143. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 144 and Thunderbird 144.
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Meta Information
Published
2025-10-14
Last Modified
2026-04-13
Generated
2026-06-16
AI Q&A
2025-10-14
EPSS Evaluated
2026-06-15
NVD
CVE-2025-11721
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
mozilla thunderbird to 140.0 (inc)
mozilla firefox From 60.9.0 (exc)
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-119 The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.
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Executive Summary

This vulnerability is a memory safety bug found in Firefox 143 and Thunderbird 143. It involves memory corruption, which means that the program may improperly handle memory, potentially allowing an attacker to exploit this flaw to run arbitrary code on the affected system. It affects versions of Firefox and Thunderbird earlier than 144.

Impact Analysis

If exploited, this vulnerability could allow an attacker to execute arbitrary code on your system, potentially leading to unauthorized access, data theft, or system compromise. This could affect the security and stability of your applications and data.

Mitigation Strategies

To mitigate this vulnerability, update Firefox and Thunderbird to version 144 or later, as the vulnerability affects versions prior to 144.

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