CVE-2025-4092 — Improper Restriction of Operations within the Bounds of a Memory Buffer in Mozilla Firefox

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory BufferCWE-120 — Classic Buffer Overflow9 documents8 sources
Severity
6.5MEDIUMNVD
EPSS
0.3%
top 48.39%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Mozilla FirefoxMozilla Thunderbird
Timeline
PublishedApr 29
Latest updateFeb 2

Description

Memory safety bugs present in Firefox 137 and Thunderbird 137. 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 138 and Thunderbird 138.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:NExploitability: 3.9 | Impact: 2.5

Affected Packages3 packages

▶NVDmozilla/firefox< 138.0
▶NVDmozilla/thunderbird< 138.0
▶Ubuntumozilla/thunderbird< 1:140.7.1+build1-0ubuntu0.22.04.1

🔴Vulnerability Details

3
CVEList
Memory safety bugs fixed in Firefox 138 and Thunderbird 138↗2025-04-29
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OSV
CVE-2025-4092: Memory safety bugs present in Firefox 137 and Thunderbird 137↗2025-04-29
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GHSA
GHSA-jv2r-997x-hv7m: Memory safety bugs present in Firefox 137 and Thunderbird 137↗2025-04-29
▶

📋Vendor Advisories

5
Ubuntu
Thunderbird vulnerabilities↗2026-02-02
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Red Hat
firefox: thunderbird: Memory safety bugs fixed in Firefox 138 and Thunderbird 138↗2025-04-29
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Debian
CVE-2025-4092: firefox - Memory safety bugs present in Firefox 137 and Thunderbird 137. Some of these bug...↗2025
▶
Mozilla
Mozilla Foundation Security Advisory 2025-28: CVE-2025-4092↗
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Mozilla
Mozilla Foundation Security Advisory 2025-31: CVE-2025-4092↗
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CVE-2025-4092 — Mozilla Firefox vulnerability | cvebase