🔐 CVE Alert

CVE-2025-4092

MEDIUM 6.5

Memory safety bugs fixed in Firefox 138 and Thunderbird 138

CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th

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.

Vendor mozilla
Product firefox
Ecosystems
Industries
Technology
Published Apr 29, 2025
Last Updated Apr 13, 2026
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Affected Versions

Mozilla / Firefox
All versions affected
Mozilla / Thunderbird
All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗
bugzilla.mozilla.org: https://bugzilla.mozilla.org/buglist.cgi?bug_id=1924108%2C1950780%2C1959367 mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-28/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-31/

Credits

Randell Jesup, Jens Stutte, and the Mozilla Fuzzing Team