Riskcovery

CVE-2025-6436

Memory safety bugs fixed in Firefox 140 and Thunderbird 140

State
Published
Severity
8.1 High
Published
Jun 24, 2025
Updated
Apr 13, 2026
Reserved
Jun 20, 2025

Read the record on cve.org

Description

Memory safety bugs present in Firefox 139 and Thunderbird 139. 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 140 and Thunderbird 140.

Scores

CVSSScoreVectorSource
3.18.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:HCISA-ADP

Weaknesses

  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

Affected Products

ProductVersions
FirefoxMozilla
  • 140 and laterNot affected
ThunderbirdMozilla
  • 140 and laterNot affected

References

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