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CVE-2025-5268: Memory safety bugs present in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10. Some of these bugs showed evidence of...
6.5
CVSS
Description
Memory safety bugs present in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10. 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 affects Firefox < 139 and Firefox ESR < 128.11.
Classification
CVE ID: CVE-2025-5268
CVSS Base Severity: MEDIUM
CVSS Base Score: 6.5
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Problem Types
Memory safety bugs fixed in Firefox 139, Thunderbird 139, Firefox ESR 128.11, and Thunderbird 128.11Affected Products
Vendor: Mozilla
Product: Firefox, Firefox ESR
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.08% (probability of being exploited)
EPSS Percentile: 24.17% (scored less or equal to compared to others)
EPSS Date: 2025-06-18 (when was this score calculated)
References
https://nvd.nist.gov/vuln/detail/CVE-2025-5268https://bugzilla.mozilla.org/buglist.cgi?bug_id=1950136%2C1958121%2C1960499%2C1962634
https://www.mozilla.org/security/advisories/mfsa2025-42/
https://www.mozilla.org/security/advisories/mfsa2025-44/