Vulnerability Details : CVE-2025-4093
Memory safety bug present in Firefox ESR 128.9, and Thunderbird 128.9. 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 affects Firefox ESR < 128.10 and Thunderbird < 128.10.
Vulnerability category: Memory Corruption
Products affected by CVE-2025-4093
- cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2025-4093
0.05%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 16 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2025-4093
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
6.5
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |
3.9
|
2.5
|
134c704f-9b21-4f2e-91b3-4a467353bcc0 | 2025-04-29 |
CWE ids for CVE-2025-4093
-
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.Assigned by: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)
References for CVE-2025-4093
-
https://bugzilla.mozilla.org/show_bug.cgi?id=1894100
Access DeniedPermissions Required
-
https://www.mozilla.org/security/advisories/mfsa2025-29/
Security Vulnerabilities fixed in Firefox ESR 128.10 — MozillaVendor Advisory
-
https://www.mozilla.org/security/advisories/mfsa2025-32/
Security Vulnerabilities fixed in Thunderbird ESR 128.10 — MozillaVendor Advisory
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