Vulnerability Details : CVE-2025-1020
Memory safety bugs present in Firefox 134 and Thunderbird 134. 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 < 135 and Thunderbird < 135.
Vulnerability category: Memory Corruption
Products affected by CVE-2025-1020
- cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2025-1020
0.07%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 33 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2025-1020
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
9.8
|
CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
3.9
|
5.9
|
134c704f-9b21-4f2e-91b3-4a467353bcc0 | 2025-02-06 |
|
9.8
|
CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
3.9
|
5.9
|
NIST | 2025-02-06 |
CWE ids for CVE-2025-1020
-
The product writes data past the end, or before the beginning, of the intended buffer.Assigned by:
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)
- nvd@nist.gov (Primary)
References for CVE-2025-1020
-
https://www.mozilla.org/security/advisories/mfsa2025-07/
Security Vulnerabilities fixed in Firefox 135 — MozillaVendor Advisory
-
https://www.mozilla.org/security/advisories/mfsa2025-11/
Vendor Advisory
-
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1939063%2C1942169
Broken Link
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