CVE-2025-1937
Published: 04 March 2025
Summary
CVE-2025-1937 is a high-severity Improper Handling of Overlap Between Protected Memory Ranges (CWE-1260) vulnerability in Mozilla Firefox. Its CVSS base score is 7.5 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Client Execution (T1203); ranked at the 49.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified are NIST 800-53 SC-39 (Process Isolation) and SI-16 (Memory Protection).
Deeper analysis
CVE-2025-1937 involves multiple memory safety bugs classified under CWE-1260, present in Firefox 135, Thunderbird 135, Firefox ESR 115.20, Firefox ESR 128.7, and Thunderbird 128.7. Some of these bugs demonstrated evidence of memory corruption, which Mozilla presumes could be exploited to achieve arbitrary code execution with sufficient effort. The vulnerability carries a CVSS v3.1 base score of 7.5.
Remote attackers can exploit CVE-2025-1937 over the network without privileges, though it requires high attack complexity and user interaction. Successful exploitation could result in high impacts to confidentiality, integrity, and availability, potentially enabling arbitrary code execution in the context of the affected browser or mail client.
Mozilla advisories MFSA2025-14, MFSA2025-15, MFSA2025-16, and MFSA2025-17 detail the fixes, which are available in Firefox 136, Firefox ESR 115.21, Firefox ESR 128.8, Thunderbird 136, and Thunderbird 128.8. Additional technical details are provided in Bugzilla entries for bugs 1938471 and 1940716. Security practitioners should prioritize updating affected instances to mitigate this issue.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-6082
Vulnerability details
Memory safety bugs present in Firefox 135, Thunderbird 135, Firefox ESR 115.20, Firefox ESR 128.7, and Thunderbird 128.7. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been…
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exploited to run arbitrary code. This vulnerability was fixed in Firefox 136, Firefox ESR 115.21, Firefox ESR 128.8, Thunderbird 136, and Thunderbird 128.8.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Memory corruption bugs enabling arbitrary code execution in client applications (browser/mail client) directly map to Exploitation for Client Execution.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires timely identification, reporting, and correction of software flaws like the memory safety bugs in CVE-2025-1937 to prevent arbitrary code execution.
Implements controls such as address space layout randomization and data execution prevention to minimize exploitation of memory corruption vulnerabilities in CVE-2025-1937.
Enforces process isolation in browsers like Firefox and Thunderbird to contain potential arbitrary code execution resulting from CVE-2025-1937 memory safety bugs.