CVE-2025-0247

high-risk
Published 2025-01-07

Memory safety bugs present in Firefox 133 and Thunderbird 133. 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 134 and Thunderbird 134.

Do I need to act?

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15.1% chance of exploitation in next 30 days
EPSS score — higher than 85% of all CVEs
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
9
CVSS 9.8/10 Critical
NETWORK / LOW complexity

Affected Products (2)

Affected Vendors

Mozilla

References (3)

Broken Link https://bugzilla.mozilla.org/buglist.cgi?bug_id=1835193%2C1910021%2C1919803%2C19...
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2025-01/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2025-04/
51
/ 100
high-risk
Severity 32/34 · Critical
Exploitability 12/34 · Low
Exposure 7/34 · Low