CVE-2025-3033: firefox — Fix

Description

After selecting a malicious Windows `.url` shortcut from the local filesystem, an unexpected file could be uploaded. *This bug only affects Firefox on Windows. Other operating systems are unaffected.*. This vulnerability was fixed in Firefox 137 and Thunderbird 137.

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CVSS v3.1 Score

7.7

HIGH

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Weakness Type (CWE)

CWE-73 CWE-73

Affected Products

Vendor	Product	Versions
mozilla	firefox	< 137.0
mozilla	thunderbird	< 137.0

References

Advisories & Patches

https://www.mozilla.org/security/advisories/mfsa2025-20/ https://www.mozilla.org/security/advisories/mfsa2025-23/

Other References

https://bugzilla.mozilla.org/show_bug.cgi?id=1950056

Frequently Asked Questions

What is CVE-2025-3033? +

After selecting a malicious Windows `.url` shortcut from the local filesystem, an unexpected file could be uploaded. *This bug only affects Firefox on Windows. Other operating systems are unaffected.*. This vulnerability was fixed in Firefox 137 and Thunderbird 137. It has a CVSS v3.1 base score of 7.7 (HIGH).

How severe is CVE-2025-3033? +

CVE-2025-3033 has a CVSS v3.1 score of 7.7 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-3033? +

CVE-2025-3033 affects products from mozilla, specifically: firefox, thunderbird. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-3033? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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