Home/CVE/After selecting a malicious Windows `.url` shortcut from the local filesystem, an unexpected file could be uploaded. *
CVE

CVE-2025-3033

After selecting a malicious Windows `.url` shortcut from the local filesystem, an unexpected file could be uploaded. *

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.

HIGH · CVSS 7.7 EPSS 0.00067
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules1 YARA rules0
⬡

Weakness Classification

CWE-73External Control of File Name or Path
▤

Affected Products & Versions

2
mozilla firefox< 137.0
mozilla thunderbird< 137.0
◈

Sigma Hunt Rules

1
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
producthighSQLite Firefox Profile Data DB Access
▣

Scoring & Timeline

7.7
HIGH · CVSS v3.1 · security@mozilla.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD01 Apr 2025 · 01:15 PM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

2
suse-csafopenSUSE-SU-2025:14971-1
mozilla-mfsaMFSA2025-20
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://bugzilla.mozilla.org/show_bug.cgi?id=1950056Issue TrackingPermissions Required
https://www.mozilla.org/security/advisories/mfsa2025-20/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-23/Vendor Advisory
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