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Usermin 0.980 through 1.x before 1.660 allows uconfig_save.cgi sig_file_free remote code execution because it uses the two argument (not three argument) form of Perl open.
Use CWE-96, Webmin vendor hub and Usermin product page to widen CVE-2015-2079 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2024-36453, CVE-2023-41162 and CVE-2023-41157 for nearby disclosures in the same product family.