{"id":"CVE-2025-8760","aliases":["EUVD-2025-24545","GHSA-4jm8-qw96-rm2j"],"status":"published","title":"INSTAR 2K+/4K fcgi_server base64_decode buffer overflow","description":"A vulnerability was identified in INSTAR 2K+ and 4K 3.11.1 Build 1124. This affects the function base64_decode of the component fcgi_server. The manipulation of the argument Authorization leads to buffer overflow. It is possible to initiate the attack remotely.","severity":{"version":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00874,"percentile":0.59191,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-119","CWE-120"],"published":"2025-08-13T06:14:02Z","modified":"2026-06-17T10:07:34Z","exploits":[{"source":"pocgithub","id":"born0monday/CVE-2025-8760","title":"born0monday/CVE-2025-8760","date":"2025-10-30","url":"https://github.com/born0monday/CVE-2025-8760"}],"products":[{"vendor":"instar","product":"2k+"},{"vendor":"instar","product":"4k"}],"references":[{"url":"https://vuldb.com/?id.319863","tags":["vdb-entry","technical-description"]},{"url":"https://vuldb.com/?ctiid.319863","tags":["signature","permissions-required"]},{"url":"https://modzero.com/static/MZ-25-03_modzero_INSTAR.pdf","tags":["related"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-8760"},{"url":"https://github.com/advisories/GHSA-4jm8-qw96-rm2j"}],"sources":{"cve":[{"id":"CVE-2025-8760","title":"INSTAR 2K+/4K fcgi_server base64_decode buffer overflow","description":"A vulnerability was identified in INSTAR 2K+ and 4K 3.11.1 Build 1124. This affects the function base64_decode of the component fcgi_server. The manipulation of the argument Authorization leads to buffer overflow. It is possible to initiate the attack remotely.","status":"published","published":"2025-08-13T06:14:02.783Z","modified":"2025-08-13T13:31:00.583Z","cvss":[{"version":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X","level":"critical","assessor":"cna"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:X/RL:W/RC:R","level":"critical","assessor":"cna"},{"version":"3.0","score":9.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:X/RL:W/RC:R","level":"critical","assessor":"cna"},{"version":"2.0","score":10,"vector":"AV:N/AC:L/Au:N/C:C/I:C/A:C/E:ND/RL:W/RC:UR","assessor":"cna"}],"cwes":["CWE-120","CWE-119"],"updated_at":"2026-11-02T14:32:38.025852Z"}],"euvd":[{"id":"EUVD-2025-24545","description":"A vulnerability was identified in INSTAR 2K+ and 4K 3.11.1 Build 1124. This affects the function base64_decode of the component fcgi_server. The manipulation of the argument Authorization leads to buffer overflow. It is possible to initiate the attack remotely.","status":"published","published":"2025-08-13T06:14:02Z","modified":"2025-08-13T13:31:00Z","cvss":[{"version":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X","level":"critical"}],"updated_at":"2026-11-02T20:31:58.34572Z"}],"ghsa":[{"id":"GHSA-4jm8-qw96-rm2j","title":"A vulnerability was identified in INSTAR 2K+ and 4K 3.11.1 Build 1124. This affects the function...","description":"A vulnerability was identified in INSTAR 2K+ and 4K 3.11.1 Build 1124. This affects the function base64_decode of the component fcgi_server. The manipulation of the argument Authorization leads to buffer overflow. It is possible to initiate the attack remotely.","status":"published","published":"2025-08-13T09:30:31Z","modified":"2025-08-13T09:30:32Z","cvss":[{"version":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"critical"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-119"],"updated_at":"2026-11-02T15:03:16.090631Z"}],"nvd":[{"id":"CVE-2025-8760","description":"A vulnerability was identified in INSTAR 2K+ and 4K 3.11.1 Build 1124. This affects the function base64_decode of the component fcgi_server. The manipulation of the argument Authorization leads to buffer overflow. It is possible to initiate the attack remotely.","status":"published","published":"2025-08-13T07:15:28.637Z","modified":"2026-06-17T10:07:34.57Z","cvss":[{"version":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"critical","assessor":"secondary"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"secondary"},{"version":"2.0","score":10,"vector":"AV:N/AC:L/Au:N/C:C/I:C/A:C","level":"high","assessor":"secondary"}],"cwes":["CWE-119","CWE-120"],"updated_at":"2026-11-02T14:11:23.594522Z"}]}}