{"id":"CVE-2025-41086","url":"https://www.cyber-defence.io/tools/cve/CVE-2025-41086","generatedAt":"2026-10-28T03:42:27.776Z","title":"Vulnerability in the access control system of the GAMS licensing system that allows unlimited valid licenses to be generated, bypassing any usage restrictions.","description":"Vulnerability in the access control system of the GAMS licensing system that allows unlimited valid licenses to be generated, bypassing any usage restrictions. The validator uses an insecure checksum algorithm; knowing this algorithm and the format of the license lines, an attacker can recalculate the checksum and generate a valid license to grant themselves full privileges without credentials or access to the source code, allowing them unrestricted access to GAMS's mathematical models and commercial solvers.","published":"2025-12-02T14:16:25.000Z","lastModified":"2026-10-18T18:10:00.000Z","status":"Analyzed","sourceIdentifier":"cve-coordination@incibe.es","cvss":{"version":"4.0","score":6.9,"severity":"MEDIUM","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/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/M"},"cwe":["CWE-639"],"affected":["gams/gams"],"epss":{"score":0.00213,"percentile":0.11591,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.21%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://www.gams.com/latest/docs/RN_51.html","tags":["Release Notes"],"source":"cve-coordination@incibe.es"},{"url":"https://www.incibe.es/en/incibe-cert/notices/aviso/authorization-bypass-gams-gams-development-corp","tags":["Third Party Advisory"],"source":"cve-coordination@incibe.es"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-41086","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}