Vulnerability · Published Dec 2, 2025 · Assigned by INCIBE
CVE-2025-41086Authorization bypass in GAMS from GAMS Development Corp.
Medium 6.9
In plain English
A medium-severity authorization bypass via user-controlled key in GAMS from AMS Development Corp.. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 14% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| AMS Development Corp. | GAMS | 0 – through 49.6.0 |
Weakness: CWE-639 · 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