CVE-2025-41086
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-12-02

Last updated on: 2026-02-03

Assigner: Spanish National Cybersecurity Institute, S.A. (INCIBE)

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.
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Meta Information
Published
2025-12-02
Last Modified
2026-02-03
Generated
2026-06-16
AI Q&A
2025-12-02
EPSS Evaluated
2026-06-14
NVD
CVE-2025-41086
Affected Vendors & Products
Showing 4 associated CPEs
Vendor Product Version / Range
gams gams 51.1.0
gams gams 51.2.0
gams gams 49.6.0
gams gams From 49.1.0 (inc) to 49.7.0 (inc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-639 The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.
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Executive Summary

This vulnerability exists in the access control system of the GAMS licensing system. It allows an attacker to generate unlimited valid licenses by exploiting an insecure checksum algorithm used by the license validator. By knowing the checksum algorithm and the license format, the attacker can recalculate the checksum and create valid licenses, granting themselves full privileges without needing credentials or source code access. This results in unrestricted access to GAMS's mathematical models and commercial solvers.

Impact Analysis

The vulnerability can impact you by allowing unauthorized users to bypass licensing restrictions and gain full access to GAMS software features without proper authorization. This could lead to unauthorized use of the software, potential financial loss due to license evasion, and exposure of proprietary mathematical models and commercial solvers.

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