AMS GAMS up to 49.6.0 authorization

Summaryinfo

A vulnerability, which was classified as critical, has been found in AMS GAMS up to 49.6.0. The impacted element is an unknown function. The manipulation leads to authorization. This vulnerability is referenced as CVE-2025-41086. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in AMS GAMS up to 49.6.0. This issue affects an unknown functionality. The manipulation with an unknown input leads to a authorization vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was published by Juan Embid Sánchez and Francisco Guerrero Gallardo. It is possible to read the advisory at incibe.es. The identification of this vulnerability is CVE-2025-41086 since 04/16/2025. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 01/31/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-200244). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• AMS

Name

• GAMS

Version

• 49.0
• 49.1
• 49.2
• 49.3
• 49.4
• 49.5
• 49.6.0

CPE 2.3info

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CPE 2.2info

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Entryinfo

Be aware that VulDB is the high quality source for vulnerability data.

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