Biosig libbiosig 3.9.1 MFER Parser stack-based overflow

Summaryinfo

A vulnerability marked as critical has been reported in Biosig libbiosig 3.9.1. The impacted element is an unknown function of the component MFER Parser. The manipulation leads to stack-based overflow. This vulnerability is traded as CVE-2025-66045. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Biosig libbiosig 3.9.1. It has been rated as very critical. This issue affects an unknown code of the component MFER Parser. The manipulation with an unknown input leads to a stack-based overflow vulnerability. Using CWE to declare the problem leads to CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Several stack-based buffer overflow vulnerabilities exists in the MFER parsing functionality of The Biosig Project libbiosig 3.9.1. A specially crafted MFER file can lead to arbitrary code execution. An attacker can provide a malicious file to trigger these vulnerabilities.When Tag is 65

The advisory is shared at talosintelligence.com. The identification of this vulnerability is CVE-2025-66045 since 11/21/2025. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 12/14/2025).

The vulnerability scanner Nessus provides a plugin with the ID 278428 (Linux Distros Unpatched Vulnerability : CVE-2025-66045), which helps to determine the existence of the flaw in a target environment.

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 Tenable (278428). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• Biosig

Name

• libbiosig

Version

• 3.9.1

CPE 2.3info

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CPE 2.2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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