Biosig libbiosig 3.9.1 MFER Parser stack-based overflow

Summaryinfo

A vulnerability identified as critical has been detected in Biosig libbiosig 3.9.1. Impacted is an unknown function of the component MFER Parser. Performing a manipulation results in stack-based overflow. This vulnerability is reported as CVE-2025-66043. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Biosig libbiosig 3.9.1. It has been classified as very critical. This affects some unknown functionality of the component MFER Parser. The manipulation with an unknown input leads to a stack-based overflow vulnerability. CWE is classifying the issue as 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). This is going to have an impact on 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 3

It is possible to read the advisory at talosintelligence.com. This vulnerability is uniquely identified as CVE-2025-66043 since 11/21/2025. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for 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 12/14/2025).

The vulnerability scanner Nessus provides a plugin with the ID 278396 (Linux Distros Unpatched Vulnerability : CVE-2025-66043), 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 (278396). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• Biosig

Name

• libbiosig

Version

• 3.9.1

CPE 2.3info

• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

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

Discussion