Stack-Based Buffer Overflow in Biosig Project's libbiosig Software
CVE-2025-66047

9.8CRITICAL

Key Information:

Vendor

The BiOSig Project

Status
LibbiOSig
Vendor
CVE Published:
11 December 2025

What is CVE-2025-66047?

A critical stack-based buffer overflow vulnerability exists in the MFER parsing functionality of libbiosig version 3.9.1. By crafting a specially designed MFER file, an attacker can exploit this vulnerability to execute arbitrary code. This can occur when the tag is set to 131, allowing unauthorized system control and potential compromise of data integrity and confidentiality.

Affected Version(s)

libbiosig 3.9.1

References

https://talosintelligence.com/vulnerability_reports/TALOS...

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Discovered by Mark Bereza and Lilith >_> of Cisco Talos.
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CVE-2025-66047 : Stack-Based Buffer Overflow in Biosig Project's libbiosig Software