CVE-2025-66047CWE-121CWE-787

CVE-2025-66047

Critical · published December 11, 2025

CVSS v3.1
9.8
EPSS
1%
Percentile
45.0
In the wild
Unconfirmed
What it is

🚨 A single specially crafted MFER file could lead to arbitrary code execution on your system! 🔥 Think of it like a mischievous chef sneaking a dangerous ingredient into a recipe — once it’s in, it could ruin the whole dish or even poison the guests! If exploited, an attacker could gain full control over your system, leading to data theft, unauthorized access, or even a complete system takeover. This is a nightmare scenario for both individual users and organizations alike!

Put simply

Think of it like a mischievous chef sneaking a dangerous ingredient into a recipe — once it’s in, it could ruin the whole dish or even poison the guests! The vulnerabilities in the MFER parsing functionality of libbiosig 3.9.1 allow attackers to execute arbitrary code by manipulating buffer sizes, resulting in stack-based buffer overflows when processing maliciously crafted files.

What to do

If exploited, an attacker could gain full control over your system, leading to data theft, unauthorized access, or even a complete system takeover. This is a nightmare scenario for both individual users and organizations alike! Immediately update libbiosig to version 3.9.2 or later to patch these vulnerabilities. Additionally, review file handling procedures to ensure that only trusted MFER files are processed. Implement additional security measures to verify file integrity before processing. You've got this! With these steps, you’ll be on your way to securing your systems in no time. 🛡️

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00546 · 45.0th percentile
Weaknesses
CWE-121 · Stack-based Buffer Overflow; CWE-787 · Out-of-bounds Write
Published
2025-12-11T22:15Z
Affected products (1)
ProductVersionsFixed in
libbiosig_project/libbiosig< 3.9.23.9.2
References (2)
EPSS history
Timeline
  • 11 DEC 16:43Z
    Several stack-based buffer overflow vulnerabilities exists in the MFER parsing functionality of The Biosig Project libbiosig 3.9.1
    cvelistv5