CVE-2025-54489CWE-121

A stack-based buffer overflow vulnerability exists in the MFER parsing functionality of The Biosig Project libbiosig 3.9.0 and Master Branch (35a819fa)

Critical · published August 25, 2025

CVSS v3.1
9.8
EPSS
1%
Percentile
52.9
In the wild
Unconfirmed
What it is

🚨 A stack-based buffer overflow in libbiosig could turn your system into a playground for attackers with a simple, specially crafted MFER file! 🔥 Think of it like a restaurant where the chef serves a dish that’s meant for two, but the waiter accidentally brings out a giant platter instead — it spills all over the kitchen! Here, the buffer is the table, and if it overflows, chaos ensues. This vulnerability allows attackers to execute arbitrary code, potentially giving them full control over your system. If exploited, it's like handing over the keys to your castle and rolling out the welcome mat for anyone who wants to waltz right in. The consequences could be absolutely devastating!

Put simply

Think of it like a restaurant where the chef serves a dish that’s meant for two, but the waiter accidentally brings out a giant platter instead — it spills all over the kitchen! Here, the buffer is the table, and if it overflows, chaos ensues. In the libbiosig 3.9.0, a crafted MFER file can trigger a stack-based buffer overflow due to a mismatch in the expected data length, allowing attackers to overwrite the memory beyond the buffer's capacity.

What to do

This vulnerability allows attackers to execute arbitrary code, potentially giving them full control over your system. If exploited, it's like handing over the keys to your castle and rolling out the welcome mat for anyone who wants to waltz right in. The consequences could be absolutely devastating! Immediately patch to the latest version of libbiosig to address this vulnerability. Review your code for any other handling of MFER files to ensure they don’t allow buffer issues. Implement runtime protections to further safeguard your applications! You've got this! Take action now, and you'll secure your systems against this exploitation! 🛡️

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
0.00706 · 52.9th percentile
Weakness
CWE-121 · Stack-based Buffer Overflow
Published
2025-08-25T13:53Z
EPSS history
Timeline
  • 25 AUG 13:53Z
    A stack-based buffer overflow vulnerability exists in the MFER parsing functionality of The Biosig Project libbiosig 3.9.0 and Master Branch (35a819fa)
    cvelistv5