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DEBIAN-CVE-2025-54481

CriticalCVSS 9.8 / 10
Published Aug 25, 2025·Last modified Jun 15, 2026
Affected Components(0)

No affected components available

Description

A stack-based buffer overflow vulnerability exists in the MFER parsing functionality of The Biosig Project libbiosig 3.9.0 and Master Branch (35a819fa). A specially crafted MFER file can lead to arbitrary code execution. An attacker can provide a malicious file to trigger this vulnerability.This vulnerability manifests on line 8744 of biosig.c on the current master branch (35a819fa), when the Tag is 3:

			else if (tag==3) {
				// character code
				char v[17];		// [1]
				if (len>16) fprintf(stderr,"Warning MFER tag2 incorrect length %i>16\n",len);
				curPos += ifread(&v,1,len,hdr);
				v[len]  = 0;

In this case, the overflowed buffer is the newly-declared v [1] instead of buf. Since v is only 17 bytes large, much smaller values of len (even those encoded using a single octet) can trigger an overflow in this code path.

Risk Scores
Base Score
9.8

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.

Threat Intelligence
9.0

Active exploitation in the wild has been confirmed. Immediate patching or mitigation is required.

EPSS
N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

Related Vulnerabilities
  • CVE-2025-54481
    Upstream
  • EUVD-2025-25682
    Upstream

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Critical severity
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