How severe is CVE-2025-54493?

CVE-2025-54493 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-54493 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-54493?

CVE-2025-54493 affects Libbiosig Project Libbiosig. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-54493?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2025-54493 have an EU (EUVD) identifier?

Yes. CVE-2025-54493 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-25670.

When was CVE-2025-54493 published?

CVE-2025-54493 was published on 2025-08-25 and last updated on 2026-06-17.

CVE-2025-54493

CVE-2025-54493 is a critical-severity vulnerability in Libbiosig Project Libbiosig with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-121.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-25670
Weakness: CWE-121
Affected product: Libbiosig Project Libbiosig
Published: 2025-08-25
Last modified: 2026-06-17

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 9184 of biosig.c on the current master branch (35a819fa), when the Tag is 131: else if (tag==131) //0x83 { // Patient Age if (len!=7) fprintf(stderr,"Warning MFER tag131 incorrect length %i!=7\n",len); curPos += ifread(buf,1,len,hdr);

Frequently asked questions

What is CVE-2025-54493?: 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 9184 of biosig.c on the current master branch (35a819fa), when the Tag is 131: else if (tag==131) //0x83 { // Patient Age if (len!=7) fprintf(stderr,"Warning MFER tag131 incorrect length %i!=7\n",len); curPos += ifread(buf,1,len,hdr);
How severe is CVE-2025-54493?: CVE-2025-54493 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-54493 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-54493?: CVE-2025-54493 affects Libbiosig Project Libbiosig. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-54493?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-54493 have an EU (EUVD) identifier?: Yes. CVE-2025-54493 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-25670.
When was CVE-2025-54493 published?: CVE-2025-54493 was published on 2025-08-25 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:libbiosig_project:libbiosig:*:*:*:*:*:*:*:*

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