CVE-2025-54492Network attack vector

Code execution via unchecked MFER sample-skew length

Published Aug 25, 2025 · Updated Aug 25, 2025

Stack-based buffer overflow in The BioSig Project libbiosig 3.9.0 allows remote attackers to execute code through a crafted MFER file. The MFER tag 67 branch in sopen_extended passes the attacker-controlled len value to ifread with the address of the four-byte stack integer skew, without checking that the read fits. Any network-reachable application that parses an attacker-supplied MFER file through the library exposes its process to memory corruption and arbitrary code execution without authentication.

CVSS severity9.8
Critical
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in The BioSig Project libbiosig 3.9.0 allows remote attackers to execute code through a crafted MFER file. The MFER tag 67 branch in sopen_extended passes the attacker-controlled len value to ifread with the address of the four-byte stack integer skew, without checking that the read fits. Any network-reachable application that parses an attacker-supplied MFER file through the library exposes its process to memory corruption and arbitrary code execution without authentication.

The record

CVE
CVE-2025-54492
Published
Aug 25, 2025
Updated
Aug 25, 2025
Vendor
The BioSig Project
Product
libbiosig
Classifications
CWE-121
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 25, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.9.0
  2. Affected versionversion=Master Branch (35a819fa)

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The BioSig Project · libbiosigversion=3.9.0; version=Master Branch (35a819fa)

Published CVSS scores

9.8TalosCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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