CVE-2025-54483Network attack vector

Code execution via unchecked MFER tag length

Published Aug 25, 2025 · Updated Nov 3, 2025

Stack-based buffer overflow in The BioSig Project libbiosig 3.9.0 and master branch 35a819fa allows attackers to execute code via a crafted MFER file. The MFER tag 5 branch in sopen_extended only warns when the decoded length exceeds four, then passes that attacker-controlled length to ifread for copying into a 128-byte stack buffer. Processing an untrusted MFER file is sufficient to corrupt the host process stack, enabling code execution with that process's privileges.

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 and master branch 35a819fa allows attackers to execute code via a crafted MFER file. The MFER tag 5 branch in sopen_extended only warns when the decoded length exceeds four, then passes that attacker-controlled length to ifread for copying into a 128-byte stack buffer. Processing an untrusted MFER file is sufficient to corrupt the host process stack, enabling code execution with that process's privileges.

The record

CVE
CVE-2025-54483
Published
Aug 25, 2025
Updated
Nov 3, 2025
Vendor
The BioSig Project
Product
libbiosig
Classifications
CWE-121, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 25, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 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

9.8Cisco TalosCVSS: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
T1203Exploitation for Client Execution

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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