CVE-2025-54483
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA 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 8759 of biosig.c on the current master branch (35a819fa), when the Tag is 5: else if (tag==5) //0x05: number of channels { uint16_t oldNS=hdr->NS; if (len>4) fprintf(stderr,"Warning MFER tag5 incorrect length %i>4\n",len); curPos += ifread(buf,1,len,hdr);
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceA stack-based buffer overflow exists in libbiosig's MFER file parser (biosig.c line 8759). When parsing MFER files with Tag=5 (number of channels), the code reads len bytes into a fixed-size buffer without proper bounds checking. If len exceeds the buffer size, data overflows onto the stack, allowing arbitrary code execution.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 3.9.1CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify if libbiosig is in useSearch for libbiosig library files (.so, .a, .dll) or header files in the system, or check if any application links against libbiosigAffected if libbiosig library files or development headers are present on the system
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Determine installed libbiosig versionCheck the library version through package manager, or inspect library metadata, or run 'strings' on the library file for version stringsAffected if The version is lower than 3.9.1
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Verify MFER file format support is enabledCheck application configuration or code that uses biosig for whether MFER format decoding is invoked; inspect the biosig library for MFER-related function callsAffected if The application or library processes MFER files using the biosig MFER parser
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Inspect the vulnerable code locationIf source code is available, examine biosig.c around line 8759 for the Tag=5 parsing logic and the ifread() call with len parameter into fixed bufferAffected if The source code shows the unbounded read without bounds validation on len before line 8759
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Check for suspicious crash logs or exploit indicatorsReview application logs, crash dumps, or system logs for stack buffer overflow errors related to MFER file processingAffected if Buffer overflow crashes are logged when processing MFER files with Tag=5 containing unexpectedly large len values
The environment is affected if libbiosig version is below 3.9.1 and MFER file format parsing is enabled and used to process untrusted MFER files.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped3.9.1
Apply vendor patch or update libbiosig to latest version. If no patch available, implement bounds validation on the len parameter before ifread() call to ensure it does not exceed buffer capacity.
libbiosig 3.9.1
- Upgrade libbiosig to version 3.9.1 or later
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation4.0 h
- Testing6.0 h
- Review / QA3.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-54483 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-54483 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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