CVE-2025-53557
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 heap-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.
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 heap-based buffer overflow vulnerability exists in libbiosig's MFER file parser. When parsing specially crafted MFER files, the parser fails to properly validate bounds before writing data to the heap, allowing an attacker to overwrite adjacent memory and potentially execute arbitrary code.
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= 3.9.0CVSS 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 installedSearch for libbiosig libraries or headers on the system using package managers (dpkg, rpm, brew) or by scanning common library directories (/usr/lib, /usr/local/lib). Also check if applications linked against libbiosig exist.Affected if libbiosig library files are found on the system
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Determine installed libbiosig versionRun version check commands provided by the libbiosig package, or use tools like 'strings' on the library file to search for version strings, or query the library through any available version reporting utility.Affected if The installed version is 3.9.0
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Identify applications using libbiosigUse 'ldd' on binaries or 'ldconfig -p' to list executables linked against libbiosig. Review application dependencies and documentation to identify software that relies on libbiosig.Affected if Applications linked to libbiosig are present and process external files
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Check for MFER file processing activityReview application logs, file access patterns, or user workflows to determine if MFER (Medical Framework for Electronic Records) files are being processed by any libbiosig-dependent software.Affected if MFER files are processed by libbiosig-enabled applications
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Verify MFER parser is accessibleIf libbiosig includes a command-line tool (such as 'biosig' or similar), attempt to invoke help or list supported formats to confirm MFER format support is compiled into the library.Affected if MFER format is listed as a supported input format
The environment is affected if libbiosig version 3.9.0 is installed and MFER files are processed by applications using this library.
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.
From vendor dataUpdate libbiosig to a patched version that includes proper bounds checking in the MFER parser. Until a patch is available, disable MFER file parsing or validate MFER files with a separate tool before processing with libbiosig.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-53557 — 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-2025-53557 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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