Code execution via unchecked Tag 65 length
Published Dec 11, 2025 · Updated Dec 11, 2025
Stack-based buffer overflow in The BioSig Project libbiosig 3.9.1 allows attackers to execute arbitrary code via a crafted MFER file. In the Tag 65 patient-event branch of sopen_extended, ifread copies the file-declared length into a 128-byte stack buffer without checking its capacity. Processing the file is sufficient to overwrite attacker-controlled data past the buffer and crash the calling process or execute code in its context.
Summary
What happened
Stack-based buffer overflow in The BioSig Project libbiosig 3.9.1 allows attackers to execute arbitrary code via a crafted MFER file. In the Tag 65 patient-event branch of sopen_extended, ifread copies the file-declared length into a 128-byte stack buffer without checking its capacity. Processing the file is sufficient to overwrite attacker-controlled data past the buffer and crash the calling process or execute code in its context.
The record
- CVE
- CVE-2025-66045
- Published
- Dec 11, 2025
- Updated
- Dec 11, 2025
- Vendor
- The BioSig Project
- Product
- libbiosig
- Classifications
- CWE-121, CWE-787, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 11, 2025CVE publishedPublication date reported by the CVE source.
- Dec 11, 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.
- Affected versionversion=3.9.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
- Cisco Talos MFER Tag 65 proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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