CVE-2024-21812Public exploitNetwork attack vector

Code execution via overflowing FAMOS channel count

Published Feb 20, 2024 · Updated Nov 4, 2025

Integer overflow in The BioSig Project libbiosig 2.5.0 and Master Branch (ab0ee111) allows attackers to execute code via a crafted FAMOS file. In sopen_FAMOS_read, repeated CG records add a 32-bit channel count to the 16-bit hdr->NS field, wrap the allocation size, and leave CHAN indexing beyond the shrunken hdr->CHANNEL buffer. FAMOS parsing is enabled by default in affected builds, and a malicious file can overwrite heap data and gain process-level code execution.

CVSS severity9.8
Critical
EPSS probability1.76%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in The BioSig Project libbiosig 2.5.0 and Master Branch (ab0ee111) allows attackers to execute code via a crafted FAMOS file. In sopen_FAMOS_read, repeated CG records add a 32-bit channel count to the 16-bit hdr->NS field, wrap the allocation size, and leave CHAN indexing beyond the shrunken hdr->CHANNEL buffer. FAMOS parsing is enabled by default in affected builds, and a malicious file can overwrite heap data and gain process-level code execution.

The record

CVE
CVE-2024-21812
Published
Feb 20, 2024
Updated
Nov 4, 2025
Vendor
Fedora Project
Product
Fedora Linux
Classifications
CWE-190, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 20, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 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=40

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Fedora Project · Fedora Linuxversion=40
The BioSig Project · libbiosigversion=2.5.0; version=Master Branch (ab0ee111)

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 exploitPublished

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1203Exploitation for Client Execution

Public exploit references

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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