CVE-2024-21795Public exploitNetwork attack vector

Code execution via unchecked EGI event count

Published Feb 20, 2024 · Updated Nov 4, 2025

Heap-based buffer overflow in The BioSig Project libbiosig 2.5.0 allows remote attackers to execute arbitrary code via a crafted .egi file. In sopen_extended, an unbounded EGI event count drives pointer writes beyond the fixed 257-entry CodeDesc heap allocation. A consuming process must parse the file with 2.5.0 or Master Branch (ab0ee111), after which the overwrite can execute code in that process.

CVSS severity9.8
Critical
EPSS probability1.79%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in The BioSig Project libbiosig 2.5.0 allows remote attackers to execute arbitrary code via a crafted .egi file. In sopen_extended, an unbounded EGI event count drives pointer writes beyond the fixed 257-entry CodeDesc heap allocation. A consuming process must parse the file with 2.5.0 or Master Branch (ab0ee111), after which the overwrite can execute code in that process.

The record

CVE
CVE-2024-21795
Published
Feb 20, 2024
Updated
Nov 4, 2025
Vendor
Fedora Project
Product
Fedora Linux
Classifications
CWE-122, 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-122Heap-based Buffer Overflow
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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