CVE-2024-20328

Local command execution via VirusEvent filename substitution

Published Mar 1, 2024 · Updated Nov 4, 2025

OS command injection in ClamAV 1.2.0 and 1.2.1 allows local users to execute commands as the ClamD service account via a crafted filename. The VirusEvent handler substitutes the detected file path for the %f token inside a configured shell command without separating the filename from command syntax. Exploitation requires VirusEvent to be configured with %f and a locally supplied file to trigger a malware detection, after which injected commands run with the ClamD account's privileges.

CVSS severity5.3
Medium
EPSS probability84.84%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in ClamAV 1.2.0 and 1.2.1 allows local users to execute commands as the ClamD service account via a crafted filename. The VirusEvent handler substitutes the detected file path for the %f token inside a configured shell command without separating the filename from command syntax. Exploitation requires VirusEvent to be configured with %f and a locally supplied file to trigger a malware detection, after which injected commands run with the ClamD account's privileges.

The record

CVE
CVE-2024-20328
Published
Mar 1, 2024
Updated
Nov 4, 2025
Vendor
ClamAV
Product
ClamAV
Classifications
CWE-78, T1059
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 1, 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=1.2.0
  2. Affected versionversion=1.2.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

ClamAV · ClamAVversion=1.2.0; version=1.2.1

Published CVSS scores

5.3Cisco Systems, Inc.CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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