CVE-2024-39943Network attack vector

Authenticated command execution via shell-interpolated upload path

Published Jul 4, 2024 · Updated Aug 2, 2024

OS command injection in Rejetto HFS before 0.52.10 on Linux and macOS allows remote authenticated users to execute commands. The getDiskSpaceSync function in src/util-os.ts interpolates an upload-derived path into a df shell command passed to execSync. Upload permission is required, and successful exploitation runs arbitrary OS commands with the HFS process's privileges.

CVSS severity9.9
Critical
EPSS probability39.47%
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 Rejetto HFS before 0.52.10 on Linux and macOS allows remote authenticated users to execute commands. The getDiskSpaceSync function in src/util-os.ts interpolates an upload-derived path into a df shell command passed to execSync. Upload permission is required, and successful exploitation runs arbitrary OS commands with the HFS process's privileges.

The record

CVE
CVE-2024-39943
Published
Jul 4, 2024
Updated
Aug 2, 2024
Vendor
Rejetto
Product
HFS (HTTP File Server)
Classifications
CWE-78, CWE-284, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 4, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record 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=0 <0.52.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Rejetto · HFS (HTTP File Server)version=0 <0.52.10

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.9MITRECVSS:3.1/AC:L/AV:N/A:H/C:H/I:H/PR:L/S:C/UI:N

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-284Improper Access Control
T1059.004Unix Shell

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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