CVE-2024-50388Known exploitationNetwork attack vector

Unauthenticated code execution via rsync credential injection

Published Dec 6, 2024 · Updated Dec 6, 2024

OS command injection in QNAP HBS 3 Hybrid Backup Sync before 25.1.1.673 allows remote attackers to execute code as admin. The rsync daemon fails to validate a supplied username and password before using the credential string in a system call. Authentication is not required, and successful exploitation runs attacker-controlled commands with administrative privileges on the NAS.

CVSS severity9.5
Critical
EPSS probability2.30%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in QNAP HBS 3 Hybrid Backup Sync before 25.1.1.673 allows remote attackers to execute code as admin. The rsync daemon fails to validate a supplied username and password before using the credential string in a system call. Authentication is not required, and successful exploitation runs attacker-controlled commands with administrative privileges on the NAS.

The record

CVE
CVE-2024-50388
Published
Dec 6, 2024
Updated
Dec 6, 2024
Vendor
Linn Products Limited
Product
HBS 3 Hybrid Backup Sync
Classifications
CWE-77, CWE-78, CAPEC-88, T1059
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 6, 2024CVE publishedPublication date reported by the CVE source.
  2. Dec 6, 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=25.1.x <25.1.1.673

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Linn Products Limited · HBS 3 Hybrid Backup Syncversion=25.1.x <25.1.1.673

Published CVSS scores

9.5QNAP Systems, Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
9.8NIST NVDCVSS: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.

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
Privilegesunauthenticated
Known exploitationReported
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CAPEC-88OS Command Injection
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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