CVE-2024-53700: QNAP QHora Router RCE Vulnerability

CVE-2024-53700 Overview

CVE-2024-53700 is a command injection vulnerability affecting QNAP QuRouter firmware on QHora series routers. Remote attackers with administrator credentials can execute arbitrary operating system commands on affected devices. QNAP addressed the flaw in QuRouter 2.4.6.028 and later releases. The vulnerability is classified under CWE-77 (Improper Neutralization of Special Elements used in a Command).

Critical Impact
Authenticated remote attackers can inject arbitrary shell commands into the router operating system, enabling full device compromise, persistence, and lateral movement into networks protected by the QHora appliance.

Affected Products

QNAP QuRouter 2.4.0.190 through 2.4.5.032 running on QHora series appliances
QNAP QuRouter builds dated between 20240522 and 20241029
Any QHora device that has not been upgraded to QuRouter 2.4.6.028 or later

Discovery Timeline

2025-03-07 - CVE-2024-53700 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-53700

Vulnerability Analysis

The vulnerability resides in the QuRouter firmware that powers QNAP QHora security routers. An administrative interface accepts input that flows into an operating system command without proper neutralization of shell metacharacters. Attackers who reach the management interface over the network with valid administrator credentials can append or inject additional commands that execute in the router's underlying Linux environment.

Successful exploitation runs code with the privileges of the router service handling the request. This exposes routing tables, VPN configurations, and DNS settings. Because QHora appliances typically sit at the network edge, a compromised device grants the attacker a persistent foothold for traffic interception and pivoting into internal networks.

Root Cause

The root cause is improper neutralization of special elements used in an OS command, tracked as CWE-77. Administrator-supplied parameters reach a command interpreter without sanitization or safe-argument passing. Shell metacharacters such as ;, &&, |, and backticks are interpreted rather than treated as literal data.

Attack Vector

The attack vector is network-based and requires high privileges. An attacker must first obtain administrator credentials through phishing, credential reuse, brute force, or a chained authentication weakness. The attacker then submits a crafted request to the vulnerable management endpoint. No user interaction is required to trigger the injected command once the request is sent. Public proof-of-concept exploit code is not available at this time, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

See the QNAP Security Advisory QSA-25-07 for vendor-supplied technical detail.

Detection Methods for CVE-2024-53700

Indicators of Compromise

Unexpected child processes spawned by QuRouter web management daemons, especially shells such as /bin/sh or /bin/busybox.
Outbound connections from the QHora device to unfamiliar IP addresses or newly registered domains.
Modifications to router configuration files, firewall rules, or DNS settings outside of scheduled change windows.
Administrator sessions originating from unexpected geolocations or ASNs in QuRouter access logs.

Detection Strategies

Monitor QuRouter administrative HTTP/HTTPS requests for payloads containing shell metacharacters (;, |, &, `, $().
Correlate successful administrator logins with subsequent configuration changes and outbound network flows to detect misuse of valid credentials.
Alert on any firmware version string reported as earlier than 2.4.6.028 in inventory or scan data.

Monitoring Recommendations

Forward QuRouter syslog and management-plane logs to a centralized SIEM for retention and correlation.
Baseline outbound traffic from QHora appliances and alert on deviations, particularly to non-QNAP infrastructure.
Track administrator authentication events and flag repeated failures followed by success from the same source address.

How to Mitigate CVE-2024-53700

Immediate Actions Required

Upgrade QuRouter to version 2.4.6.028 or later on all QHora devices.
Rotate administrator credentials and any shared secrets stored on the router after upgrade.
Restrict the management interface to trusted internal networks and disable WAN-side administration.
Enforce multi-factor authentication where supported and review all existing administrator accounts for legitimacy.

Patch Information

QNAP has released fixed firmware in QuRouter 2.4.6.028 and later. Apply the update through the QuRouter web interface or the QNAP update mechanism. Refer to the QNAP Security Advisory QSA-25-07 for detailed remediation steps and downloads.

Workarounds

Limit access to the QuRouter administrative interface through firewall access control lists that permit only trusted management hosts.
Place QHora devices behind a VPN or bastion so that administrative endpoints are not reachable directly from the internet.
Continuously audit administrator accounts and remove any that are unused, shared, or lack strong authentication.

bash

# Restrict QuRouter management access to a trusted subnet at the network edge
iptables -A INPUT -p tcp --dport 8080 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 8080 -j DROP
iptables -A INPUT -p tcp --dport 443  -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443  -j DROP