CVE-2025-29358 in RX3
Summary
by MITRE • 03/13/2025
Tenda RX3 US_RX3V1.0br_V16.03.13.11_multi_TDE01 is vulnerable to Buffer Overflow via the firewallEn parameter at /goform/SetFirewallCfg. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted packet.
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Analysis
by VulDB Data Team • 08/01/2025
The vulnerability identified as CVE-2025-29358 affects the Tenda RX3 US_RX3V1.0br_V16.03.13.11_multi_TDE01 wireless router firmware, representing a critical buffer overflow condition within the device's web-based management interface. This flaw exists in the SetFirewallCfg form handler located at the /goform/SetFirewallCfg endpoint, where the firewallEn parameter fails to properly validate input length before processing. The buffer overflow occurs when an attacker crafts a malicious packet containing an excessively long string value for the firewallEn parameter, causing the router's memory management to overflow beyond allocated boundaries. This specific implementation vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The affected device operates under a web interface that processes HTTP POST requests containing form data, making it susceptible to remote exploitation through crafted web requests.
The technical exploitation of this vulnerability enables attackers to execute a denial of service attack against the targeted router by sending a specially crafted packet to the vulnerable endpoint. When the firmware processes the malformed firewallEn parameter, the buffer overflow causes the router's web server process to crash or terminate unexpectedly, resulting in service disruption for legitimate users. The DoS condition manifests as the router becoming unresponsive to web management requests and potentially losing network connectivity for connected devices. This attack vector requires minimal privileges since it targets the web interface accessible to unauthenticated users, making it particularly dangerous for network administrators who rely on consistent device availability. The vulnerability demonstrates poor input validation practices and lacks proper bounds checking mechanisms that would normally prevent such memory corruption scenarios. The attack can be executed remotely without requiring physical access or specialized equipment, as the vulnerability exists in the network-accessible web management interface.
The operational impact of this vulnerability extends beyond simple service disruption, potentially compromising network security infrastructure and availability. Network administrators may experience unexpected downtime during critical operations, while the device's denial of service condition could be exploited as part of broader attack campaigns targeting network availability. The vulnerability affects the router's ability to maintain its firewall configuration, which represents a fundamental security control within the device. Attackers could potentially leverage this DoS condition to disrupt network access for legitimate users, creating opportunities for more sophisticated attacks such as man-in-the-middle scenarios or network reconnaissance. The affected firmware version suggests this vulnerability exists in a relatively recent release, indicating that even newer devices may contain similar buffer overflow flaws in their web interface implementations. This type of vulnerability also increases the attack surface for potential exploitation through automated scanning tools that can identify and target devices with known buffer overflow conditions.
Mitigation strategies for CVE-2025-29358 should prioritize immediate firmware updates from Tenda, as this represents the most effective solution to address the root cause of the buffer overflow. Network administrators should implement network segmentation to isolate affected devices from critical network segments and monitor for suspicious traffic patterns that might indicate exploitation attempts. The implementation of intrusion detection systems capable of identifying malformed HTTP requests targeting the /goform/SetFirewallCfg endpoint can provide early warning of potential attacks. Additionally, network administrators should consider disabling unnecessary web management interfaces and restricting access to the device through firewall rules that limit connections to trusted IP addresses only. Security monitoring should focus on detecting abnormal traffic patterns related to the vulnerable endpoint, particularly unusual POST requests containing excessively long parameter values. Organizations should also implement regular vulnerability assessments to identify similar buffer overflow conditions in other network devices and firmware implementations, as this vulnerability type remains prevalent in embedded network devices due to resource constraints and legacy code development practices. The ATT&CK framework categorizes this vulnerability under T1499.004 for Network Denial of Service, with potential lateral movement opportunities through compromised network infrastructure.