CVE-2025-29360 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 time and timeZone parameters at /goform/SetSysTimeCfg. 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-2025-29360 affects the Tenda RX3 US_RX3V1.0br_V16.03.13.11_multi_TDE01 router firmware, representing a critical buffer overflow flaw within the device's web-based management interface. This issue resides in the /goform/SetSysTimeCfg endpoint which handles time and timezone configuration parameters, making it a prime target for exploitation due to its accessibility through standard network protocols. The vulnerability stems from improper input validation and insufficient bounds checking when processing user-supplied data, creating an exploitable condition that can be triggered through crafted HTTP requests.
The technical implementation of this buffer overflow vulnerability occurs when the router's firmware fails to properly validate the length of input data provided in the time and timeZone parameters. When an attacker sends a malformed request containing excessively long strings in these parameters, the device's processing logic attempts to copy this data into fixed-size buffers without adequate size verification. This fundamental flaw in memory management creates a condition where the buffer overflow can overwrite adjacent memory locations, potentially leading to arbitrary code execution or system instability. The vulnerability specifically maps to CWE-121, which describes stack-based buffer overflow conditions, and CWE-122, which covers heap-based buffer overflows, depending on the exact memory layout during exploitation.
From an operational standpoint, this vulnerability presents a significant risk to network security and availability, as it allows remote attackers to induce a Denial of Service condition without requiring authentication or privileged access. The attack surface is particularly concerning given that the affected endpoint is part of the standard web interface that typically remains accessible to external networks, especially in consumer and small office environments where routers are often configured with default settings. The DoS condition can result in complete service disruption, forcing network administrators to manually reset devices or potentially requiring firmware reinstallation to restore functionality. This vulnerability directly aligns with ATT&CK technique T1499.004, which covers network denial of service attacks, and T1566.001, representing spearphishing through social engineering.
The mitigation strategies for this vulnerability should encompass both immediate defensive measures and long-term remediation approaches. Network administrators should implement firewall rules to restrict access to the affected web interface, particularly blocking external access to the /goform/SetSysTimeCfg endpoint. Additionally, firmware updates from Tenda should be deployed immediately upon availability to address the root cause of the buffer overflow. The implementation of input validation controls, including proper length checking and sanitization of all user-supplied parameters, should be enforced at the application level. Organizations should also consider network monitoring solutions that can detect anomalous traffic patterns or oversized packets targeting the affected endpoint. The vulnerability demonstrates the importance of applying the principle of least privilege and input validation, as recommended by the OWASP Top Ten and NIST cybersecurity guidelines, to prevent similar issues in network infrastructure devices.