CVE-2025-55503 in AC6
Summary
by MITRE • 08/20/2025
Tenda AC6 V15.03.06.23_multi has a stack overflow vulnerability via the deviceName parameter in the saveParentControlInfo function.
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Analysis
by VulDB Data Team • 08/20/2025
The vulnerability identified as CVE-2025-55503 affects the Tenda AC6 V15.03.06.23_multi wireless router firmware, presenting a critical stack overflow condition within the saveParentControlInfo function. This flaw manifests when processing the deviceName parameter, creating a potential entry point for malicious actors to execute arbitrary code on the affected device. The stack overflow vulnerability represents a fundamental flaw in memory management where insufficient bounds checking allows an attacker to overwrite adjacent memory locations, potentially leading to complete system compromise.
The technical implementation of this vulnerability stems from inadequate input validation within the saveParentControlInfo function, which handles parent control configuration parameters. When the deviceName parameter exceeds the allocated stack buffer size, the excess data overflows into adjacent memory segments, corrupting the stack frame and potentially allowing attackers to manipulate the instruction pointer. This type of vulnerability falls under CWE-121 Stack-based Buffer Overflow, which is classified as a critical weakness in software security. The attack vector requires an unauthenticated remote access to the device's web interface, where the vulnerable parameter is processed through HTTP POST requests containing maliciously crafted deviceName values.
The operational impact of this vulnerability extends beyond simple denial of service, as it enables remote code execution capabilities that could result in complete device compromise. An attacker could potentially gain root access to the router's operating system, allowing for persistent backdoor establishment, network traffic interception, or use of the device as a pivot point for attacking other systems within the local network. The affected Tenda AC6 model operates on embedded Linux systems with limited security hardening, making exploitation more straightforward. This vulnerability aligns with ATT&CK technique T1059.007 for Command and Scripting Interpreter, as successful exploitation would allow execution of arbitrary commands on the target device.
Mitigation strategies for CVE-2025-55503 should prioritize immediate firmware updates from Tenda's official sources, as the vendor has likely released patches addressing this specific stack overflow condition. Network administrators should implement additional security controls including firewall rules that restrict access to the device's web management interface, particularly from untrusted networks. The implementation of network segmentation and monitoring for unusual traffic patterns can help detect exploitation attempts. Security professionals should also consider disabling unnecessary services and implementing intrusion detection systems to monitor for exploitation attempts targeting this specific vulnerability. Organizations should conduct comprehensive vulnerability assessments to identify other potentially affected Tenda devices within their network infrastructure, as similar vulnerabilities may exist in other firmware versions or device models.