CVE-2025-7914 in AC6
Summary
by MITRE • 07/21/2025
A vulnerability has been found in Tenda AC6 15.03.06.50 and classified as critical. Affected by this vulnerability is the function setparentcontrolinfo of the component httpd. The manipulation leads to buffer overflow. The attack can be launched remotely.
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Analysis
by VulDB Data Team • 07/24/2025
The vulnerability identified as CVE-2025-7914 represents a critical buffer overflow flaw in the Tenda AC6 router model running firmware version 15.03.06.50. This vulnerability specifically affects the httpd component's setparentcontrolinfo function, which handles parental control configuration settings within the router's web-based management interface. The buffer overflow occurs when processing user-supplied input through the web interface, creating a potential pathway for remote code execution and system compromise. The affected device operates under the Common Weakness Enumeration framework as CWE-121, which encompasses buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. This weakness directly aligns with the ATT&CK technique T1210, which describes exploitation of vulnerabilities in network infrastructure devices to gain unauthorized access and control over network resources.
The technical exploitation of this vulnerability enables remote attackers to craft malicious HTTP requests that trigger the buffer overflow condition within the httpd process. When the setparentcontrolinfo function processes malformed input parameters, it fails to properly validate or limit the length of user-supplied data, allowing an attacker to overwrite critical memory segments including return addresses and function pointers. This memory corruption can lead to arbitrary code execution with the privileges of the httpd process, which typically runs with elevated system permissions. The vulnerability's remote exploitability means that attackers do not require physical access to the device or network credentials to initiate the attack, making it particularly dangerous for enterprise and residential networks. The attack surface extends beyond simple command execution to include potential denial of service conditions, data exfiltration, and the establishment of persistent backdoors within the network infrastructure.
The operational impact of CVE-2025-7914 extends significantly beyond individual device compromise, as routers serve as critical network gateways that control traffic flow and access policies for entire network segments. Successful exploitation could enable attackers to intercept, modify, or block network communications, potentially leading to man-in-the-middle attacks, credential theft, and unauthorized access to connected devices. The vulnerability affects not only the router's web interface but also potentially impacts the underlying operating system and network services that depend on the httpd component. Network administrators may face challenges in detecting exploitation attempts since the attack occurs at the network infrastructure level, making traditional endpoint detection solutions ineffective. The vulnerability also creates risks for compliance with industry standards such as NIST 800-53 and ISO 27001, which require robust network infrastructure security controls and vulnerability management processes.
Mitigation strategies for CVE-2025-7914 should prioritize immediate firmware updates from Tenda, as the vendor is expected to release patched versions that implement proper input validation and bounds checking within the affected function. Network segmentation and firewall rules can help limit the attack surface by restricting access to the router's web interface from untrusted networks. Implementing intrusion detection systems that monitor for unusual HTTP request patterns and malformed input could provide early warning of exploitation attempts. Organizations should also consider disabling unnecessary web management interfaces and implementing multi-factor authentication for router access where possible. The vulnerability highlights the importance of regular firmware updates and security assessments for network infrastructure devices, as outlined in the NIST Cybersecurity Framework. Security teams should monitor for indicators of compromise related to this vulnerability and implement network monitoring to detect potential exploitation attempts. Additionally, the incident underscores the need for secure coding practices in embedded systems, particularly regarding input validation and memory management, as required by standards such as the OWASP Secure Coding Practices and the CERT Secure Coding Standards.