CVE-2025-5629 in AC10
Summary
by MITRE • 06/05/2025
A vulnerability, which was classified as critical, was found in Tenda AC10 up to 15.03.06.47. This affects the function formSetPPTPServer of the file /goform/SetPptpServerCfg of the component HTTP Handler. The manipulation of the argument startIp/endIp leads to buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used.
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Analysis
by VulDB Data Team • 06/06/2025
This critical vulnerability exists in the Tenda AC10 router firmware version 15.03.06.47 and earlier, representing a significant security risk that allows remote code execution through a buffer overflow flaw in the HTTP handler component. The vulnerability specifically resides in the formSetPPTPServer function within the /goform/SetPptpServerCfg file, which processes user input without proper validation or bounds checking. The buffer overflow occurs when manipulating the startIp and endIp arguments, creating an opportunity for attackers to overwrite adjacent memory locations and potentially execute arbitrary code on the affected device. This flaw falls under CWE-121, which describes buffer overflow conditions where insufficient bounds checking allows attackers to write past the end of allocated buffer space. The vulnerability's remote exploitability means that attackers can trigger the buffer overflow through network-based attacks without requiring physical access to the device, making it particularly dangerous for network infrastructure devices. The attack surface is expanded by the fact that the exploit has been publicly disclosed, increasing the likelihood of real-world exploitation by malicious actors who may leverage techniques described in the attack pattern framework such as those categorized under ATT&CK technique T1210 for exploitation of remote services.
The operational impact of this vulnerability extends beyond simple denial of service or data compromise, as it allows for complete system compromise and potential lateral movement within networks. When exploited successfully, the buffer overflow could enable attackers to gain root access to the router's operating system, potentially allowing them to modify network configurations, redirect traffic through malicious proxies, or establish persistent backdoors for future access. The affected HTTP handler component suggests that the vulnerability could be exploited through standard web browser interactions, making it particularly dangerous for home and small office users who may not be aware of the security implications. Network administrators face significant risk as compromised routers can serve as entry points for broader network attacks, potentially enabling attackers to pivot to other devices within the local network. The severity classification as critical indicates that the vulnerability has a high probability of being exploited and could result in substantial damage to network security posture, particularly in environments where these routers are deployed without proper security monitoring or network segmentation.
Mitigation strategies for this vulnerability should include immediate firmware updates from Tenda to address the buffer overflow flaw, as well as network-level security controls to limit access to the affected router interfaces. Organizations should implement network segmentation to isolate critical systems from potentially compromised devices and deploy intrusion detection systems to monitor for exploitation attempts. The vulnerability highlights the importance of secure coding practices, particularly around input validation and buffer management, which aligns with industry standards such as those recommended in the OWASP Top Ten and NIST cybersecurity guidelines. Security teams should also consider implementing network access controls to restrict access to administrative interfaces and establish monitoring procedures for unusual network traffic patterns that might indicate exploitation attempts. Additionally, regular vulnerability assessments and penetration testing should be conducted to identify similar issues in other network devices and ensure that firmware updates are applied promptly. The public disclosure of the exploit means that organizations should prioritize remediation efforts and consider implementing temporary workarounds such as disabling unnecessary services or restricting remote administrative access until proper patches are deployed.