CVE-2025-7807 in FH451
Summary
by MITRE • 07/19/2025
A vulnerability, which was classified as critical, has been found in Tenda FH451 1.0.0.9. This issue affects the function fromSafeUrlFilter of the file /goform/SafeUrlFilter. The manipulation of the argument Go/page leads to stack-based buffer overflow. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used.
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Analysis
by VulDB Data Team • 07/24/2025
The vulnerability identified as CVE-2025-7807 represents a critical stack-based buffer overflow in the Tenda FH451 router firmware version 1.0.0.9. This flaw resides within the fromSafeUrlFilter function located in the /goform/SafeUrlFilter file path, making it a significant target for remote exploitation. The vulnerability specifically manifests when processing the Go/page argument, which allows attackers to manipulate input parameters in a manner that exceeds the allocated buffer space on the stack. The stack-based nature of this overflow means that malicious input can overwrite adjacent memory locations, potentially leading to arbitrary code execution or system crashes. Given that the attack vector is remote and the exploit has been publicly disclosed, this vulnerability poses an immediate threat to affected devices and networks.
The technical implementation of this vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking allows attackers to write beyond the allocated buffer space. The attack surface is particularly concerning as it involves a web-based interface function that handles user input from HTTP requests, making it accessible through standard network protocols. The exploitation process likely involves crafting a malicious HTTP request containing an oversized payload in the Go/page parameter, which when processed by the vulnerable function causes the stack to overflow and potentially redirect program execution to attacker-controlled code. This type of vulnerability is particularly dangerous in networked devices as it can be exploited without requiring physical access or authentication.
From an operational perspective, the impact of CVE-2025-7807 extends beyond simple denial of service scenarios to potentially enable full system compromise. The remote exploit capability means that attackers can target these devices from anywhere on the internet, making them attractive targets for botnet recruitment and advanced persistent threats. The affected Tenda FH451 routers operate as network infrastructure devices, meaning successful exploitation could allow attackers to gain complete control over network traffic filtering, potentially enabling man-in-the-middle attacks, data interception, or redirection of network requests to malicious destinations. The fact that this exploit has been publicly disclosed significantly increases the risk to organizations and individuals who have not yet applied patches or updates to their affected systems.
Security mitigation strategies for CVE-2025-7807 should prioritize immediate firmware updates from Tenda, as this represents the most effective defense against the known exploit. Organizations should also implement network segmentation to isolate affected devices from critical systems, deploy intrusion detection systems to monitor for exploitation attempts, and consider disabling unnecessary web management interfaces until patches are applied. The vulnerability's classification as critical according to industry standards indicates that immediate action is required, as the combination of remote exploitability, public disclosure, and the nature of the buffer overflow creates a high-risk scenario. Network administrators should also consider implementing firewall rules that restrict access to the affected web interface from untrusted networks, and monitor for suspicious traffic patterns that might indicate exploitation attempts. Additionally, the ATT&CK framework categorizes this type of vulnerability under T1210 - Exploitation of Remote Services, emphasizing the need for comprehensive network monitoring and access control measures to prevent successful exploitation attempts.