CVE-2026-3275 in F453
Summary
by MITRE • 02/27/2026
A weakness has been identified in Tenda F453 1.0.0.3. This affects the function fromAddressNat of the file /goform/addressNat of the component httpd. Executing a manipulation of the argument entrys can lead to buffer overflow. The attack may be performed from remote. The exploit has been made available to the public and could be used for attacks.
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Analysis
by VulDB Data Team • 05/29/2026
The vulnerability in Tenda F453 1.0.0.3 represents a critical buffer overflow weakness that resides within the httpd web server component of the device's firmware. This specific flaw manifests in the function fromAddressNat located within the /goform/addressNat endpoint, which serves as a web form handler for network address translation configurations. The vulnerability stems from inadequate input validation and bounds checking when processing the entrys argument parameter, creating an exploitable condition that allows attackers to manipulate memory allocation through crafted malicious input sequences. The attack vector is particularly concerning as it operates over the network without requiring physical access or authentication, making it a remote code execution vulnerability that could be leveraged by threat actors with minimal privileges.
The technical implementation of this buffer overflow vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The weakness in the fromAddressNat function demonstrates poor input sanitization practices where user-provided data from the entrys parameter is directly processed without proper length validation or memory boundary enforcement. This creates an opportunity for attackers to overflow the allocated buffer space and potentially overwrite critical program execution elements such as return addresses, function pointers, or other control flow data structures. The exploitation of this vulnerability could enable an attacker to execute arbitrary code on the device with the privileges of the httpd process, which typically runs with elevated system permissions.
The operational impact of this vulnerability extends beyond simple remote code execution, as it could enable attackers to gain persistent access to the network infrastructure. Once exploited, the vulnerability could allow attackers to modify network routing configurations, redirect traffic through malicious servers, or establish backdoor access points that persist across device reboots. The availability of public exploits for this vulnerability significantly amplifies the risk, as it removes the requirement for advanced technical skills or custom development. This makes the device particularly vulnerable to automated attacks and large-scale exploitation campaigns. The attack surface is further expanded by the fact that the vulnerability exists in a web-based administrative interface, meaning that any device with the affected firmware version could be compromised simply through web browser access.
Mitigation strategies for this vulnerability should include immediate firmware updates from Tenda to address the buffer overflow condition through proper input validation and memory bounds checking. Network administrators should implement network segmentation and access controls to limit exposure of these devices to untrusted networks, while also considering the deployment of intrusion detection systems that can identify exploitation attempts targeting the specific vulnerable endpoint. The implementation of web application firewalls with rules specifically designed to block malformed requests to the /goform/addressNat endpoint can provide additional protection layers. Organizations should also conduct thorough vulnerability assessments to identify other potentially affected devices within their network infrastructure and ensure that all firmware versions are regularly updated according to vendor security advisories. This vulnerability highlights the importance of secure coding practices and proper input validation in embedded web server implementations, aligning with ATT&CK technique T1059.007 for command and script injection attacks that could be facilitated through this buffer overflow condition.