A high-severity vulnerability, identified as CVE-2026-7057, exists in Tenda F456 version 1.0.0.5. This vulnerability allows for a buffer overflow due to improper handling of the argument 'funcname/funcpara1' in the file /goform/setcfm of the component httpd. The flaw can be exploited remotely, making it critical for organizations to address it urgently.
The CVSS base score for this vulnerability is 7.4, classified as high severity. The low attack complexity and the requirement for only low privileges further enhance the risk to organizations, as attackers may exploit this vulnerability without significant barriers. Immediate action is necessary to mitigate the potential impact.
Risk to organizations includes unauthorized access to sensitive data and potential system compromise, highlighting the urgency of remediation. Organizations should prioritize patching immediately.
The vulnerability has been acknowledged, and although proof-of-concept exploits have been published, no known exploits are currently confirmed in the wild. However, the existence of published exploits indicates that attackers may leverage this vulnerability.
Vulnerability Details
The flaw described in CVE-2026-7057 arises from improper argument handling within a specific function in the Tenda F456 router's firmware. The vulnerability falls under the CWE classifications CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) and CWE-120 (Buffer Copy without Checking Size of Input). Published on April 26, 2026, this vulnerability should be addressed promptly to prevent exploitation.
Technical Analysis
The root cause of this vulnerability is a buffer overflow that occurs when the affected function manipulates the arguments without adequate validation. Attackers can exploit this vulnerability via a network, utilizing low privileges and without requiring user interaction. The potential impact includes high confidentiality, integrity, and availability risks due to the nature of the overflow, which could lead to arbitrary code execution or denial of service.
Risk & Impact Analysis
The risks associated with this vulnerability are significant, as it could allow attackers to gain complete control over affected devices. The blast radius is extensive, given the remote exploitability and the number of devices that may be affected by this vulnerability. Organizations should assess their exposure and prioritize remediation efforts based on the high CVSS score.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected version is Tenda F456 1.0.0.5. All versions prior to vendor patch are vulnerable.
Mitigation & Remediation
Organizations should prioritize updating their Tenda F456 devices to the latest firmware version to remediate this vulnerability. If a patch is not yet available, consider implementing network controls to restrict access to vulnerable components. Continuous monitoring of network traffic and potential behavioral anomalies is also recommended.
Detection Guidance
Monitor logs for any unusual activity related to the affected components. Look for signs of unexpected access patterns or known indicators of compromise associated with buffer overflow attacks.
AppSecure Threat Intelligence Insight
The discovery of CVE-2026-7057 highlights ongoing vulnerabilities in consumer networking devices, emphasizing the need for robust security practices in firmware development. Security teams should prioritize regular vulnerability assessments and consider engaging in penetration testing to identify similar weaknesses. Additionally, organizations should review their device management policies to ensure timely updates and patches are applied.
For more insights on vulnerability management, refer to our comprehensive vulnerability management program design blog. Understanding the patterns and trends in vulnerabilities can aid in proactive defense strategies.
Finally, to stay ahead of potential threats, consider implementing a penetration testing methodology framework that aligns with your organizational needs.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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