CVE-2025-52221 Tenda CVE debrief

Who should care

Network administrators and security teams responsible for Tenda AC6 devices should prioritize patching this vulnerability to prevent potential exploitation. Additionally, security teams should review compensating controls for exposed systems while remediation is scheduled and verified. They should also check relevant monitoring, detection, and logs for exposed assets that need extra review.

Technical summary

The vulnerability exists in the formSetCfm function of Tenda AC6 15.03.05.16_multi. The funcname, funcpara1, and funcpara2 parameters are susceptible to a Buffer Overflow attack, allowing an attacker to execute arbitrary code remotely. The CVSS vector is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, indicating a high impact on confidentiality, integrity, and availability. The vulnerability is related to CWE-787 and CWE-120. To mitigate this vulnerability, network administrators and security teams should apply the vendor-provided patch or update to a fixed version of the firmware.

Defensive priority

High

Recommended defensive actions

• Apply the vendor-provided patch or update to a fixed version of the firmware.
• Implement network segmentation to limit the attack surface.
• Monitor network traffic for suspicious activity.
• Conduct regular vulnerability assessments and penetration testing.
• Consider implementing compensating controls, such as Web Application Firewalls (WAFs).
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Evidence notes

The CVE record was published on 2026-04-08T18:24:51.257Z and last modified on 2026-07-25T10:10:00.167Z. The NVD entry is currently Analyzed. The vulnerability is related to CWE-787 and CWE-120. Evidence from the CVE record and NVD entry indicates a critical Buffer Overflow vulnerability in the formSetCfm function of Tenda AC6 15.03.05.16_multi. The funcname, funcpara1, and funcpara2 parameters are susceptible to a Buffer Overflow attack, allowing an attacker to execute arbitrary code remotely. Network administrators and security teams should verify the affected product deployments and review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.