CVE-2026-5567
Published: 05 April 2026
Summary
CVE-2026-5567 is a high-severity Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119) vulnerability in Tenda M3 Firmware. Its CVSS base score is 7.4 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 45.6th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-16 (Memory Protection).
Deeper analysis
CVE-2026-5567 is a buffer overflow vulnerability affecting the Tenda M3 firmware version 1.0.0.10. The flaw resides in the setAdvPolicyData function within the /goform/setAdvPolicyData endpoint of the Destination Handler component. It is triggered by manipulating the policyType argument, as classified under CWE-119 and CWE-120. The vulnerability carries a CVSS v3.1 base score of 8.8, reflecting its high severity.
The vulnerability enables remote exploitation over the network with low attack complexity and requires low privileges, such as those of an authenticated user, with no user interaction needed. Successful exploitation can result in high impacts to confidentiality, integrity, and availability, potentially allowing arbitrary code execution or system compromise on the affected device.
Advisories documented on VulDB (vuln/355337) and a GitHub issue (Moxxkidd/CVE/issues/2) provide further details on the vulnerability, including a published exploit that may be used. The manufacturer's site (tenda.com.cn) is referenced, though specific patch or mitigation guidance is not detailed in the available information.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-19081
Vulnerability details
A flaw has been found in Tenda M3 1.0.0.10. This vulnerability affects the function setAdvPolicyData of the file /goform/setAdvPolicyData of the component Destination Handler. Executing a manipulation of the argument policyType can lead to buffer overflow. The attack can be…
more
executed remotely. The exploit has been published and may be used.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Buffer overflow in web form handler (/goform/setAdvPolicyData) enables remote exploitation of public-facing application for arbitrary code execution and system compromise.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly prevents buffer overflow by validating the policyType argument in the setAdvPolicyData function against defined bounds and formats.
Remediates the specific buffer overflow flaw in Tenda M3 firmware version 1.0.0.10 through timely identification, patching, and verification.
Implements memory safeguards like stack canaries, ASLR, and DEP to block arbitrary code execution from successful buffer overflow exploitation.