CVE-2026-2187
Published: 08 February 2026
Summary
CVE-2026-2187 is a high-severity Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119) vulnerability in Tenda Rx3 Firmware. Its CVSS base score is 7.4 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 47.6% of CVEs by exploit likelihood; 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-2026-2187 is a stack-based buffer overflow vulnerability affecting Tenda RX3 router firmware version 16.03.13.11. The flaw exists in the set_qosMib_list function of the /goform/formSetQosBand file, where manipulation of the argument list triggers the overflow. Published on 2026-02-08, it is associated with CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) and CWE-121 (Stack-based Buffer Overflow), earning a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).
Remote attackers with low privileges can exploit this vulnerability over the network with low complexity and no user interaction required. Successful exploitation grants high-impact access to confidentiality, integrity, and availability, enabling potential full system compromise on the affected router.
Advisories on VulDB (ctiid.344890, id.344890, submit.749721) and a GitHub issue (LX-66-LX/cve-new/issues/8) detail the vulnerability, noting that a public exploit is available for use. The Tenda manufacturer's site (tenda.com.cn) is referenced, though specific patch or mitigation guidance is not outlined in the provided sources.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-5763
Vulnerability details
A vulnerability was found in Tenda RX3 16.03.13.11. The affected element is the function set_qosMib_list of the file /goform/formSetQosBand. Performing a manipulation of the argument list results in stack-based buffer overflow. It is possible to initiate the attack remotely. The…
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exploit has been made public and could be used.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Stack-based buffer overflow in router web form (/goform/formSetQosBand) directly enables remote exploitation of a public-facing network device application, leading to RCE and full system compromise.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly prevents stack-based buffer overflow by validating argument list inputs to the set_qosMib_list function in /goform/formSetQosBand.
Protects against stack buffer overflow exploitation through memory safeguards like stack canaries and non-executable stacks.
Requires timely flaw remediation via firmware patching for the known buffer overflow vulnerability with public exploit.