Is CVE-2022-40866 actively exploited?

No active exploitation of CVE-2022-40866 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2022-40866 be exploited remotely?

Yes. CVE-2022-40866 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2022-40866?

CVE-2022-40866 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2022-40866

CWE-787Published: September 23, 2022· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

Tenda W20E router V15.11.0.6 (US_W20EV4.0br_V15.11.0.6(1068_1546_841)_CN_TDC) contains a stack overflow vulnerability in the function formSetDebugCfg with request /goform/setDebugCfg/

NVD Source

Risk Analysis

The Tenda W20E router is susceptible to a stack overflow in its debug configuration function, which could be leveraged for remote code execution. Given the 9.8 CVSS score, this is a critical security concern.

There is no public exploit known, and it is not in the KEV catalog. The vulnerability is remotely exploitable.

Recommended Action

Update the Tenda W20E firmware to a version that fixes the stack overflow in formSetDebugCfg. Ensure the device management interface is not exposed to the public internet.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2022-40866 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

From a weakness classification perspective (CWE-787): Out-of-bounds write vulnerabilities can lead to data corruption, crashes, or arbitrary code execution.