Is CVE-2022-40855 actively exploited?

No active exploitation of CVE-2022-40855 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2022-40855 be exploited remotely?

Yes. CVE-2022-40855 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2022-40855?

CVE-2022-40855 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2022-40855

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

9.8

CVSS v3.1

Official Description

Tenda W20E router V15.11.0.6 contains a stack overflow in the function formSetPortMapping with post request 'goform/setPortMapping/'. This vulnerability allows attackers to cause a Denial of Service (DoS) or Remote Code Execution (RCE) via the portMappingServer, portMappingProtocol, portMappingWan, porMappingtInternal, and portMappingExternal parameters.

NVD Source

Risk Analysis

This stack overflow in the Tenda W20E router's port mapping function can result in a denial of service or remote code execution. The 9.8 CVSS score reflects the severity of this remotely exploitable flaw.

No public exploit is known, and it is not in the KEV catalog. It is remotely exploitable with low complexity.

Recommended Action

Apply the latest firmware update for the Tenda W20E to patch the port mapping function. Disable or restrict access to the web-based management interface.

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-2022-40855 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.