CVE-2022-40855

Name: CVE-2022-40855
Creator: NVD / NIST
Published: 2022-09-23T15:15:14.473+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 13.49%

Last modified Jun 17, 2026

CVE-2022-40855 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 13.49% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

13.49%

96.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Tenda	W20e Firmware	15.11.0.6

References

https://github.com/CPSeek/Router-vuls/blob/main/Tenda/W20E/formSetPortMapping.mdExploit, Third Party Advisory
https://github.com/CPSeek/Router-vuls/blob/main/Tenda/W20E/formSetPortMapping.mdExploit, Third Party Advisory

Timeline

Published: Sep 23, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-40855?

How severe is CVE-2022-40855?

CVE-2022-40855 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 13.49% probability of exploitation in the next 30 days.

How do I fix CVE-2022-40855?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-40855?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST