← Vulnerability feed

Vulnerability record · CVE-2022-40855 · published 23 September 2022

CVE-2022-40855: Tenda w20e firmware out-of-bounds write vulnerability

Tenda · W20e Firmware

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.

9.8 CVSS 3.1 Critical EPSS 14% · top 3.6% CWE-787 · Out-of-bounds write
9.8CVSS 3.1 base score
14%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/CPSeek/Router-vuls/blob/main/Tenda/W20E/formSetPortMapping.md ExploitThird Party Advisory
https://github.com/CPSeek/Router-vuls/blob/main/Tenda/W20E/formSetPortMapping.md ExploitThird Party Advisory

Track CVE-2022-40855 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2026-24110Tenda w20e firmware classic buffer overflow vulnerabilityAn issue was discovered in Tenda W20E V4.0br_V15.11.0.6. Attackers may send overly long `addDhcpRules` data. When these rules enter the `addDhcpRule`…EPSS 0.43%9.8CVE-2026-24112Tenda w20e firmware classic buffer overflow vulnerabilityAn issue was discovered in Tenda W20E V4.0br_V15.11.0.6. Attackers may exploit the vulnerability by specifying the value of `userInfo`. When `userInf…EPSS 0.53%9.8CVE-2026-24107Tenda w20e firmware code injection vulnerabilityAn issue was discovered in Tenda W20E V4.0br_V15.11.0.6. Failure to validate the value of `usbPartitionName`, which is directly used in `doSystemCmd`…EPSS 2.2%9.8CVE-2026-24108Tenda w20e firmware classic buffer overflow vulnerabilityAn issue was discovered in Tenda W20E V4.0br_V15.11.0.6. Attackers may exploit the vulnerability by controlling the value of `nptr`. When this value …EPSS 0.65%9.8CVE-2026-24109Tenda w20e firmware classic buffer overflow vulnerabilityAn issue was discovered in Tenda W20E V4.0br_V15.11.0.6. Attackers may exploit the vulnerability by controlling the value of `picName`. When this val…EPSS 0.65%9.8CVE-2026-24111Tenda w20e firmware classic buffer overflow vulnerabilityAn issue was discovered in Tenda W20E V4.0br_V15.11.0.6. Attackers may exploit the vulnerability by specifying the value of `userInfo`. When `userInf…EPSS 0.65%9.8CVE-2026-24113Tenda w20e firmware classic buffer overflow vulnerabilityAn issue was discovered in Tenda W20E V4.0br_V15.11.0.6. Attackers may exploit the vulnerability by controlling the value of `nptr`. When this value …EPSS 0.65%9.8CVE-2026-24114Tenda w20e firmware classic buffer overflow vulnerabilityAn issue was discovered in Tenda W20E V4.0br_V15.11.0.6. Failure to validate `pPortMapIndex` may lead to buffer overflows when using `strcpy`.EPSS 0.62%

Source: NIST National Vulnerability Database (record CVE-2022-40855), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.