9.8

CVE-2022-40855: tenda w20e_firmware Out-of-bounds Write

Modified
Published 23-09-2022Last modified 22-05-2025

Vulnerability summary

CVE-2022-40855 is a critical (CVSS 9.8) Out-of-bounds Write vulnerability in tenda w20e_firmware. EPSS estimates a 14.07% chance of exploitation in the next 30 days, higher than 96.5% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
14.07%
0%100%
Medium · +0.31 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1github

Timeline

  1. 23-09-2022
    PublishedVulnerability first disclosed.
  2. 22-05-2025
    Last modifiedVulnerability information updated.

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 metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

14.07%

Chance of exploitation in the next 30 days

Percentile

97%

Versus all other CVEs

30-day change

Increase +0.31 pp

From 13.76% on 22-09-2026

22-09-202622-10-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found
  • githubUnverified

    Router Vuls

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Tenda1 product

1 vendor · 1 product

References

1 links