CVE-2022-40868: tenda w20e_firmware Out-of-bounds Write
Modified
Published 23-09-2022Last modified 22-05-2025
Vulnerability summary
CVE-2022-40868 is a critical (CVSS 9.8) Out-of-bounds Write vulnerability in tenda w20e_firmware. EPSS estimates a 1.17% chance of exploitation in the next 30 days, higher than 67.2% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)EPSS score
1.17%
0%100%
Low · +0.03 pp in 30 daysKEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1github
Timeline
- 23-09-2022PublishedVulnerability first disclosed.
- 22-05-2025Last modifiedVulnerability information updated.
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 formDelDhcpRule with the request /goform/delDhcpRules/
CVSS metrics
2 scores · 2 sources · 1 versionCritical 9.8Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSourcesAll 2 agree
- NVDNIST9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
1.17%
Chance of exploitation in the next 30 days
Percentile
67%
Versus all other CVEs
30-day change
Increase +0.03 pp
From 1.15% on 22-09-2026
22-09-202622-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
1 foundRouter Vuls
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Tenda1 product
- w20e_firmware15.11.0.6
1 vendor · 1 product
References
1 links- github.com/CPSeek/Router-vuls/blob/main/Tenda/W20E/formDelDhcpRule.mdX Refsource MISCExploitThird Party Advisory