CVE-2026-41926Public exploitNetwork attack vector

Unauthenticated command execution via firewall.cgi handlers

Published May 4, 2026 · Updated May 4, 2026

OS command injection in WDR201A WiFi Extender firmware 1.02 and earlier allows remote attackers to execute arbitrary shell commands. Five firewall.cgi handlers feed request values into shell-backed iptables commands; two omit filtering and three block only semicolons, so $() substitution remains executable. No authentication or user interaction is required, and injected values persist in NVRAM and execute again whenever firewall.cgi runs.

CVSS severity9.3
Critical
EPSS probability1.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in WDR201A WiFi Extender firmware 1.02 and earlier allows remote attackers to execute arbitrary shell commands. Five firewall.cgi handlers feed request values into shell-backed iptables commands; two omit filtering and three block only semicolons, so $() substitution remains executable. No authentication or user interaction is required, and injected values persist in NVRAM and execute again whenever firewall.cgi runs.

The record

CVE
CVE-2026-41926
Published
May 4, 2026
Updated
May 4, 2026
Vendor
Shenzhen Yipu Commercial and Trading Co., Ltd
Product
WDR201A WiFi Extender
Classifications
CWE-78, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 4, 2026CVE publishedPublication date reported by the CVE source.
  2. May 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=1.02

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Shenzhen Yipu Commercial and Trading Co., Ltd · WDR201A WiFi Extenderversion=0 <=1.02

Published CVSS scores

9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059.004Unix Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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