CVE-2026-41927Public exploitNetwork attack vector

Unauthenticated code execution via oversized CGI POST

Published May 4, 2026 · Updated May 4, 2026

Stack-based buffer overflow in WDR201A WiFi Extender firmware 1.02.0 and earlier allows remote attackers to execute code via CGI POST requests. The firewall.cgi and makeRequest.cgi main routines pass attacker-controlled Content-Length plus one to fgets() for a fixed 512-byte stack buffer. No authentication is required; oversized bodies reliably overwrite saved return addresses, while code execution is constrained by per-process ASLR and was demonstrated only once.

CVSS severity8.3
High
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in WDR201A WiFi Extender firmware 1.02.0 and earlier allows remote attackers to execute code via CGI POST requests. The firewall.cgi and makeRequest.cgi main routines pass attacker-controlled Content-Length plus one to fgets() for a fixed 512-byte stack buffer. No authentication is required; oversized bodies reliably overwrite saved return addresses, while code execution is constrained by per-process ASLR and was demonstrated only once.

The record

CVE
CVE-2026-41927
Published
May 4, 2026
Updated
May 4, 2026
Vendor
Shenzhen Yipu Commercial and Trading Co., Ltd
Product
WDR201A WiFi Extender
Classifications
CWE-121, T1190
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

8.3VulnCheckCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/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.

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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-121Stack-based Buffer Overflow
T1190Exploit Public-Facing Application

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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