Stack-based Buffer Overflow Vulnerability in Tenda CH22 Router
CVE-2026-5204

8.7HIGH

Key Information:

Vendor

Tenda
Status
Ch22
Vendor
CVE Published:
31 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-5204?

A buffer overflow vulnerability exists in the parameter handler of the Tenda CH22 router, specifically within the formWebTypeLibrary function accessed via the /goform/webtypelibrary endpoint. An attacker can exploit this vulnerability remotely by manipulating the webSiteId argument, potentially allowing for arbitrary code execution. This issue has been publicly disclosed and highlights the importance of securing network devices against improper input validation.

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Affected Version(s)

CH22 1.0.0.1

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-5204 - Proof of Concept

References

https://vuldb.com/vuln/354332
vdb-entrytechnical-description
https://vuldb.com/vuln/354332/cti
signaturepermissions-required
https://vuldb.com/submit/780209
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

LtzHust2 (VulDB User)
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