OS Command Injection in Tenda G300-F Router Firmware
CVE-2026-25857

8.6HIGH

Key Information:

Vendor

Shenzhen Tenda Technology

Status
Tenda G300-f
Vendor
CVE Published:
7 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-25857?

The Tenda G300-F router's firmware vulnerabilities relate to the WAN diagnostic functionality, specifically in the formSetWanDiag process. This vulnerability allows remote attackers, with access to the management interface, to inject arbitrary shell commands through inadequate input validation in the system's command construction logic. Without proper safeguards, attackers can leverage this flaw to execute commands with management privileges, potentially compromising the device's security and integrity.

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Affected Version(s)

Tenda G300-F 0 <= 16.01.14.2

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-2026-25857 - Proof of Concept

References

https://blog.evan.lat/blog/cve-2026-25857/
technical-descriptionexploit
https://www.tendacn.com/material/show/736333682028613
product
https://www.vulncheck.com/advisories/tenda-g300-f-command...
third-party-advisory

CVSS V4

Score:
8.6
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

evan
JSON
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