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CVE-2026-25857: Tenda G300-F Command Injection via formSetWanDiag

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-02-07 · updated 2026-06-17
• Weakness: CWE-78

Description

Tenda G300-F router firmware version 16.01.14.2 and prior contain an OS command injection vulnerability in the WAN diagnostic functionality (formSetWanDiag). The implementation constructs a shell command that invokes curl and incorporates attacker-controlled input into the command line without adequate neutralization. As a result, a remote attacker with access to the affected management interface can inject additional shell syntax and execute arbitrary commands on the device with the privileges of the management process.

Affected products

• Shenzhen Tenda Technology Tenda G300-F: through 16.01.14.2

References

• https://blog.evan.lat/blog/cve-2026-25857/
• https://www.tendacn.com/material/show/736333682028613
• https://www.vulncheck.com/advisories/tenda-g300-f-command-injection-via-formsetwandiag

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