CVE-2026-25857 Tenda G300-F Command Injection via formSetWanDiag
Remote attackers can execute arbitrary commands on Tenda G300-F routers via the WAN diagnostic interface due to insufficient input sanitization.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-25857?
CVE-2026-25857 is a high-severity command injection vulnerability in Shenzhen Tenda Technology Tenda G300-F, published on 7 Feb 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official 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.
Weakness: CWE-78
Which versions are affected by CVE-2026-25857?
It affects 1 product.
Products include Tenda G300-F Firmware.
How do I fix CVE-2026-25857?
No fix has been published for CVE-2026-25857 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-25857 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-25857 exists.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-m35g-p77j-hqrh.