CVE-2020-26728 Command injection in n/a

Critical 9.8 Published 11 Feb 2022 Updated 4 Aug 2024

Remote attackers can execute arbitrary code on Tenda AC9 routers by injecting shell metacharacters into the guestuser field via a POST request.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2020-26728?

CVE-2020-26728 is a critical command injection vulnerability in Tenda Ac9 Firmware, published on 11 Feb 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability was discovered in Tenda AC9 v3.0 V15.03.06.42_multi and Tenda AC9 V1.0 V15.03.05.19(6318)_CN which allows for remote code execution via shell metacharacters in the guestuser field to the __fastcall function with a POST request.

Which versions are affected by CVE-2020-26728?

It affects 1 product.

Products include Tenda Ac9 Firmware.

How do I fix CVE-2020-26728?

No fix has been published for CVE-2020-26728 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-2020-26728 being exploited?

There is no known exploitation of CVE-2020-26728 in the wild and no public exploit code.

All Tenda Ac9 Firmware vulnerabilities

Sources

Also known as GHSA-586v-26wc-h2mw.