CVE-2021-43118 Command injection in n/a

What is CVE-2021-43118?

CVE-2021-43118 is a critical command injection vulnerability in n/a, published on 29 Mar 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A Remote Command Injection vulnerability exists in DrayTek Vigor 2960 1.5.1.3, DrayTek Vigor 3900 1.5.1.3, and DrayTek Vigor 300B 1.5.1.3 via a crafted HTTP message containing malformed QUERY STRING in mainfunction.cgi, which could let a remote malicious user execute arbitrary code.

Weakness: CWE-77

Which versions are affected by CVE-2021-43118?

It affects 3 products.

Products include Draytek Vigor2960 Firmware, Draytek Vigor300b Firmware, Draytek Vigor3900 Firmware.

How do I fix CVE-2021-43118?

No fix has been published for CVE-2021-43118 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-2021-43118 being exploited?

There is no known exploitation of CVE-2021-43118 in the wild and no public exploit code.

Other vulnerabilities in n/a

• CVE-2020-15415 DrayTek Multiple Vigor Routers OS Command Injection Exploited Critical 9.8
• CVE-2020-8515 Multiple DrayTek Vigor Routers Web Management Page Exploited Critical 9.8
• CVE-2024-12987 DrayTek Vigor Routers OS Command Injection Exploited Medium 6.9
• CVE-2021-42911 Other in n/a Critical 9.8
• CVE-2020-14472 Command injection in n/a Critical 9.8

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-3q87-6fcw-7mj7.