CVE-2021-42911 Other in n/a

What is CVE-2021-42911?

CVE-2021-42911 is a critical 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 Format String 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 in the mainfunction.cgi file via a crafted HTTP message containing malformed QUERY STRING, which could let a remote malicious user execute arbitrary code.

Weakness: CWE-134

Which versions are affected by CVE-2021-42911?

It affects 3 products.

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

How do I fix CVE-2021-42911?

No fix has been published for CVE-2021-42911 yet. Limit exposure of the affected software until one is available.

Is CVE-2021-42911 being exploited?

There is no known exploitation of CVE-2021-42911 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-2021-43118 Command injection 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-436r-9cvq-hjq5.