What’s Vulnerable › Vulnerabilities

CVE-2021-43118

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 34.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-03-29 · updated 2026-06-17
• Weakness: CWE-77

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.

Affected products

• DrayTek Vigor2960: 1.5.1.3
• DrayTek Vigor 300B: 1.5.1.3
• DrayTek Vigor3900 Firmware: 1.5.1.3

References

• https://gist.github.com/Cossack9989/6034c077f46e4f06d0992e9f2fae7f26
• https://gist.github.com/Cossack9989/6034c077f46e4f06d0992e9f2fae7f26

Get alerted when CVE-2021-43118 or the next vulnerability affects your stack