CVE-2021-43118: draytek vigor2960 Command Injection

Vulnerability summary

CVE-2021-43118 is a critical (CVSS 9.8) Command Injection vulnerability in draytek vigor2960. EPSS estimates a 34.84% chance of exploitation in the next 30 days, higher than 98.4% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 29-03-2022
   PublishedVulnerability first disclosed.
2. 04-08-2024
   Last modifiedVulnerability information updated.

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.

• CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.