CVE-2020-15415: DrayTek Multiple Vigor Routers OS Command Injection Vulnerability

Vulnerability summary

CVE-2020-15415 is a critical (CVSS 9.8) OS Command Injection vulnerability in DrayTek Multiple Vigor Routers. It is known to be exploited: CISA lists it, first on 30-09-2024. EPSS estimates a 84.48% chance of exploitation in the next 30 days, higher than 99.7% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 30-06-2020
   PublishedVulnerability first disclosed.
2. 30-09-2024
   Added to CISA KEVExploitedDrayTek Multiple Vigor Routers OS Command Injection Vulnerability
3. 21-10-2024
   CISA remediation dueDeadline passedApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
4. 21-10-2025
   Last modifiedVulnerability information updated.

Description

On DrayTek Vigor3900, Vigor2960, and Vigor300B devices before 1.5.1, cgi-bin/mainfunction.cgi/cvmcfgupload allows remote command execution via shell metacharacters in a filename when the text/x-python-script content type is used, a different issue than CVE-2020-14472.

• CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.