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Known exploited · DrayTek

CVE-2024-12987: DrayTek Vigor Routers OS Command Injection Vulnerability

What it is

DrayTek Vigor2960, Vigor300B, and Vigor3900 routers contain an OS command injection vulnerability due to an unknown function of the file /cgi-bin/mainfunction.cgi/apmcfgupload of the component web management interface.

Added May 15, 2025Due June 5, 2025CISA KEV catalog 2026.10.01

Vendor
DrayTek
Product
Vigor Routers
Added to KEV
May 15, 2025
CISA due date
June 5, 2025
Ransomware use
Unknown

What CISA requires

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Forensic triage

No

What to do now

  1. Find every instance of Vigor Routers you run, including the forgotten ones, and check its version against the vendor advisory.
  2. Apply the vendor's fix or mitigation, before June 5, 2025 if you are bound by CISA's deadline, sooner if it faces the internet.
  3. Assume it was tried against you already: look for signs of exploitation from the date it was added, not from the day you patched.
  4. Until every instance is patched, block the attack at the edge: a WAF in blocking mode stops OS command injection payloads, including Shellshock.

References

CVE-2024-12987 in the National Vulnerability Database

The Dome

Block it at the edge while you patch

The Dome's WAF runs the OWASP Core Rule Set in blocking mode and stops OS command injection payloads, including Shellshock before they reach your application.

See the Dome

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Source: CISA Known Exploited Vulnerabilities Catalog (public domain), catalog version 2026.10.01.