CVE-2020-8515 on CISA KEV

DrayTek Vigor2960 1.3.1_Beta, Vigor3900 1.4.4_Beta, and Vigor300B 1.3.3_Beta, 1.4.2.1_Beta, and 1.4.4_Beta devices allow remote code execution as root (without authentication) via shell metacharacters to the cgi-bin/mainfunction.cgi URI. This issue has been fixed in Vigor3900/296

01What CISA says about this vulnerability

DrayTek Vigor2960 1.3.1_Beta, Vigor3900 1.4.4_Beta, and Vigor300B 1.3.3_Beta, 1.4.2.1_Beta, and 1.4.4_Beta devices allow remote code execution as root (without authentication) via shell metacharacters to the cgi-bin/mainfunction.cgi URI. This issue has been fixed in Vigor3900/2960/300B v1.5.1.

02Required action — verbatim from CISA

Apply updates per vendor instructions.

03Notes & references

• sku11army.blogspot.com — https://sku11army.blogspot.com/2020/01/draytek-unauthenticated-rce-in-draytek.ht…
• www.draytek.com — https://www.draytek.com/about/security-advisory/vigor3900-/-vigor2960-/-vigor300…
• packetstormsecurity.com — http://packetstormsecurity.com/files/156979/DrayTek-Vigor2960-Vigor3900-Vigor300…

04SARA's analyst layer — why this matters

This vulnerability is currently on the CISA KEV list, which CISA only adds CVEs to when there is reliable evidence of active exploitation in the wild. For federal civilian agencies, BOD 22-01 requires remediation by the due date above. For everyone else, KEV is the strongest "patch immediately" signal you can get from public threat intel.

05Affected products (summary)

Vendor	Product	Versions
n	a / n/a	n/a

06Detection

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection:

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