CVE-2020-8515 — Multiple DrayTek Vigor Routers Web Management Page 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 Vigor3900/296
Published
2020-02-01T12:36:59.000Z
Last modified
2025-10-21T23:35:52.845Z
CISA KEV — Actively Exploited
01What is 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.
02Affected products
| Vendor | Product | Versions |
|---|
| n | a / n/a | n/a |
03Active exploitation status
Yes — actively exploited. Added to the CISA KEV catalog on 2021-11-03. Ransomware use: Unknown.
04Recommended remediation
- Patch to a fixed version listed in the vendor advisory (see references below).
- Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
- Hunt historical logs for exploitation indicators — see Detection signatures below.
05Technical details
For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.
06Detection signatures
Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:
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07Related CVEs
No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.
08Timeline
- Published: 2020-02-01T12:36:59.000Z
- Last modified: 2025-10-21T23:35:52.845Z
- Added to CISA KEV: 2021-11-03
- BOD 22-01 due: 2022-05-03
09References
- 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…
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