# CVE-2020-8515: Multiple DrayTek Vigor Routers Web Management Page Vulnerability

Source: https://junglewise.ai/threats/cve-2020-8515-multiple-draytek-vigor-routers-web-management-page-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2021-11-03. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2020-8515 · Severity: critical · CVSS 9.8 · Exploited in the wild · Published 2021-11-03

DrayTek Vigor2960, Vigor3900, and Vigor300B routers are vulnerable to unauthenticated remote code execution as root. The flaw exists in the cgi-bin/mainfunction.cgi URI due to improper neutralization of shell metacharacters.

Vendors: [DrayTek](https://junglewise.ai/threats/vendors/draytek).

## Quick answers

**Is CVE-2020-8515 exploited in the wild?** Yes. CVE-2020-8515 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.

**How severe is CVE-2020-8515?** Critical severity, with a CVSS score of 9.8, published 3 November 2021.

**Which products and versions are affected?** DrayTek Vigor2960 1.3.1_Beta; DrayTek Vigor3900 1.4.4_Beta; DrayTek Vigor300B 1.3.3_Beta, 1.4.2.1_Beta, 1.4.4_Beta.

**Is there a fix for CVE-2020-8515?** A patch was published on 2020-02-10: Fixed in firmware version 1.5.1 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2020-8515 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2020-8515?** Check whether you run DrayTek Multiple Vigor Routers. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- DrayTek Vigor2960 1.3.1_Beta
- DrayTek Vigor3900 1.4.4_Beta
- DrayTek Vigor300B 1.3.3_Beta, 1.4.2.1_Beta, 1.4.4_Beta

## Timeline

- 2020-01-28: disclosed: Initial third-party disclosure via blog post
- 2021-11-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
- 2020-02-10: patched: Fixed in firmware version 1.5.1

## Related threats

- [DrayTek Multiple Vigor Routers OS Command Injection Vulnerability](https://junglewise.ai/threats/cve-2020-15415-draytek-multiple-vigor-routers-os-command-injection-vulnerability)