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CVE-2020-8515

9.8, critical Known exploited

Multiple DrayTek Vigor Routers Web Management Page Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab) CISA KEV catalogue (opens in a new tab)
CVSS
9.8, critical critical CVSS v3.1
EPSS, next 30 days
100% higher than 99.9% of scored CVEs
Exploitation
Confirmed in the wild
Published
1 Feb 20206 years ago

Known exploited

CISA added this to the Known Exploited Vulnerabilities Catalog on 3 Nov 2021. US federal agencies had to remediate by 3 May 2022, a deadline that has passed.

Required action. Apply updates per vendor instructions.

Description

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.

Details

Vendor
DrayTek
Product
Vigor2960 Firmware
Weakness
CWE-78 (opens in a new tab)
Status
Analyzed
Updated
17 Jun 2026
Assigner
cve@mitre.org

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References 4

Exploit code 1

Advisories 2

Other references 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other DrayTek CVEs

Every DrayTek CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2024-12987 DrayTek Vigor Routers OS Command Injection Vulnerability KEV EPSS 98% 9.8, critical
  • CVE-2021-20123 Draytek VigorConnect Path Traversal Vulnerability KEV EPSS 90% 7.5, high
  • CVE-2021-20124 Draytek VigorConnect Path Traversal Vulnerability KEV EPSS 96% 7.5, high
  • CVE-2020-15415 DrayTek Multiple Vigor Routers OS Command Injection Vulnerability KEV EPSS 84% 9.8, critical

Beyond this page

Is CVE-2020-8515 in your network?

This page tells you how dangerous CVE-2020-8515 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

CVE-2020-8515 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.

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    Find it before attackers do

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  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.