CVE-2020-8515Multiple 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 Vigor3900/2960/300B v1.5.1.

9.8 CRITICALEPSS 99.99%⚡ Known Exploited (CISA KEV)NVD: Analyzed

Last updated: 2026-06-17 03:26 UTC

OverviewCVSS details

9.8CRITICALCVSS 3.1

Score source: NVD
NVD status: Analyzed
Published: Feb 1, 2020
Assigner: mitre

Affected

vigor2960 firmware (draytek)

Versions: 1.3.1 beta

+2 more products →

Exploitation

Public exploit: Yes · 1 reference
CISA KEV: Listed · Nov 3, 2021
KEV due date: May 3, 2022
Ransomware use: Unknown
SSVC: Exploitation active · Automatable yes · Impact total

EPSS · FIRST, scored Nov 8

99.99%chance of exploitation in 30 days

Higher than 99.98% of CVEs

CVSS 3.1 · NVD

9.8Critical

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

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

CVSS 2.0 · NVD

10.0High

AV:N/AC:L/Au:N/C:C/I:C/A:C

Attack vector: Network
Attack complexity: Low
Authentication: None
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

NVD status: Analyzed

Overview Affected Products References

NVD CVE.org

Overview

Severity

Score	Severity	Version	Vector String
9.8	CRITICAL	3.1NVD	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10.0	HIGH	2.0NVD	AV:N/AC:L/Au:N/C:C/I:C/A:C

CISA required action

⚡ Known exploited · remediation due May 3, 2022

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Details

CVE ID: CVE-2020-8515
Status: Analyzed
Assigner (CNA): mitre
Published: Feb 1, 2020
Last modified: 2026-06-17 03:26 UTC
Weaknesses: CWE-78

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-09 10:16 UTC.