Is CVE-2020-8515 actively exploited?

CVE-2020-8515 has no public evidence of in-the-wild exploitation as of 2025-11-07.

What is the CVSS score for CVE-2020-8515?

CVE-2020-8515 has a CVSS score of 9.8 (CRITICAL severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

How do I patch CVE-2020-8515?

Patch guidance is available from draytek security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2020-8515.

Fix CVE-2020-8515 - CRITICAL draytek vigor2960 firmware

Q: Which products are affected by CVE-2020-8515?

5 products: draytek vigor2960 firmware, draytek vigor300b firmware, draytek vigor300b firmware, draytek vigor300b firmware, draytek vigor3900 firmware.

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.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Weaknesses: CWE-78 · OS Command Injection CWE-78 · OS Command Injection

Metadata

Primary Vendor: DRAYTEK
Published: 2/1/2020
Last Modified: 11/7/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

draytek : vigor2960_firmwaredraytek : vigor300b_firmwaredraytek : vigor300b_firmwaredraytek : vigor300b_firmwaredraytek : vigor3900_firmware

Remediation Guidance

Executive Summary

View on NIST NVD