CVE-2020-8515

Name: CVE-2020-8515
Creator: NVD / NIST
Published: 2020-02-01T13:15:12.623+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10Actively ExploitedEPSS 99.99%

Last modified Jun 17, 2026

CVE-2020-8515 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. CISA has confirmed active exploitation in the wild. EPSS estimates a 99.99% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

99.99%

100.0th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by May 3, 2022.

Weakness Enumeration

Affected Software

Vendor	Product	Versions	Update
Draytek	Vigor2960 Firmware	1.3.1	Beta
Draytek	Vigor300b Firmware	1.3.3	Beta
Draytek	Vigor300b Firmware	1.4.2.1	Beta
Draytek	Vigor300b Firmware	1.4.4	Beta
Draytek	Vigor3900 Firmware	1.4.4	Beta

References

http://packetstormsecurity.com/files/156979/DrayTek-Vigor2960-Vigor3900-Vigor300B-Remote-Command-Execution.htmlExploit, Third Party Advisory, VDB Entry
https://sku11army.blogspot.com/2020/01/draytek-unauthenticated-rce-in-draytek.htmlPermissions Required, Third Party Advisory
https://www.draytek.com/about/security-advisory/vigor3900-/-vigor2960-/-vigor300b-router-web-management-page-vulnerability-%28cve-2020-8515%29/Vendor Advisory
http://packetstormsecurity.com/files/156979/DrayTek-Vigor2960-Vigor3900-Vigor300B-Remote-Command-Execution.htmlExploit, Third Party Advisory, VDB Entry
https://sku11army.blogspot.com/2020/01/draytek-unauthenticated-rce-in-draytek.htmlPermissions Required, Third Party Advisory
https://www.draytek.com/about/security-advisory/vigor3900-/-vigor2960-/-vigor300b-router-web-management-page-vulnerability-%28cve-2020-8515%29/Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-8515US Government Resource

Timeline

Published: Feb 1, 2020
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2020-8515?

How severe is CVE-2020-8515?

CVE-2020-8515 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 99.99% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2020-8515?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-8515?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST