Home/CVE/Multiple DrayTek Vigor Routers Web Management Page Vulnerability
CVE

CVE-2020-8515

Multiple 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.

CRITICAL · CVSS 9.8 ⚠ CISA KEV EPSS 0.94318
Act now
  • Listed on CISA KEV (known exploited in the wild)
  • SSVC exploitation status: active
  • EPSS ≥ 0.50 - high probability of exploitation in the next 30 days
  • EPSS percentile: top 0% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬢

Required Remediation

Apply updates per vendor instructions.

⬡

Weakness Classification

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
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Affected Products & Versions

3
draytek vigor2960 firmwareall versions
draytek vigor300b firmwareall versions
draytek vigor3900 firmwareall versions
⚠

Public Exploits & PoCs

3
remoteMultiple DrayTek Products - Pre-authentication Remote Root Code Execution2020-03-30
nucleiDrayTek - Remote Code Executioncritical
pocpacketstormsecurity.com · DrayTek-Vigor2960-Vigor3900-Vigor300B-Remote-Command-Exec...packetstormsecurity.com
◈

Detection Rules (IDS/IPS)

4
et-openET EXPLOIT Multiple DrayTek Products Pre-authentication Remote RCE Outbound (CVE-2020-8515) M1attempted-admin
et-openET EXPLOIT Multiple DrayTek Products Pre-authentication Remote RCE Inbound (CVE-2020-8515) M1attempted-admin
et-openET EXPLOIT Multiple DrayTek Products Pre-authentication Remote RCE Outbound (CVE-2020-8515) M2attempted-admin
et-openET EXPLOIT Multiple DrayTek Products Pre-authentication Remote RCE Inbound (CVE-2020-8515) M2attempted-admin
Open rulesets (ET Open, Snort Community, abuse.ch) link to source. Commercial rulesets are reference-only.
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Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD01 Feb 2020 · 01:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
active
Automatable
yes
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

1
cisaKEV-CVE-2020-8515
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://sku11army.blogspot.com/2020/01/draytek-unauthenticated-rce-in-draytek.htmlPermissions RequiredThird 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
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