Remote Code Execution Vulnerability in DrayTek Vigor Series Routers
CVE-2020-8515

9.8CRITICAL

Key Information:

Vendor

Draytek
Status
Vigor2960 Firmware
Vendor
CVE Published:
1 February 2020

Badges

👾 Exploit Exists🟡 Public PoC🟣 EPSS 94%🦅 CISA Reported

What is CVE-2020-8515?

DrayTek's Vigor2960, Vigor3900, and Vigor300B routers contain a serious vulnerability that allows unauthorized remote code execution. This flaw arises when users access the cgi-bin/mainfunction.cgi URI with shell metacharacters, permitting attackers to execute arbitrary commands with root privileges without any authentication. Users are advised to update their devices to version 1.5.1 or later to mitigate this security risk.

CISA has reported CVE-2020-8515

CISA provides regional cyber and physical services to support security and resilience across the United States. CISA monitor the most dangerious vulnerabilities and have identifed CVE-2020-8515 as being exploited but is not known by the CISA to be used in ransomware campaigns. This is subject to change at pace

The CISA's recommendation is: Apply updates per vendor instructions.

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2020-8515-PoC
Created by imjdl

CVE-2020-8515
Created by darrenmartyn

nmap_draytek_rce
Created by truerandom

References

https://sku11army.blogspot.com/2020/01/draytek-unauthenti...
x_refsource_MISC
https://www.draytek.com/about/security-advisory/vigor3900...
x_refsource_MISC
http://packetstormsecurity.com/files/156979/DrayTek-Vigor...
x_refsource_MISC

EPSS Score

94% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🦅

    CISA Reported

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.