Vulnerability identifier: #VU29335

Vulnerability risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-14473

CWE-ID: CWE-121

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Vigor 3900
Hardware solutions / Routers & switches, VoIP, GSM, etc
Vigor 2960
Hardware solutions / Routers & switches, VoIP, GSM, etc
Vigor 300B
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: DrayTek Corp.

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error. A remote unauthenticated attacker can trigger a stack-based buffer overflow and execute arbitrary code on the target system or perform a denial of service (DoS) attack.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Vigor 3900: 1.4.4 _ - 1.5.1

Vigor 2960: 1.3.1 _ - 1.5.1

Vigor 300B: 1.3.3 _ - 1.5.1

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External links
http://www.draytek.com/about/security-advisory/vigor3900-/-vigor2960-/-vigor300b-stack-based-buffer-overflow-vulnerability-(cve-2020-14473)

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.