Vulnerability identifier: #VU60349

Vulnerability risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-46559

CWE-ID: CWE-354

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
TN-5900
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: Moxa

Description
The vulnerability allows a remote attacker to bypass integrity checks.

The vulnerability exists due to a weak algorithm. A remote authenticated attacker can upload abritrary code in a crafted firmware image simply by replacing a CRC value in the image header.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

TN-5900: 3.1.0

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External links
http://www.moxa.com/en/support/product-support/security-advisory/tn-5900-secure-routers-vulnerabilities

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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