Improper validation of integrity check value in TN-5900 - CVE-2021-46559

Vulnerability identifier: #VU60349

CSH Severity: Medium

CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-46559

CWE-ID: CWE-354

Exploitation vector: Remote access

Exploit availability: No public exploit available

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.

TN-5900

Install updates from vendor's website.

• https://www.moxa.com/en/support/product-support/security-advisory/tn-5900-secure-routers-vulnerabilities

• Multiple vulnerabilities in Moxa TN-5900