CVE-2026-15579: Moxa Tn-4500b Series

High severity, CVSS 8.8. EPSS: 0.4% chance of exploitation in the next 30 days.

An out-of-bounds write vulnerability exists in some of the Ethernet switches because of improper validation of the username field length during Web login processing. This may allow a remote attacker to submit a specially crafted overly long input, triggering a buffer overflow that can cause the authentication process to crash and result in a Denial of Service (DoS) attack.

Affected products

• Moxa Tn-4500b Series: from 1.0, up to and including 2.0

Published 2026-09-18. Last modified 2026-09-18.