CVE-2026-15579

High

Description

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.

SeverityHigh

CVSS8.8

Exploit probability—

ProductTN-4500B Series

PublishedSep 18, 2026

First seenSep 18, 2026

Weakness typeCWE-787Out-of-bounds write

How to fix

Vendor advisories

moxa.com/en/support/product-support/security-advisory/mpsa-252620-cve-2026-15579-out-of-bounds-write-vulnerability-in-ethernet-switch

Affected products

Product	Affected versions	Fixed in
Moxa TN-4500B Series	1.0 ≤ v ≤ 2.0	—

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