CVE-2026-15579

Published Sep 18, 2026 CVSS 4.0 · 8.8 High EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Solution

Refer to Moxa's security advisory: https://www.moxa.com/en/support/product-support/security-advisory/mpsa-252620-cve-2026-15579-out-of-bounds-write-vulnerability-in-ethernet-switch

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Title Out‑of‑bounds write in Moxa TN‑4500B Ethernet switch username field leading to DoS
Type Values Removed Values Added
Title Out‑of‑bounds write in Moxa TN‑4500B Ethernet switch username field leading to DoS
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
First Time appeared Moxa
Moxa tn-4500b Series
Weaknesses CWE-787
CPEs cpe:2.3:a:moxa:tn-4500b_series:*:*:*:*:*:*:*:*
cpe:2.3:a:moxa:tn-4500b_series:2.1:*:*:*:*:*:*:*
Vendors & Products Moxa
Moxa tn-4500b Series
References
Metrics cvssV4_0

{'score': 8.8, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Moxa
Published
Updated
Sep 18, 2026, 10:39 AM
Reserved
Jul 13, 2026, 9:51 AM
Status
Awaiting Analysis
Published
Sep 18, 2026, 10:17 AM
Modified
Sep 18, 2026, 7:05 PM