CVE-2020-6989

In Moxa PT-7528 series firmware, Version 4.0 or lower, and PT-7828 series firmware, Version 3.9...

9.8 Critical

In Moxa PT-7528 series firmware, Version 4.0 or lower, and PT-7828 series firmware, Version 3.9 or lower, a buffer overflow in the web server allows remote attackers to cause a denial-of-service condition or execute arbitrary code.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

3.50%Up 2.5 points since Apr 14, 2021

What each source reports

NVD Score used 9.8

Record: CVE-2020-6989
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness: CWE-121, CWE-787
Updated: 2026-11-02

CVE List No score

Record: CVE-2020-6989
Weakness: CWE-121
Updated: 2026-11-02

EUVDEUVD-2020-28129 No score

Record: EUVD-2020-28129
Updated: 2026-11-03

GitHub AdvisoriesGHSA-f3pg-xh2r-fcrw No score

In Moxa PT-7528 series firmware, Version 4.0 or lower, and PT-7828 series firmware, Version 3.9...

Record: GHSA-f3pg-xh2r-fcrw
Updated: 2026-11-02

Affected products

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History

History
Recorded	Changed	Sources
Nov 10, 2026	facts
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-6989 is a critical vulnerability (CVSS 9.8) in Moxa Pt-7528-12msc-12tx-4gsfp-hv-hv Firmware, published March 24, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.50%, the 89th percentile. No source names a fixed version.