CVE-2019-9099

Name: CVE-2019-9099
Creator: NVD / NIST
Published: 2020-03-11T15:15:16.903+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 3.94%

Last modified Jun 17, 2026

CVE-2019-9099 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. An issue was discovered on Moxa MGate MB3170 and MB3270 devices before 4.1, MB3280 and MB3480 devices before 3.1, MB3660 devices before 2.3, and MB3180 devices before 2.1. A Buffer overflow in the built-in web server allows remote attackers to initiate DoS, and probably to execute arbitrary code (issue 1 of 2).. EPSS estimates a 3.94% chance of exploitation in the next 30 days.

Description

An issue was discovered on Moxa MGate MB3170 and MB3270 devices before 4.1, MB3280 and MB3480 devices before 3.1, MB3660 devices before 2.3, and MB3180 devices before 2.1. A Buffer overflow in the built-in web server allows remote attackers to initiate DoS, and probably to execute arbitrary code (issue 1 of 2).

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

3.94%

89.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-120

Affected Software

Vendor	Product	Versions
Moxa	Mb3170 Firmware	<= 4.0
Moxa	Mb3270 Firmware	<= 4.0
Moxa	Mb3180 Firmware	<= 2.0
Moxa	Mb3280 Firmware	<= 3.0
Moxa	Mb3480 Firmware	<= 3.0
Moxa	Mb3660 Firmware	<= 2.2

References

https://www.moxa.com/en/support/support/security-advisory/mb3710-3180-3270-3280-3480-3660-vulnerabilitiesVendor Advisory
https://www.us-cert.gov/ics/advisories/icsa-20-056-01Third Party Advisory, US Government Resource
https://www.moxa.com/en/support/support/security-advisory/mb3710-3180-3270-3280-3480-3660-vulnerabilitiesVendor Advisory
https://www.us-cert.gov/ics/advisories/icsa-20-056-01Third Party Advisory, US Government Resource

Timeline

Published: Mar 11, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-9099?

How severe is CVE-2019-9099?

CVE-2019-9099 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 3.94% probability of exploitation in the next 30 days.

How do I fix CVE-2019-9099?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-9099?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST