CVE-2021-32976

Name: CVE-2021-32976
Creator: NVD / NIST
Published: 2022-04-01T23:15:10.083+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.62%

Last modified Jun 17, 2026

CVE-2021-32976 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Five buffer overflows in the built-in web server in Moxa NPort IAW5000A-I/O series firmware version 2.2 or earlier may allow a remote attacker to initiate a denial-of-service attack and execute arbitrary code.. EPSS estimates a 2.62% chance of exploitation in the next 30 days.

Description

Five buffer overflows in the built-in web server in Moxa NPort IAW5000A-I/O series firmware version 2.2 or earlier may allow a remote attacker to initiate a denial-of-service attack and execute arbitrary code.

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

2.62%

83.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Moxa	Nport Iaw5150a-6i\/O Firmware	<= 2.2
Moxa	Nport Iaw5150a-12i\/O Firmware	<= 2.2
Moxa	Nport Iaw5250a-6i\/O Firmware	<= 2.2
Moxa	Nport Iaw5250a-12i\/O Firmware	<= 2.2

References

https://www.cisa.gov/uscert/ics/advisories/icsa-21-187-01Mitigation, Third Party Advisory, US Government Resource
https://www.moxa.com/en/support/product-support/security-advisory/nport-iaw5000a-io-serial-device-server-vulnerabilitiesVendor Advisory
https://www.cisa.gov/uscert/ics/advisories/icsa-21-187-01Mitigation, Third Party Advisory, US Government Resource
https://www.moxa.com/en/support/product-support/security-advisory/nport-iaw5000a-io-serial-device-server-vulnerabilitiesVendor Advisory

Timeline

Published: Apr 1, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-32976?

How severe is CVE-2021-32976?

CVE-2021-32976 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.62% probability of exploitation in the next 30 days.

How do I fix CVE-2021-32976?

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-2021-32976?

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

Scan your code now

Source: NVD / NIST