CVE-2020-12739

Name: CVE-2020-12739
Creator: NVD / NIST
Published: 2020-08-03T17:15:11.48+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 1.95%

Last modified Jun 17, 2026

CVE-2020-12739 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. A denial-of-service vulnerability in the Fanuc i Series CNC (0i-MD and 0i Mate-MD) could allow an unauthenticated, remote attacker to cause an affected CNC to become inaccessible to other devices.. EPSS estimates a 1.95% chance of exploitation in the next 30 days.

Description

A denial-of-service vulnerability in the Fanuc i Series CNC (0i-MD and 0i Mate-MD) could allow an unauthenticated, remote attacker to cause an affected CNC to become inaccessible to other devices.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

1.95%

77.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-400

Affected Software

Vendor	Product	Versions
Fanuc	Series 30i Firmware	All versions
Fanuc	Series 31i Firmware	All versions
Fanuc	Series 32i-B Plus Firmware	All versions
Fanuc	Series 35i-B Firmware	All versions
Fanuc	Power Motion I-Model A Firmware	All versions
Fanuc	Series 0i-Model F Plus Firmware	All versions
Fanuc	Series 0i-Model F Firmware	All versions
Fanuc	Series 32i-Model A Firmware	All versions
Fanuc	Series 0i-Model D Firmware	All versions
Fanuc	Series 0i-Mate D Firmware	All versions
Fanuc	Series 0i-Model C Firmware	All versions
Fanuc	Series 16i Firmware	All versions
Fanuc	Series 18i Firmware	All versions
Fanuc	Series 21i-Model B Firmware	All versions
Fanuc	Series 0i-Model B Firmware	All versions
Fanuc	Series 18i-Wb Firmware	All versions

References

http://jvn.jp/en/jp/JVN84959128/index.htmlThird Party Advisory
https://jvn.jp/en/jp/JVN84959128/index.htmlThird Party Advisory
https://jvn.jp/jp/JVN84959128/index.htmlThird Party Advisory
https://www.fanuc.co.jp/eindex.htmlVendor Advisory
http://jvn.jp/en/jp/JVN84959128/index.htmlThird Party Advisory
https://jvn.jp/en/jp/JVN84959128/index.htmlThird Party Advisory
https://jvn.jp/jp/JVN84959128/index.htmlThird Party Advisory
https://www.fanuc.co.jp/eindex.htmlVendor Advisory

Timeline

Published: Aug 3, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-12739?

A denial-of-service vulnerability in the Fanuc i Series CNC (0i-MD and 0i Mate-MD) could allow an unauthenticated, remote attacker to cause an affected CNC to become inaccessible to other devices.

How severe is CVE-2020-12739?

CVE-2020-12739 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 1.95% probability of exploitation in the next 30 days.

How do I fix CVE-2020-12739?

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-2020-12739?

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

Scan your code now

Source: NVD / NIST