CVE-2021-40333

Weak default credential associated with TCP port 26

Description

Weak Password Requirements vulnerability in Hitachi Energy FOX61x, XCM20 allows an attacker to gain unauthorized access to the Data Communication Network (DCN) routing configuration. This issue affects: Hitachi Energy FOX61x versions prior to R15A. Hitachi Energy XCM20 versions prior to R15A.

Remediation

Solution:

  • Fixed in FOX61x R14A Hotfix or XMC20 R14A Hotfix Fixed in FOX61x R15A or XMC20 R15A

Workaround:

  • Recommended security practices and firewall configurations help protecting systems from attacks that originate from outside the network. Such practices include that network management systems and XMC20 networks are typically physically protected from direct access by unauthorized personnel and have no direct connections to the Internet, as well as are separated from other networks by means of a firewall system that has a minimal number of ports exposed (e.g., traffic to TCP port 26 should be blocked/dropped), and others that have to be evaluated case by case. Portable computers and removable storage media should be carefully scanned for viruses before they are connected to a control system.

Category

9.0
CVSS
Severity: Critical
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.20%
Vendor Advisory abb.com Vendor Advisory abb.com
Affected: Hitachi Energy FOX61x
Affected: Hitachi Energy XCM20
Published at:
Updated at:

References

Link Tags
https://search.abb.com/library/Download.aspx?DocumentID=8DBD000062&LanguageCode=en&DocumentPartId=&Action=Launch vendor advisory
https://search.abb.com/library/Download.aspx?DocumentID=8DBD000069&LanguageCode=en&DocumentPartId=&Action=Launch vendor advisory

Frequently Asked Questions

What is the severity of CVE-2021-40333?
CVE-2021-40333 has been scored as a critical severity vulnerability.
How to fix CVE-2021-40333?
To fix CVE-2021-40333: Fixed in FOX61x R14A Hotfix or XMC20 R14A Hotfix Fixed in FOX61x R15A or XMC20 R15A
Is CVE-2021-40333 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-40333 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-40333?
CVE-2021-40333 affects Hitachi Energy FOX61x, Hitachi Energy XCM20.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.