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AUSCERT External Security Bulletin Redistribution
Advisory (icsa-22-263-02) Hitachi Energy AFF660/665 Series
21 September 2022
AusCERT Security Bulletin Summary
Product: Hitachi Energy AFF660/665 Series
Operating System: Network Appliance
CVE Names: CVE-2020-6994
Comment: CVSS (Max): 9.8 CVE-2020-6994 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
CVSS Source: ICS-CERT
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ICS Advisory (ICSA-22-263-02)
Hitachi Energy AFF660/665 Series
Original release date: September 20, 2022
All information products included in https://us-cert.cisa.gov/ics are provided
"as is" for informational purposes only. The Department of Homeland Security
(DHS) does not provide any warranties of any kind regarding any information
contained within. DHS does not endorse any commercial product or service,
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is governed by the Traffic Light Protocol (TLP) marking in the header. For more
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1. EXECUTIVE SUMMARY
o CVSS v3 9.8
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor: Hitachi Energy
o Equipment: AFF660/665 Firewall
o Vulnerability: Stack-based Buffer Overflow
2. RISK EVALUATION
Successful exploitation of this vulnerability could overflow a buffer on the
device and fully compromise it.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of Hitachi Energy AFF660/665, an industrial firewall,
o Hitachi Energy AFF660 FW: Versions 03.0.02 and prior
o Hitachi Energy AFF665 FW: Versions 03.0.02 and prior
3.2 VULNERABILITY OVERVIEW
3.2.1 STACK-BASED BUFFER OVERFLOW CWE-121
An improper parsing of URL arguments allows an attacker to exploit this
vulnerability by crafting specially formed HTTP requests to overflow an
internal buffer. Successful exploitation could cause a full compromise of the
CVE-2020-6994 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/C:H/
o CRITICAL INFRASTRUCTURE SECTORS: Energy
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Switzerland
Hitachi Energy reported this vulnerability to CISA.
Hitachi Energy for AFF660 FW and AFF665 FW versions 03.0.02 and prior
recommends users to implement the following security measures:
o Use the "IP Access Restriction" feature to restrict HTTP and HTTPS traffic
to trusted IP addresses.
o Disable the HTTP and HTTPS server.
Hitachi Energy recommends users follow the recommended security practices and
firewall configurations to help protect from outside attacks. Recommended
security practices include:
o Ensuring process control systems are physically protected from unauthorized
o Ensuring process control systems have no direct connections to the Internet
o Using a firewall system to separate process control systems from separated
from other networks. The firewall system should have only the necessary
Hitachi Energy does not recommend process control systems be used for internet
surfing, instant messaging, or receiving emails. Portable computers and
removable storage media should be carefully scanned for viruses before they are
connected to a control system.
For more information, see Hitachi Energy's security advisory 8DBD000122 .
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability these vulnerabilities. Specifically, users
o When remote access is required, use secure methods, such as Virtual Private
Networks (VPNs), recognizing VPNs may have vulnerabilities and should be
updated to the most current version available. Also recognize VPN is only
as secure as its connected devices.
CISA reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices
on the ICS webpage at cisa.gov/ics . Several CISA products detailing cyber
defense best practices are available for reading and download, including
Improving Industrial Control Systems Cybersecurity with Defense-in-Depth
Additional mitigation guidance and recommended practices are publicly available
on the ICS webpage at cisa.gov/ics in the technical information paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Organizations observing suspected malicious activity should follow established
internal procedures and report findings to CISA for tracking and correlation
against other incidents.
No known public exploits specifically target this vulnerability.
For any questions related to this report, please contact the CISA at:
Toll Free: 1-888-282-0870
CISA continuously strives to improve its products and services. You can help by
choosing one of the links below to provide feedback about this product.
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