ABB RMC-100

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1. EXECUTIVE SUMMARY CVSS v4 8.2 ATTENTION: Exploitable remotely/low attack complexity Vendor: ABB Equipment: RMC-100 Vulnerabilities: Use of Hard-coded Cryptographic Key, Stack-based Buffer Overflow
2. RISK EVALUATION Successful exploitation of these vulnerabilities could allow an attacker to gain unauthenticated access to the MQTT configuration data, cause a denial-of-service condition on the MQTT configuration web server (REST interface), or decrypt encrypted MQTT broker credentials.
3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS ABB reports the following versions of RMC-100 with the REST interface are affected. The vulnerabilities are only present when the REST interface is enabled. This interface is disabled by default: RMC-100: 2105457-043 through 2105457-045 RMC-100 LITE: 2106229-015 through 2106229-016 3.2 VULNERABILITY OVERVIEW 3.2.1 USE OF HARD-CODED CRYPTOGRAPHIC KEY CWE-321 When the REST interface is enabled by the user, and an attacker gains access to the source code and the control network, the attacker can bypass REST interface authentication and gain access to MQTT configuration data. CVE-2025-6074 has been assigned to this vulnerability. A CVSS v3.1 base score of 6.5 has been calculated; the CVSS vector string is (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N). A CVSS v4 score has also been calculated for CVE-2025-6074. A base score of 6.3 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N). 3.2.2 STACK-BASED BUFFER OVERFLOW CWE-121 When the REST interface is enabled by the user, if an attacker gains access to the control network, user/password broker authentication is enabled, and CVE-2025-6074 is exploited, the attacker can overflow the buffer for the username or password. CVE-2025-6073 has been assigned to this vulnerability. A CVSS v3.1 base score of 7.5 has been calculated; the CVSS vector string is (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). A CVSS v4 score has also been calculated for CVE-2025-6073. A base score of 8.2 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N). 3.2.3 STACK-BASED BUFFER OVERFLOW CWE-121 When the REST interface is enabled by the user, if an attacker gains access to the control network and exploits CVE-2025-6074, the attacker can use the JSON configuration to overflow the expiration date field. CVE-2025-6072 has been assigned to this vulnerability. A CVSS v3.1 base score of 7.5 has been calculated; the CVSS vector string is (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). A CVSS v4 score has also been calculated for CVE-2025-6072. A base score of 8.2 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N). 3.2.4 USE OF HARD-CODED CRYPTOGRAPHIC KEY CWE-321 An attacker can gain access to salted information to decrypt MQTT information. CVE-2025-6071 has been assigned to this vulnerability. A CVSS v3.1 base score of 5.3 has been calculated; the CVSS vector string is (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N). A CVSS v4 score has also been calculated for CVE-2025-6071. A base score of 6.3 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N). 3.3 BACKGROUND CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing COUNTRIES/AREAS DEPLOYED: Worldwide, except regions mandated to follow EU CRA COMPANY HEADQUARTERS LOCATION: Switzerland 3.4 RESEARCHER Vera Mens of Claroty Team82 reported these vulnerabilities to ABB.
4. MITIGATIONS ABB recommends disabling the REST interface when it is not being used to configure the MQTT functionality. By default, when the REST interface is disabled so there is no risk. The RMC-100 is not intended for access over public networks such as the Internet. An attacker would need access to the user’s private control network to exploit these vulnerabilities. Proper network segmentation is recommended. For more information, see ABB’s cybersecurity advisory. For any installation of software-related products, ABB strongly recommends the following (non-exhaustive) list of cybersecurity practices: Isolate special-purpose networks (e.g., for automation systems) and remote devices behind firewalls and separate them from any general-purpose networks (e.g., office or home networks). Install physical controls to ensure that no unauthorized personnel can access devices, components, peripheral equipment, and networks. Never connect programming software or computers containing programming software to any network other than the network for the devices that it is intended for. Scan all data imported into your environment before use to detect potential malware infections. Minimize network exposure for all applications and endpoints to ensure that they are not accessible from the Internet unless they are designed for such exposure and the intended use requires such. Ensure all nodes are always up-to-date in terms of installed software, operating system, and firmware patches as well as antivirus and firewall. When remote access is required, use secure methods, such as virtual private networks (VPNs). Recognize that VPNs may have vulnerabilities and should be updated to the most current version available. Also, understand that VPNs are only as secure as the connected devices. CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. 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 on 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 Strategies. CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets. 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 Strategies. 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 exploitation specifically targeting these vulnerabilities has been reported to CISA at this time.
5. UPDATE HISTORY July 15, 2025: Initial Publication