Rockwell Automation OTTO Fleet Manager

Summary

A vulnerability (CVE-2026-75112) in Rockwell Automation's OTTO Fleet Manager, affecting versions <=V2.36.2, allows attackers to more easily perform offline brute-force attacks against stored password hashes due to insufficient computational effort in its bcrypt implementation. This could lead to compromised credentials if an unencrypted system backup is accessed. Rockwell Automation has released version 2.36.3 to address the issue.

Full text

ICS Advisory Rockwell Automation OTTO Fleet Manager Release DateAugust 27, 2026 Alert CodeICSA-26-239-03 Related topics: Industrial Control System Vulnerabilities , Industrial Control Systems View CSAF Summary Successful exploitation of this vulnerability could reduce the computational cost required for an attacker to perform offline brute-force attacks against stored password hashes. The following versions of Rockwell Automation OTTO Fleet Manager are affected: OTTO Fleet Manager <=V2.36.2 (CVE-2026-75112) CVSS Vendor Equipment Vulnerabilities v3 6.8 Rockwell Automation Rockwell Automation OTTO Fleet Manager Use of Password Hash With Insufficient Computational Effort Background Critical Infrastructure Sectors: Critical Manufacturing, Transportation Systems Countries/Areas Deployed: Worldwide Company Headquarters Location: United States Vulnerabilities Expand All + CVE-2026-75112 A security issue exists within OTTO Fleet Manager. The vulnerability stems from the use of an insufficient work factor in the bcrypt password hashing implementation, which could reduce the computational cost required for an attacker to perform offline brute-force attacks against stored password hashes. If an attacker gains access to an unencrypted system backup, the weakly hashed credentials could be more easily compromised. View CVE Details Affected Products Rockwell Automation OTTO Fleet Manager Vendor:Rockwell Automation Product Version:Rockwell Automation OTTO Fleet Manager: <=V2.36.2 Product Status:known_affected Remediations MitigationRockwell Automation has addressed this vulnerability in software version 2.36.3.https://file-share.ottomotors.com/login MitigationUsers of the affected software who are not able to upgrade to the corrected version or apply the mitigations should use Rockwell Automation's security best practices.https://support.rockwellautomation.com/app/answers/answer_view/a_id/1085012/loc/en_US#__highlight Vendor fixSee Rockwell Automation security advisory SD1791 for more information about this issue and instructions to enable encrypted system backup in OTTO Fleet Manager.https://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1791.html MitigationIf you have any questions regarding the security issue(s) above and how to mitigate them, contact Rockwell Automation support.https://ottomotors.com/otto-care/ MitigationIf you have any questions regarding this disclosure, please email Rockwell Automation PSIRT: rasecure@ra.rockwell.commailto:rasecure@ra.rockwell.com Relevant CWE: CWE-916 Use of Password Hash With Insufficient Computational Effort Metrics CVSS Version Base Score Base Severity Vector String 3.1 6.8 MEDIUM CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N 4.0 6.9 MEDIUM CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N Acknowledgments Rockwell Automation reported this vulnerability to CISA Legal Notice and Terms of Use This product is provided subject to this Notification (https://www.cisa.gov/notification) and this Privacy & Use policy (https://www.cisa.gov/privacy-policy). Recommended Practices CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet. Locate control system networks and remote devices behind firewalls and isolating them from business networks. When remote access is required, use more 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 the 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 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. CISA also recommends users take the following measures to protect themselves from social engineering attacks: Do not click web links or open attachments in unsolicited email messages. Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams. Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks. No known public exploitation specifically targeting this vulnerability has been reported to CISA at this time. This vulnerability is not exploitable remotely. Revision History Initial Release Date: 2026-08-27 Date Revision Summary 2026-08-27 1 Initial Republication of Rockwell Automation SD1791. Legal Notice and Terms of Use This product is provided subject to this Notification and this Privacy & Use policy. Vendor Rockwell Automation Tags Sector: Critical Manufacturing Sector, Transportation Systems Sector Topics: Industrial Control System Vulnerabilities, Industrial Control Systems Please share your thoughts We recently updated our anonymous product survey; we welcome your feedback. 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Indicators of Compromise

• cve — CVE-2026-75112

Entities