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  • Anritsu Remote Spectrum Monitor

    From CISA Advisories@2:263/1 to All on Tue Mar 31 18:11:10 2026
    Anritsu Remote Spectrum Monitor

    View CSAF
    Summary
    Successful exploitation of this vulnerability could allow attackers with network access to alter operational settings, obtain sensitive signal data, or disrupt device availability.
    The following versions of Anritsu Remote Spectrum Monitor are affected:

    Remote Spectrum Monitor MS27100A vers:all/* (CVE-2026-3356)
    Remote Spectrum Monitor MS27101A vers:all/* (CVE-2026-3356)
    Remote Spectrum Monitor MS27102A vers:all/* (CVE-2026-3356)
    Remote Spectrum Monitor MS27103A vers:all/* (CVE-2026-3356)





    CVSS
    Vendor
    Equipment
    Vulnerabilities




    v3 9.8
    Anritsu
    Anritsu Remote Spectrum Monitor
    Missing Authentication for Critical Function




    Background

    Critical Infrastructure Sectors: Communications, Defense Industrial Base, Emergency Services, Transportation Systems
    Countries/Areas Deployed: Worldwide
    Company Headquarters Location: Japan


    Vulnerabilities

    Expand All +

    CVE-2026-3356

    The MS27102A Remote Spectrum Monitor is vulnerable to an authentication bypass that allows unauthorized users to access and manipulate its management interface. Because the device provides no mechanism to enable or configure authentication, the issue is inherent to its design rather than a deployment error.
    View CVE Details

    Affected Products
    Anritsu Remote Spectrum Monitor

    Vendor:Anritsu
    Product Version:Anritsu Remote Spectrum Monitor MS27100A: vers:all/*, Anritsu Remote Spectrum Monitor MS27101A: vers:all/*, Anritsu Remote Spectrum Monitor MS27102A: vers:all/*, Anritsu Remote Spectrum Monitor MS27103A: vers:all/*
    Product Status:known_affected


    Remediations
    MitigationAnritsu has no plans to fix this issue. Anritsu recommends that users deploy Remote Spectrum Monitor within secure network environments to mitigate potential risks.
    MitigationUsers can contact Anritsu Technical Support (1-800-267-4878) for more information.

    Relevant CWE: CWE-306 Missing Authentication for Critical Function

    Metrics




    CVSS Version
    Base Score
    Base Severity
    Vector String




    3.1
    9.8
    CRITICAL
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H








    Acknowledgments

    Souvik Kandar 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.
    No known public exploitation specifically targeting this vulnerability has been reported to CISA at this time.

    Revision History

    Initial Release Date: 2026-03-31




    Date
    Revision
    Summary




    2026-03-31
    1
    Initial Publication




    Legal Notice and Terms of Use

    https://www.cisa.gov/news-events/ics-advisories/icsa-26-090-01

    2026-03-31 12:00 UTC
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