cve-2025-3699

About this tag
CVE-2025-3699 is a critical missing authentication vulnerability affecting multiple Mitsubishi Electric air conditioning controllers, as documented by CISA. With a CVSS v4 base score of 9.3, this flaw can allow attackers to bypass authentication, potentially disrupting building automation systems and threatening operational safety in commercial and critical infrastructure environments. Discussions on WindowsForum cover the technical details, risk assessment, and remediation strategies for this vulnerability, emphasizing its impact on industrial control systems and the importance of applying vendor-supplied patches and mitigations. The tag also relates to broader CISA advisories on ICS and medical device vulnerabilities.

  1. CISA: 3 Urgent ICS/Medical Advisories (MELSEC iQ-F, Mitsubishi AC, Synapse Mobility)

    CISA’s August 21, 2025 advisory bundle added three urgent entries to the growing list of industrial control system (ICS) and medical-device vulnerabilities security teams must treat as high priority this month. The agency published advisories for a denial-of-service vector in the Mitsubishi...
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    • air conditioning controllers cisa cve-2025-3699 cve-2025-54551 cve-2025-5514 denial of service fujifilm ics industrial control systems ip filtering medical devices melsec iq-f mitsubishi electric network segmentation patch management security bypass synapse vulnerability web interface
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    • Forum: Security Alerts

  2. Critical Mitsubishi Electric HVAC Vulnerability: Risks and Remediation Strategies

    Few cybersecurity issues generate as much alarm—or as many practical ramifications—as those affecting building automation and industrial control systems. This has once again been underscored by a recent vulnerability uncovered in Mitsubishi Electric air conditioning systems, outlined by the...
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    • building automation building management critical infrastructure cve-2025-3699 cyber risk management cyber threats cybersecurity cybersecurity best practices facility security firmware hvac security ics security industrial control systems industrial cybersecurity network segmentation operational technology patch management remote exploitation threat mitigation vulnerability disclosure
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    • Forum: Security Alerts