Daikin Security Gateway authentication bypass unpatched
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Weak password recovery in Daikin Security Gateway allows unauthenticated remote access; vendor will not patch.
Daikin Europe N.V Security Gateway (App 100, Frm 214) contains a critical authentication bypass vulnerability in its password recovery mechanism (CVE-2025-10127). The flaw allows an attacker to bypass authentication and gain unauthorized system access without credentials via a user-controlled key vulnerability (CWE-640). The vulnerability is remotely exploitable with low attack complexity and has a CVSS v3.1 score of 9.8 and CVSS v4 score of 8.8.
Daikin has stated they will not fix this vulnerability and will respond directly to user inquiries. A public proof-of-concept exploit authored by researcher Gjoko Krstic is available. No active in-the-wild exploitation targeting this specific flaw has been reported to CISA to date, but the presence of public exploits and the critical nature of the vulnerability create significant risk for critical infrastructure operators.
Defenders should implement network segmentation to isolate affected gateways from internet-facing networks, use firewalls and VPNs for any required remote access, and contact Daikin support for guidance on alternative mitigations or product alternatives. Organizations should perform risk assessment before deploying changes given the criticality of these devices in energy sector environments.
Mentioned in this report
Source reporting: https://www.cisa.gov/news-events/ics-advisories/icsa-25-254-10
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