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PatchSiren cyber security CVE debrief

CVE-2025-41450 Danfoss CVE debrief

CVE-2025-41450 is a high-severity access-control issue in Danfoss AK-SM 8xxA Series versions prior to R4.2. CISA’s advisory says a datetime-based password generation weakness could allow unauthorized access and potentially an authentication bypass. Danfoss addressed the issue in R4.2.

Vendor
Danfoss
Product
AK-SM 8xxA Series
CVSS
HIGH 8.2
CISA KEV
Not listed in stored evidence
Original CVE published
2025-05-20
Original CVE updated
2025-08-26
Advisory published
2025-05-20
Advisory updated
2025-08-26

Who should care

OT/ICS operators, building automation teams, asset owners, and defenders responsible for Danfoss AK-SM 8xxA Series installations, especially any deployment still running versions earlier than R4.2.

Technical summary

The CISA CSAF advisory for ICSA-25-140-03 identifies Danfoss AK-SM 8xxA Series < R4.2 as affected. The issue is described as unauthorized access caused by datetime-based password generation, which could potentially result in authentication bypass. The advisory assigns CVSS v3.1 8.2 (AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:H), indicating a network-reachable but higher-complexity attack path that still requires user interaction. Danfoss states that release R4.2 addresses CVE-2025-41450.

Defensive priority

High. Prioritize remediation for any affected AK-SM 8xxA Series device running before R4.2, particularly where remote access paths or shared operational access exist.

Recommended defensive actions

  • Inventory all Danfoss AK-SM 8xxA Series devices and verify installed versions.
  • Upgrade affected systems to Danfoss R4.2 using the vendor’s AK-SM 800A Software Upgrade Process.
  • Restrict and segment access to the device management interface until upgrades are complete.
  • Review authentication and access logs for unexpected access attempts or anomalies.
  • Follow CISA industrial control system recommended practices for hardening and defense in depth.

Evidence notes

Source basis is the CISA CSAF advisory ICSA-25-140-03 for CVE-2025-41450, first published 2025-05-20 and modified 2025-08-26. The advisory’s affected-product entry lists Danfoss AK-SM 8xxA Series < R4.2, and its remediation entry says R4.2 addresses CVE-2025-41450. The 2025-08-26 update A added CVE-2025-41451 and CVE-2025-41452 but did not change the original publication date for this CVE.

Sources and references

Verified primary and authoritative sources

  • CVE-2025-41450 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2025-41450

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2025-41450 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2025-41450

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2025/icsa-25-140-03.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-25-140-03

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/uscert/ics/alerts/ICS-ALERT-10-301-01

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/resources-tools/resources/ics-recommended-practices

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/publications/Cybersecurity_Best_Practices_for_Industrial_Control_Systems.pdf

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/topics/industrial-control-systems

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/uscert/sites/default/files/publications/emailscams0905.pdf

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/uscert/ncas/tips/ST04-014

    Reference

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.