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PatchSiren cyber security CVE debrief

CVE-2026-25084 ZLAN Information Technology Co. CVE debrief

CVE-2026-25084 is a critical authentication-bypass issue affecting ZLAN Information Technology Co. ZLAN5143D devices. According to the CISA CSAF advisory, authentication can be bypassed by directly accessing internal URLs, which can allow an unauthenticated attacker to reach functionality that should be protected.

Vendor
ZLAN Information Technology Co.
Product
ZLAN5143D
CVSS
CRITICAL 9.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-02-10
Original CVE updated
2026-02-10
Advisory published
2026-02-10
Advisory updated
2026-02-10

Who should care

Organizations that deploy or administer ZLAN5143D devices, especially teams responsible for device administration, network segmentation, and monitoring of externally or internally reachable management interfaces.

Technical summary

The advisory describes an authentication bypass caused by direct access to internal URLs. The supplied CVSS vector is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, indicating a network-reachable issue with no privileges or user interaction required and the potential for high confidentiality, integrity, and availability impact. The advisory also maps the weakness to CWE-306 (Missing Authentication for Critical Function).

Defensive priority

Immediate. Treat as a high-risk exposure on any reachable ZLAN5143D deployment until vendor guidance or a fix is available.

Recommended defensive actions

  • Inventory all ZLAN5143D devices and determine whether any management or internal URLs are reachable from untrusted networks.
  • Restrict access to device administration interfaces with network segmentation, allowlisting, VPN-only access, or equivalent controls.
  • Monitor authentication and access logs for unusual direct access to internal URLs or unexpected administrative activity.
  • Contact ZLAN Information Technology Co. for update and remediation guidance using the vendor contact path cited in the advisory.
  • Apply vendor updates as soon as they are available and verify that the authentication bypass is no longer reachable.
  • Review adjacent systems and operational procedures for any reliance on the affected device's trust boundary assumptions.

Evidence notes

This debrief is based on the CISA CSAF advisory ICSA-26-041-02 and its embedded metadata for CVE-2026-25084. The source corpus explicitly states that authentication can be bypassed by directly accessing internal URLs, includes the CVSS 3.1 vector, identifies CWE-306, and notes that ZLAN Information Technology Co. did not respond to CISA's coordination attempts. Publication date used here is the supplied CVE/advisory publication date of 2026-02-10.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-25084 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-25084

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

  • CVE-2026-25084 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-25084

    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/2026/icsa-26-041-02.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-26-041-02

    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/news-events/ics-alerts/ics-alert-10-301-01

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf

    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.