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CVE-2026-100291 – Authentication Bypass on ONVIF Service Endpoints – Anjvision YSSD-RTMP-H5 Firmware

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Summary

CVE-2026-100291 is a critical authentication bypass vulnerability affecting the Anjvision YSSD-RTMP-H5 device, caused by insecure default initialization of ONVIF service endpoints (CWE-1188). Multiple ONVIF management endpoints process requests without enforcing required authentication, allowing unauthenticated remote attackers to access sensitive device operations. The flaw carries a CVSS v3.1 base score of 9.8 (Critical), with a CVSS v4.0 score of 9.3.

Technical details

  • Root cause: The device initializes certain ONVIF service endpoints with insecure defaults, resulting in authentication checks not being enforced on management-related requests.
  • Trigger conditions: An attacker sends requests directly to the affected ONVIF endpoints over the network; no credentials, user interaction, or prior access are required.
  • Attack vector: Network-based (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N).
  • Impact: Successful exploitation allows unauthorized access to sensitive device operations, with confidentiality, integrity, and availability impacts all rated High — potentially enabling attackers to view, modify, or disrupt device configuration and functionality.
  • Context: This vulnerability was disclosed as part of a broader cluster of flaws (CVE-2026-100291 through CVE-2026-100299) affecting the same firmware build, which also includes OS command injection, hard-coded credentials, weak credential storage, and cryptographic signature verification issues.

Affected software

  • Anjvision YSSD-RTMP-H5 — firmware version 3.3.2.4_build_2024-12-26

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  • CVSS v4.0 Base Score: 9.3 (Critical)

Mitigation and recommended actions

  • Immediate: No vendor patch is currently available. Anjvision has not engaged with CISA to develop remediation for this vulnerability cluster and has not committed to a fix timeline.
  • Network mitigations (recommended in the absence of a patch):
    • Do not expose the affected device or its ONVIF service endpoints directly to the internet.
    • Place the device behind a firewall and isolate it on a segmented network separate from business-critical systems.
    • Restrict network access to ONVIF endpoints to trusted management hosts/VLANs only.
    • Require VPN access (with the VPN itself kept fully patched) for any remote management needs.
    • Monitor for unauthenticated or anomalous requests to ONVIF management endpoints.
    • Contact Anjvision support directly to inquire about firmware updates or compensating guidance.

References

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