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CVE-2026-19977 – Unauthenticated Session-Validation Bypass (Critical) – ipTIME A3004T Firmware 14.19

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Summary

CVE-2026-19977 is a critical improper authentication vulnerability (CWE-287) affecting the EFM ipTIME A3004T wireless router, version 14.19.0. The flaw resides in the httpcon_check_session_url function of the device’s session validation component, and can be exploited remotely without any prior authentication. The issue carries the maximum CVSS severity rating.

Technical details

  • Root cause: The httpcon_check_session_url function, part of the router’s session validation logic, does not correctly enforce authentication checks on incoming requests.
  • Trigger condition: An attacker sends a manipulated request to the affected session-handling routine on the device’s web management interface.
  • Attack vector: Network-based; no authentication or user interaction is required to exploit the flaw.
  • Impact: Successful exploitation results in improper authentication, allowing an attacker to bypass session validation and gain unauthorized access to the device, with high impact on confidentiality, integrity, and availability.

Affected software

  • EFM ipTIME A3004T, firmware version 14.19.0

Severity

  • CVSS v3.1 Base Score: 10.0 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Check with the vendor (EFM/ipTIME) for a firmware update addressing this specific session-validation issue and apply it as soon as it is available; no fixed version has been confirmed publicly at the time of writing.
  • If no patch is available: Restrict access to the router’s web management interface to trusted internal networks only, disable remote/WAN administration, and place the device behind a firewall or VPN so the management interface is not directly internet-exposed. Monitor device logs for unexpected session or authentication activity, and consider replacing end-of-service devices that no longer receive vendor updates.

References

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