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CVE-2026-82971 – Unauthenticated Remote Command Execution – QVidium Opera11 (3.3.2a26-Ax4x-opera11)

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Summary

CVE-2026-82971 is a critical, unauthenticated OS command injection vulnerability in QVidium Opera11 firmware version 3.3.2a26-Ax4x-opera11. The flaw resides in the /cgi-bin/net_tr.cgi CGI script, where the ipaddr request parameter is passed to an underlying system call without proper sanitization, allowing a remote, unauthenticated attacker to execute arbitrary operating system commands on the device. The vulnerability has been assigned a maximum CVSS v3.1 base score of 10.0 (Critical), and public exploit code is reportedly available.

Technical details

  • Root cause: The net_tr.cgi CGI script on QVidium Opera11 fails to properly validate or sanitize the ipaddr parameter before using it in a system-level command (consistent with CWE-77 Command Injection / CWE-74 Improper Neutralization of Special Elements).
  • Trigger conditions: An attacker sends a crafted HTTP request to /cgi-bin/net_tr.cgi with a malicious value injected into the ipaddr parameter (e.g., shell metacharacters appended to trigger execution of attacker-controlled commands).
  • Attack vector: Network-based, requires no authentication and no user interaction, and has low attack complexity — the endpoint is reachable directly over HTTP/HTTPS to the device’s management interface.
  • Impact: Successful exploitation results in arbitrary command execution on the underlying device operating system, typically with elevated (root-level) privileges, leading to full compromise of confidentiality, integrity, and availability of the device.

Affected software

  • QVidium Opera11 firmware, version 3.3.2a26-Ax4x-opera11 (CPE: cpe:2.3:o:qvidium:opera11_firmware:*:*:*:*:*:*:*:*)

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

  • No vendor patch is available. Public reporting indicates QVidium has ceased business operations and no longer sells products or provides support, meaning an official firmware fix is not expected.
  • Immediately remove Opera11 devices from direct internet exposure; ensure the management/CGI web interface (including /cgi-bin/net_tr.cgi) is not reachable from untrusted or public networks.
  • Restrict access to the device’s HTTP management interface to a dedicated, tightly controlled management VLAN or via a VPN, and enforce strict firewall/ACL rules limiting source IPs.
  • Deploy a web application firewall (WAF) or reverse proxy in front of the device to filter requests containing shell metacharacters in the ipaddr parameter as a compensating control.
  • Given the lack of vendor support, security teams should treat affected devices as end-of-life and plan migration to a supported, actively maintained replacement product.
  • Monitor network traffic and logs for anomalous requests to /cgi-bin/net_tr.cgi or unexpected outbound connections/command execution originating from the device.

References

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