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CVE-2026-110536 – OS Command Injection (RCE) – D-Link DIR-868L firmware 2.01b05

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Summary

CVE-2026-110536 is an OS command injection vulnerability (CWE-78) in the HNAP CGI handler of the D-Link DIR-868L router, firmware version 2.01b05. It is rated critical, with a CVSS score of 10.0. It is reachable over the network without authentication or user interaction.

Technical details

  • Root cause: the system function in /htdocs/cgibin (HNAP CGI Handler) does not safely handle the SOAPACTION argument, which allows OS command injection.
  • Trigger conditions: an attacker supplies a manipulated SOAPACTION value to the HNAP CGI handler. The CVSS vector indicates no privileges and no user interaction are required.
  • Attack vector: network.
  • Impact: execution of operating system commands on the device, with high impact to confidentiality, integrity and availability. The scope is marked as changed.
  • The CVE record lists a public proof-of-concept exploit on GitHub (exploit maturity "proof-of-concept").

Affected software

  • D-Link DIR-868L firmware 2.01b05

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/E:P/RL:X/RC:R

Mitigation and recommended actions

  • Immediate: the CVE record names no fixed firmware version. D-Link’s support announcement SAP10189 states that the DIR-868L has reached End of Support / End of Life and that firmware development has stopped. Plan to retire and replace the device with a currently supported model.
  • Until replacement, do not expose the router’s web management interface or HNAP services to the internet or untrusted networks.
  • Restrict access to the management interface to trusted internal hosts only.
  • Review exposed assets and devices for signs of compromise, such as unexpected configuration changes or unknown processes.

References

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