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CVE-2026-94089 – Unauthenticated Remote Code Execution – D-Link DIR-868L 2.01b05

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Summary

CVE-2026-94089 is a critical stack-based buffer overflow (CWE-121/CWE-119) in the Authentication Handler component of D-Link DIR-868L routers running firmware 2.01b05. The flaw resides in the strcpy call in /webfa_authentication.cgi, which copies attacker-controlled id and password request parameters into a fixed-size stack buffer without length validation. The vulnerability is remotely exploitable without authentication and has a maximum CVSS v3.1 base score of 10.0; a public proof-of-concept exploit exists.

Technical details

  • Root cause: webfa_authentication.cgi passes the unsanitized id (and password) URL parameters directly to strcpy, which does not bound the copy to the destination stack buffer’s size.
  • Trigger conditions: A single unauthenticated HTTP GET/POST request to /webfa_authentication.cgi with an oversized id parameter (public PoC uses a 1864-byte value) overflows the stack buffer and overwrites the saved return address.
  • Attack vector: Network-based, no authentication or user interaction required (AV:N/AC:L/PR:N/UI:N).
  • Impact: Overwriting the return address gives an attacker control of program execution flow in the CGI process, enabling denial of service (crash of the authentication handler) and potentially arbitrary code execution on the device with the privileges of the web server process.

Affected software

  • D-Link DIR-868L, firmware version 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

Mitigation and recommended actions

  • Immediate: No official D-Link patch or security advisory addressing this CVE has been published at the time of this writing. Check D-Link’s support portal for the DIR-868L for an updated firmware release before relying on any workaround.
  • If no patch: Remove the device’s web administration/authentication interface from direct internet exposure; restrict access to /webfa_authentication.cgi to trusted internal networks only via firewall rules or VPN. Disable remote management on the router. Given D-Link’s history of end-of-life status for legacy router models, evaluate replacing the DIR-868L with a currently supported device if no vendor fix becomes available.

References

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