Elastic critical stable eql

Potential Telnet Authentication Bypass (CVE-2026-24061)

Identifies potential exploitation of a Telnet remote authentication bypass vulnerability (CVE-2026-24061) in GNU Inetutils telnetd. The vulnerability allows unauthenticated access by supplying a crafted `-f <username>` value via the `USER` environment variable, resulting in a login process spawned with elevated privileges.

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Detection Logic

process where host.os.type == "linux" and event.type == "start" and
  event.action in ("exec", "exec_event", "start", "ProcessRollup2", "executed") and
  process.name == "login" and process.parent.name in ("telnetd", "xinetd") and process.args : "-*f*"

Field Validations

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