Ollama API Accessed from External Network

Last updated 5 days ago on 2026-01-09

Created 5 days ago on 2026-01-09

About

Detects when the Ollama LLM server accepts connections from external IP addresses. Ollama lacks built-in authentication, so exposed instances allow unauthenticated model theft, prompt injection, and resource hijacking.

Tags

Domain: EndpointOS: LinuxOS: macOSOS: WindowsUse Case: Threat DetectionTactic: Initial AccessData Source: Elastic DefendDomain: LLMMitre Atlas: T0040Mitre Atlas: T0044Language: eql

Severity

medium

Risk Score

MITRE ATT&CK™

Initial Access (TA0001)(external, opens in a new tab or window)

↳ Exploit Public-Facing Application (T1190)(external, opens in a new tab or window)

License

Elastic License v2(external, opens in a new tab or window)

Definition

Rule Type: Event Correlation Rule
Integration Pack: Prebuilt Security Detection Rules
Index Patterns: logs-endpoint.events.network-*
Related Integrations: endpoint(external, opens in a new tab or window)
Query

✄𐘗text code block:
✄𐘗network where event.action == "connection_accepted" and
  process.name in ("ollama", "ollama.exe") and
  destination.port == 11434 and
  source.ip != null and source.ip != "0.0.0.0" and
  not cidrmatch(source.ip, 
    "10.0.0.0/8", 
    "127.0.0.0/8", 
    "169.254.0.0/16", 
    "172.16.0.0/12", 
    "192.168.0.0/16",
    "100.64.0.0/10",
    "::1",
    "fe80::/10",
    "fc00::/7",
    "ff00::/8"
  )

Install detection rules in Elastic Security

Detect Ollama API Accessed from External Network in the Elastic Security detection engine by installing this rule into your Elastic Stack.

To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(external, opens in a new tab or window).