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MITRE ATT&CK® Dictionary

What is initial access in MITRE ATT&CK®?

Initial Access is an ATT&CK tactic describing techniques adversaries use to gain entry into a target environment. It includes behaviors such as phishing, exploiting public-facing applications, and supply-chain compromise.

40-second answer

Initial Access is an ATT&CK tactic describing techniques adversaries use to gain entry into a target environment. It includes behaviors such as phishing, exploiting public-facing applications, and supply-chain compromise.

Glexia analyst context

How this term helps security teams

Glexia connects initial access to vulnerability exposure, identity controls, email security, and incident readiness.

Common use cases

Where practitioners use this concept

  • Exposure management
  • Email defense
  • External attack surface review
Source and licensing

Source: MITRE ATT&CK®. © 2026 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation. MITRE ATT&CK and ATT&CK are registered trademarks of The MITRE Corporation. Glexia is not affiliated with or endorsed by MITRE.

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