perimeter breach
Security line crossed
A perimeter breach is unauthorized entry through a boundary intended to keep people out—a security fence, a guarded border, a protected zone.
The term comes from military and security contexts but extends to any defensive boundary: The alarm triggered when sensors detected a perimeter breach.
In cybersecurity, it describes penetration of network defenses.
- intrusionUnauthorized entry into space
- fenceBoundary structure between properties
- broken fenceBarrier no longer intact
- alarmUrgent warning signal
- red alertTop emergency warning state
security · infiltration · trespassing · barrier · wall · no man's land · sensors · motion sensors · detection · unauthorized · entry · surveillance · checkpoint · boundary · compromise · alert · razor wire · wire cutters
- breachesrupture, violation, intrusion, break, infringement
- prison escapesjailbreak, breakout, escapee, tunneling, disguise
- military operationsoffensive, attack, marines, Desert Storm, NATO operations
- security threatshacker, cyberattack, malware, cyber attack, hacking
- aviation threatshijacking, skyjacking, bomb threat, terrorism, explosive
perimeter, breach, perimeters, breaches, breached, breaching, meter, meters, metric