South Korea·Telecom·Announced by the organization or a regulator
KT data breach (Sep 2025)
KT (South Korea) disclosed a data breach on Sep 5, 2025 affecting 16,647 people, involving SIM or call records and phone numbers. It is the fourth of 4 KT incidents recorded on Teollimi. It was caused by a cyberattack. The fine was ₩54 billion. The company announced compensation.
What happened
KT's network was abused through illegal femtocells, enabling unauthorized small-value payments and leaking subscriber information.
This page summarizes and translates our record written in Korean. Counts and dates come from that record unchanged. Read the original record →
Facts on record
- Country
- South Korea
- Industry
- Telecom
- Announced
- Sep 5, 2025
- Affected
- 16,647 people
- Data exposed
- SIM or call records, phone numbers
- Status
- Announced by the organization or a regulator
- Compensation and penalties
- Compensation or a settlement on record · A fine or other penalty on record