Kyivstar, Ukraine's largest mobile operator, suffered a massive cyberattack that caused nationwide communication outages affecting 24.3 million people (over half of Ukraine's population). The attack occurred on December 12, 2023.
Two or more independent sources agree on the core facts. Additional sources would further strengthen this assessment.
How we assess confidence →Entities
Source Reports
What each source reports. "Source tone" reflects the language used by the outlet — it is not an independent verification.
Kyivstar suffered a massive cyberattack causing 24.3 million people to lose mobile signal on Dec 12, 2023
The attack affected over half of Ukraine's population
During one of the most recent mass cyber-attacks in Ukraine on 12 December 2023, the country's largest mobile operator Kyivstar was targeted, leaving 24 million users without a connection. The SSU assumed that the Russians were behind the attack.
Share This Event
Know another source?
If you've seen this event covered by another news outlet, submit it for editorial review. Approved sources improve our confidence ratings.
This event is rated likely. One more trusted source could elevate it to verified.
Extraction metadata
Extracted: 2026-02-27T18:30:51.954Z
Source story: 25784