Ukraine
UKR
Cyberattack disables Kyivstar mobile and fixed telecommunications across Ukraine
On 12 December 2023, a cyberattack on Kyivstar disrupted Ukrainian subscribers' mobile voice, internet and other communications services. The operator's parent VEON confirmed extensive network unavailability and phased restoration beginning that evening; by 19 December, services in all categories were restored and approximately 99% of base stations in government-controlled territory were active. A subsequent SEC filing attributed USD 23 million in lost 2023 revenue and USD 46 million in 2024 to the incident and related customer concessions.
93
Estimated severity
93 / 100
98
Source reliability
98 / 100
Approximate Date
2023-12-12
Targeted Company
KYIVSTAR
Targeted Company Supply Chain Impact
Distribution & Fulfillment
Procurement & Sourcing
Production & Manufacturing
Sales (Retail & Ecommerce)
Warehousing
Service Delivery
Unrecognized Impact
Supply Chain Relations
No information
Geographic Impact
Country Targeted Company
Other Affected Countries
No other affected countries reported
Target country
Ukraine
Affected countries
Ukraine
Impacted regions
No information
Operational Impact
Duration
No information
Financial impact (USD M)
$69M
Impact types
Service degradationService unavailability
Affected sectors
Telecommunications
Affected departments
Information Technology
Attack Profile
Attack types
Data destructionUnauthorized access
Attributed threat actors
SANDWORM
Sources
Incident Sources
veon.comhttps://www.veon.com/newsroom/press-releases/kyivstar-provides-update-on-cyber-attack-recoveryveon.comhttps://www.veon.com/newsroom/press-releases/kyivstar-restores-services-in-all-categories-brings-99-of-mobile-network-back-on-airsec.govhttps://www.sec.gov/Archives/edgar/data/2062440/000206244026000006/kyiv-20251231.htmssu.gov.uahttps://ssu.gov.ua/en/novyny/sbu-dopomahaie-kyivstaru-vidnovyty-robotu-merezhi