Colt telecoms hit by WarLock ransomware
A WarLock ransomware attack on London-based Colt, believed to have used a SharePoint flaw, took its customer portal, Voice API and number porting offline for weeks, with stolen data put up for sale.
- Service
- Colt Technology Services
- Date
- 12 August 2025
- Cause
- Cyberattack
- Duration
- Not stated or multi-day
- Status
- resolved
- Severity
- major
- Region
- UK
- Source
- Computing ↗
Cite this
Nuffield Consulting, “Colt telecoms hit by WarLock ransomware”, The Daily Tech Wire outage & breach log, 12 Aug 2025. https://techwire.nuffieldconsulting.com/incidents/2025-08-12-colt-technology-services-outage/ (retrieved 15 Nov 2026).
This entry summarises public reporting. Please also cite the original source: Computing, https://www.computing.co.uk/news/2025/security/uk-telco-colt-suffers-major-ransomware-attack-claimed-by-warlock-gang.
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