Colt Technology Services, a UK-based telecommunications provider, has been the victim of a cyberattack attributed to the WarLock ransomware gang, which began on August 12, 2025. The attack has led to significant disruptions in several customer-facing services, including Colt Online and Voice API platforms. Following initial reports of a 'technical issue,' the company later confirmed the nature of the incident as a cyberattack, prompting immediate protective measures. 'We took immediate protective measures to ensure the security of our customers, colleagues, and business,' Colt stated, highlighting their proactive approach to the situation. As of August 15, the company is working around the clock to restore access to the impacted systems, which have been offline for several days. Colt emphasized that the affected systems are support services and not the core customer network infrastructure. Furthermore, they stated, 'No evidence that customer or employee data has been improperly accessed' during the breach, which is a critical point of reassurance for its clientele. The attack has raised concerns within the cybersecurity community about the increasing targeting of telecommunications firms by ransomware groups like WarLock. Experts suggest that these attacks reflect a growing trend in cybercrime, where network service providers are often seen as lucrative targets due to their extensive customer data and critical infrastructure roles. As Colt continues to address the disruptions, the company is collaborating with third-party cyber experts to expedite the restoration of services. Customers have been advised to communicate via email or phone, with expectations for slower response times due to the ongoing incident. The situation remains fluid, and Colt has committed to providing updates as more information becomes available. The incident serves as a reminder of the vulnerabilities faced by organizations in the telecommunications industry, which must remain vigilant against evolving cyber threats.
