CyberSecurity news
FlagThis - #outage
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Sergiu Gatlan@BleepingComputer
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SentinelOne experienced a significant service disruption on May 29th that lasted approximately seven hours, impacting enterprise customers globally. According to a root-cause analysis released by the company, the outage was triggered by a software flaw within an infrastructure control system. This flaw led to the unintended removal of critical network routes and DNS resolver rules, resulting in widespread loss of network connectivity. SentinelOne has emphasized that the disruption was not the result of a cyberattack, but rather a software glitch in an automated process.
The company explained that the flaw occurred during the transition of its production system to a new cloud-based architecture using infrastructure as code principles. A control system slated for deprecation was triggered by the creation of a new account. A software flaw in the configuration comparison function misidentified discrepancies and incorrectly applied what it believed to be the correct configuration state, overwriting existing network settings. While customer endpoints remained protected, security teams were unable to access management consoles and other related services. The incident primarily affected enterprise customers, hindering their ability to manage security operations and access important data. SentinelOne assured customers that their endpoints continued to operate without interruption and that no security data was lost. Federal customers, including those using GovCloud, were unaffected, though they were notified as a precaution. The company has provided a detailed timeline of the outage, which began at 9:37 a.m. ET and was resolved by 4:05 p.m. ET, and is taking steps to prevent future occurrences.
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Dysruption Hub@The Dysruption Hub
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Cellcom, a Wisconsin-based mobile carrier, has confirmed that a cyberattack is the cause of a week-long service outage that began on the evening of May 14, 2025. Customers across Wisconsin and Upper Michigan experienced disruptions to voice and SMS services, leaving them unable to make phone calls or send text messages. Initially, the company attributed the issue to a technical problem but later acknowledged the cyber incident in a video and letter from CEO Brighid Riordan. The attack specifically targeted a network segment responsible for handling voice and SMS, but the company assured customers that sensitive data, such as names, addresses, and financial details, was not compromised.
Cellcom has engaged federal authorities, including the FBI, and international cybersecurity experts to assist in mitigating the impact and restoring full service. CEO Brighid Riordan stated that the company was not unprepared for such an incident and emphasized their commitment to recovery. Partial service has been restored, and the company anticipates a full restoration by the end of the week. Cellcom has also pledged to cover service fees for affected customers during the outage as a gesture of accountability and thanks. The cyberattack on Cellcom highlights the critical importance of cybersecurity and the potential consequences of a breach on essential communication services. The outage has disrupted both personal and business communications, with some customers reporting business losses due to the prolonged downtime. The Wisconsin Department of Agriculture, Trade and Consumer Protection has received at least 15 customer complaints related to the disruption. Cellcom is advising affected users to try turning on their phone’s airplane mode for 10 seconds or restarting their device if they continue to experience connection issues.
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