Microsoft Defender XDR Portal Outage Affects Threat Hunting Alerts
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Microsoft Defender XDR portal experienced an outage lasting over 10 hours, disrupting access to security alerts and other features. The issue was caused by a traffic spike leading to high CPU utilization. Microsoft applied mitigation measures, and some customers have reported resolution, but a small number still face issues. The outage impacted advanced threat-hunting alerts and device visibility, affecting security operations for affected organizations.
Timeline
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02.12.2025 18:10 1 articles · 23h ago
Microsoft Defender XDR Portal Outage Affects Threat Hunting Alerts
Microsoft Defender XDR portal experienced an outage lasting over 10 hours, disrupting access to security alerts and other features. The issue was caused by a traffic spike leading to high CPU utilization. Microsoft applied mitigation measures, and some customers have reported resolution, but a small number still face issues. The outage impacted advanced threat-hunting alerts and device visibility, affecting security operations for affected organizations.
Show sources
- Microsoft Defender portal outage disrupts threat hunting alerts — www.bleepingcomputer.com — 02.12.2025 18:10
Information Snippets
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The outage began at 06:10 UTC and lasted over 10 hours.
First reported: 02.12.2025 18:101 source, 1 articleShow sources
- Microsoft Defender portal outage disrupts threat hunting alerts — www.bleepingcomputer.com — 02.12.2025 18:10
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The issue was caused by a traffic spike leading to high CPU utilization on components facilitating Microsoft Defender portal functionalities.
First reported: 02.12.2025 18:101 source, 1 articleShow sources
- Microsoft Defender portal outage disrupts threat hunting alerts — www.bleepingcomputer.com — 02.12.2025 18:10
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Microsoft applied mitigation measures to address the impact and increased processing throughput.
First reported: 02.12.2025 18:101 source, 1 articleShow sources
- Microsoft Defender portal outage disrupts threat hunting alerts — www.bleepingcomputer.com — 02.12.2025 18:10
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Some customers have reported resolution, but a small number still face issues.
First reported: 02.12.2025 18:101 source, 1 articleShow sources
- Microsoft Defender portal outage disrupts threat hunting alerts — www.bleepingcomputer.com — 02.12.2025 18:10
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The impacted portal functionality includes missing advanced threat-hunting alerts and devices not appearing.
First reported: 02.12.2025 18:101 source, 1 articleShow sources
- Microsoft Defender portal outage disrupts threat hunting alerts — www.bleepingcomputer.com — 02.12.2025 18:10
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