Threat Intelligence Mastodon hit by DDoS attack, disrupting flagship server April 21, 2026 Share By SC Staff (Adobe Stock) As reported by TechCrunch, Mastodon's primary server, mastodon.social, experienced a significant distributed denial-of-service (DDoS) attack on Monday, rendering the instance intermittently unusable and causing widespread disruption for its users. The cyberattack began early Monday morning, with Mastodon confirming the investigation around 7 a.m. ET. The attack flooded the server with junk web traffic, aiming to overwhelm its systems. By 9:05 a.m. ET, Mastodon announced a countermeasure had been implemented, restoring accessibility, though some instability persisted due to the ongoing nature of the attack. This incident follows a similar DDoS attack that recently impacted Bluesky, another decentralized social network. Distributed denial-of-service attacks, while not involving data theft, can be highly disruptive by making services inaccessible. Source: TechCrunch SC Staff Related Threat Intelligence Iran alleges US cyberattacks; China amplifies claims SC Staff April 21, 2026 The allegations posit that a hidden backdoor within the firmware or bootloader of networking equipment, potentially activated by a satellite signal or at a predetermined time, allowed for remote sabotage. Ransomware SystemBC botnet linked to Gentlemen ransomware attacks SC Staff April 21, 2026 The Gentlemen ransomware-as-a-service (RaaS) operation, active since mid-2025, offers encryption for various systems including Windows, Linux, and ESXi hypervisors. Network Security GreyNoise finds attacker activity surges before vulnerability disclosures Laura French April 21, 2026 The median lead time between activity surge and advisory publication was 11 days. Related Events Cybercast Better Threat Intelligence Between Public and Private Sectors On-Demand Event Virtual Conference Nationwide Cybersecurity Summit 2025: Safeguarding America’s Digital Future On-Demand Event Virtual Conference Securing the Future of Finance: Strategies to Counter Modern Cyber Threats On-Demand Event Get daily email updates SC Media's daily must-read of the most current and pressing daily news Business Email By clicking the Subscribe button below, you agree to SC Media Terms of Use and Privacy Policy . Subscribe Related Terms Account Harvesting DNS Spoofing Deauthentication Attack Denial of Service Distributed Scans Domain Hijacking Fault Line Attacks Google Hacking Hybrid Attack Reconnaissance You can skip this ad in 5 seconds