295 Malicious IPs Coordinate Brute-Force Assaults on Apache Tomcat Manager Interfaces
Date: June 11, 2025
Category: Network Security / Threat Intelligence
Threat intelligence firm GreyNoise has issued a warning about a “coordinated brute-force activity” aimed at Apache Tomcat Manager interfaces. On June 5, 2025, a significant uptick in brute-force and login attempts was observed, suggesting an organized effort to “identify and access exposed Tomcat services at scale.” A total of 295 unique malicious IP addresses were detected executing brute-force attempts against Tomcat Manager. In the last 24 hours alone, 188 unique IPs have been recorded, predominantly from the United States, the United Kingdom, Germany, the Netherlands, and Singapore. Furthermore, 298 IPs were noted conducting login attempts against Tomcat Manager instances, with all 246 flagged IPs in the past day classified as malicious and hailing from the same locations.