CISA warned that hackers are actively exploiting a recently patched high-severity flaw in SolarWinds Serv-U software to crash servers and added it to its Known Exploited Vulnerabilities Catalog. The agency ordered federal agencies to patch by June 19 and urged all organizations to mitigate the ongoing attacks immediately.

Remote attackers can exploit the security flaw without privileges in low-complexity attacks that do not require user interaction.
Over the past several years, CISA has tagged 11 vulnerabilities across various SolarWinds products as actively exploited in attacks, one of which has also been abused by ransomware gangs.
Admins should apply the Serv-U 15.5.4 Hotfix 1 without delay or block content-encoding POST requests to prevent unauthenticated remote crashes.
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