Microsoft rolls out fixes for a total of 114 security flaws, including an actively exploited zero-day and four remote code execution bugs in Exchange Server. Of the 114 flaws, 19 are rated as Critical, 88 are rated Important, and one is rated Moderate in severity. The U.S. Federal Bureau of Investigation carried out a “successful action” to “copy and remove” web shells planted by adversaries on hundreds of victim computers using the ProxyLogon flaws. The FBI is said to have wiped the web shells that were installed by Hafnium that could have been used to maintain and escalate persistent, unauthorized access to networks.
Source: https://thehackernews.com/2021/04/nsa-discovers-new-vulnerabilities.html