Last month, Microsoft issued a patch for the CVE-2021-34473 vulnerability, rated 9.1 (out of 10) on the Common Vulnerability Scoring System scale, but organizations likely could be behind in patching Exchange Server. ![]() The Webshells were shown to Lawrence Abrams, a writer at, by security researcher Rich Warren, according to this Aug. "Gonna be a cleanup job ahead for admins." "They're backdooring boxes with webshells that drop other webshells and also executables that periodically call out," Beaumont added in the Aug. Later, he stated that an "Exchange ProxyShell exploitation wave has started," in an Aug. Security researcher and ex-Microsoft employee Kevin Beaumont described seeing an uptick in ProxyShell scanning in this Aug. Recent scanning for a "Critical" remote code execution vulnerability ( CVE-2021-34473) in Exchange Server, dubbed "ProxyShell," has been detected by security researchers.
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