CVE-2020-16875

A remote code execution vulnerability exists in Microsoft Exchange server due to improper validation of cmdlet arguments. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the System user, aka ‘Microsoft Exchange Server Remote Code Execution Vulnerability’. Note: As of January 12, 2021, the patch for CVE-2020-16875 has been bypassed twice. See CVE-2020-17132 for details.

Recent assessments:

ccondon-r7 at September 09, 2020 6:14pm UTC reported:

There’s more info in Rapid7’s analysis here, but as @tsellers-r7 and**@smcintyre-r7** pointed out privately today, need for authenticated session + exposed PowerShell endpoint + user who belongs to specific Exchange groups = less opportunity for wide-scale attacks than something like February’s Exchange vuln. I’m interested to see how Steven Seeley’s exploit works if he releases it, though. Might be cause for quick re-evaluation.

Assessed Attacker Value: 5
Assessed Attacker Value: 5Assessed Attacker Value: 4