Microsoft Exchange Server Security Feature Bypass Vulnerability (CVE-2021-31207)
Severity: medium · Patch status: patched · Since 2021-11-03 · CVE-2021-31207
Microsoft Exchange Server contains an unspecified vulnerability that allows for security feature bypass. CISA added CVE-2021-31207 to its Known Exploited Vulnerabilities catalog on Nov 3, 2021, which means attackers are exploiting it in the wild. CISA reports known use in ransomware campaigns.
What to do
- Apply updates per vendor instructions.
- US federal agencies must remediate by Nov 17, 2021 (BOD 22-01); treat that as the outer limit.
Sources
All live incidents on Threat Watch
