EXPOSURES › CVE-2021-31207
CVE-2021-31207
CRITICAL ⌖ ON CISA KEV · EXPLOITEDMicrosoft Exchange Server vulnerabilities allowed attackers to bypass security features and potentially deploy ransomware, impacting DIB organizations reliant on email infrastructure.
CVE-2021-31207 represents a security feature bypass vulnerability in Microsoft Exchange Server, part of a series of critical flaws including ProxyLogon and ProxyNotShell. These vulnerabilities, actively exploited and linked to ransomware, expose DIB organizations to data breaches and compliance failures (CMMC DF-1, DF-2). Organizations must immediately patch affected servers or migrate to supported versions.
Shame score — The vulnerability's exploitation in ransomware attacks and Microsoft's history of similar Exchange Server flaws demonstrates a significant failure in secure development practices.
▸ RECOMMENDED ACTION Actively exploited (CISA KEV) — remediate now, ahead of your normal patch cycle.
Microsoft Exchange Server contains an unspecified vulnerability that allows for security feature bypass.
| PRODUCT | STATUS |
|---|---|
| Azure Commercial Cloud Microsoft |
Authorized |
| Azure Government (includes Dynamics 365) Microsoft |
Authorized |
| Microsoft Office 365 GCC High Microsoft |
In Process |
| Office 365 Multi-Tenant & Supporting Services Microsoft |
Authorized |