EXPOSURES › CVE-2021-31196
CVE-2021-31196
HIGH ⌖ ON CISA KEV · EXPLOITEDMicrosoft Exchange Server is actively exploited via CVE-2021-31196, enabling remote code execution on unpatched systems.
This vulnerability allows remote attackers to execute arbitrary code on Exchange Server instances, posing a severe risk to DIB organizations relying on Microsoft Exchange for sensitive data. The fact that this CVE is actively exploited in the KEV list indicates widespread, real-world compromise potential, particularly for legacy systems like Exchange 2019 that lack public security updates. DIB orgs must immediately patch affected versions and verify their Exchange infrastructure is not exposed to unauthenticated remote access.
Shame score — Active exploitation of a known RCE vulnerability on a widely deployed product indicates systemic neglect of patch management and legacy system support.
▸ RECOMMENDED ACTION Actively exploited (CISA KEV) — remediate now, ahead of your normal patch cycle.
Microsoft Exchange Server contains an information disclosure vulnerability that allows for remote code execution.
| 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 |