EXPOSURES › CVE-2021-34523
CVE-2021-34523
CRITICAL ⌖ ON CISA KEV · EXPLOITEDA Microsoft Exchange Server vulnerability allowed privilege escalation and was actively exploited in ransomware attacks.
CVE-2021-34523 in Microsoft Exchange Server enabled privilege escalation, which was actively exploited, potentially leading to ransomware deployment. DIB organizations using Exchange Server must immediately patch or mitigate this vulnerability to avoid data breaches and compliance failures (CMMC DF, MP). Older, unsupported versions pose a significant risk.
Shame score — The vulnerability's exploitation in ransomware attacks, coupled with Microsoft's history of Exchange Server vulnerabilities, demonstrates a significant negligence in security 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 privilege escalation.
"Microsoft Exchange Server contains an unspecified vulnerability that allows for privilege escalation."
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| 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 |