CVE-2021-31196
Published: August 21, 2024
Official Description
Microsoft Exchange Server contains an information disclosure vulnerability that allows for remote code execution.
CISA KEV Advisory
Microsoft Exchange Server Information Disclosure Vulnerability
Microsoft Exchange Server contains an information disclosure vulnerability that allows for remote code execution.
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Risk Analysis
Microsoft Exchange Server contains an information disclosure vulnerability that can also lead to remote code execution. This is a high-severity issue with confirmed in-the-wild exploitation, making it a critical threat to Exchange environments.
This vulnerability is actively being exploited in the wild. Attackers can exploit this remotely to achieve code execution.
Apply the latest security updates and cumulative updates for Microsoft Exchange Server to address this information disclosure and remote code execution vulnerability.
Technical Analysis
CVE-2021-31196 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2021-31196 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Affected Vendors & Products
Exploit & PoC Resources
All References (2)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-31196 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1