CVE-2021-31196
KEVMicrosoft Exchange Server Information Disclosure Vulnerability
Description
Microsoft Exchange Server contains an information disclosure vulnerability that allows for remote code execution.
Microsoft Exchange Server Remote Code Execution Vulnerability
CVSS 3.1 vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:HPublishedJul 14, 2021
Last modifiedAug 10, 2026
Added to KEVAug 21, 2024
Remediation dueSep 11, 2024
References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2021-31196PatchVendor Advisory
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31196PatchVendor Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-31196US Government Resource
0 recent articles mention this CVE
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Risk assessment · High
Actively exploited. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 776 days
- CVSS
- 7.2 HIGH
- EPSS (30-day exploit probability)
- 54.1% · top 1% of all CVEs
- Weakness
- NVD-CWE-noinfo
- Attack vector
- Network, remotely reachable
Recommended actions
- 1.Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Review exposure: confirm which instances are reachable from the internet and restrict access until patched.
- 4.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.