Overview
Microsoft Exchange Server contains an information disclosure vulnerability that allows for remote code execution.
https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2021-31196; https://nvd.nist.gov/vuln/detail/CVE-2021-31196
Key Details
| Property | Value |
|---|---|
| CVE ID | CVE-2021-31196 |
| Vendor / Product | Microsoft — Exchange Server |
| NVD Published | 2021-07-14 |
| NVD Last Modified | 2025-10-29 |
| CVSS 3.1 Score | 7.2 |
| CVSS 3.1 Vector | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |
| Severity | HIGH |
| CISA KEV Added | 2024-08-21 |
| CISA KEV Deadline | 2024-09-11 |
| Known Ransomware Use | No |
CVSS 3.1 Breakdown
Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Required Action
CISA BOD 22-01 Deadline: 2024-09-11.
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Timeline
| Date | Event |
|---|---|
| 2024-08-21 | Added to CISA Known Exploited Vulnerabilities catalog |
| 2024-09-11 | CISA BOD 22-01 remediation deadline |
References
| Resource | Type |
|---|---|
| NVD — CVE-2021-31196 | Vulnerability Database |
| CISA KEV Catalog Entry | US Government |