Microsoft · Exchange Server

CVE-2021-31196

Microsoft Exchange Server Information Disclosure Vulnerability

CISA KEV record

NVD risk context

CVSS is a technical severity score. CISA’s KEV status remains the evidence that this vulnerability is known to be exploited.

Attack vector

Network

The vulnerable service can be reached remotely over a network.

Attack complexity

Low

Exploitation does not require unusual conditions beyond normal attacker control.

Privileges required

High

The attacker needs substantial privileges before exploiting the issue.

User interaction

None

No action by another user is required.

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.

NVD reference index

NVD has tagged these sources as vendor advisories, patches, mitigations, or release notes.

Other NVD references (1)

MITRE CWE context

CISA has not listed a CWE classification for this entry.

NVD record timing

These dates describe NVD’s record, not CISA’s KEV addition or remediation due date.

Advanced: view the technical CVSS vector

This standardized code is intended for security tools and technical analysts. The plain-language risk summary above explains its main points.

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2021-31196; https://nvd.nist.gov/vuln/detail/CVE-2021-31196