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Microsoft · Exchange Server

CVE-2018-8581

Microsoft Exchange Server Privilege Escalation Vulnerability

CISA KEV record

CISA date added
2022-03-03
CISA due date
2022-03-17
Known ransomware use
Known

NVD risk context

7.4 HIGH

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

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Attack vector
Network
The vulnerable service can be reached remotely over a network.
Attack complexity
High
Exploitation depends on conditions outside the attacker’s direct control.
Privileges required
None
The attacker does not need an existing account or privileges.
User interaction
None
No action by another user is required.

Description

A privilege escalation vulnerability exists in Microsoft Exchange Server. An attacker who successfully exploited this vulnerability could attempt to impersonate any other user of the Exchange server.

Required action

Apply updates per vendor instructions.

NVD reference index

Vendor and remediation references

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

Other NVD references (3)

MITRE CWE context

CWE classification

CISA has not listed a CWE classification for this entry.

NVD record timing

NVD record timeline

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

NVD published
Nov 14, 2018, 01:29 AM UTC
When NVD first published this CVE record.
NVD last updated
Jun 17, 2026, 02:05 AM UTC
When NVD last changed its analysis or record data.
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:H/PR:N/UI:N/S:U/C:H/I:H/A:N

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CISA notes

https://nvd.nist.gov/vuln/detail/CVE-2018-8581