CVE-2018-8581

Name: CVE-2018-8581
Creator: NVD / NIST
Published: 2018-11-14T01:29:01.927+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.4/10Actively ExploitedEPSS 27.56%

Last modified Jun 17, 2026

CVE-2018-8581 is a high-severity vulnerability rated 7.4/10 on the CVSS scale. An elevation of privilege vulnerability exists in Microsoft Exchange Server, aka "Microsoft Exchange Server Elevation of Privilege Vulnerability." This affects Microsoft Exchange Server.. CISA has confirmed active exploitation in the wild. EPSS estimates a 27.56% chance of exploitation in the next 30 days.

Description

An elevation of privilege vulnerability exists in Microsoft Exchange Server, aka "Microsoft Exchange Server Elevation of Privilege Vulnerability." This affects Microsoft Exchange Server.

Metrics

CVSS 3.1

7.4/10

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

EPSS Probability

27.56%

97.8th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Mar 17, 2022.

Affected Software

Vendor	Product	Versions
Microsoft	Exchange Server	2010
Microsoft	Exchange Server	2013
Microsoft	Exchange Server	2016
Microsoft	Exchange Server	2019

References

http://www.securityfocus.com/bid/105837Broken Link, Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1042141Broken Link, Third Party Advisory, VDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8581Patch, Vendor Advisory
http://www.securityfocus.com/bid/105837Broken Link, Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1042141Broken Link, Third Party Advisory, VDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8581Patch, Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-8581US Government Resource

Timeline

Published: Nov 14, 2018
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2018-8581?

An elevation of privilege vulnerability exists in Microsoft Exchange Server, aka "Microsoft Exchange Server Elevation of Privilege Vulnerability." This affects Microsoft Exchange Server.

How severe is CVE-2018-8581?

CVE-2018-8581 has a CVSS score of 7.4/10 (HIGH severity). The EPSS model estimates a 27.56% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2018-8581?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-8581?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST