Is CVE-2018-8581 in the CISA KEV catalog?

Yes. CVE-2018-8581 is on the CISA Known Exploited Vulnerabilities list, added 2022-03-03, and has known ransomware campaign use.

What is the CVSS severity of CVE-2018-8581?

CVE-2018-8581 has a CVSS v3 base score of 7.4 (HIGH).

What is the EPSS score for CVE-2018-8581?

CVE-2018-8581 has an EPSS score of 27.56% (98th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2018-8581

HIGHCISA KEVEPSS 98th pctl

7.4

CVSS v3

NVD

Description

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

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

27.56%probability of exploitation in 30 days

98thpercentile

Very high risk: more likely to be exploited than 98% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Microsoft Exchange Server Privilege Escalation Vulnerability

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.

Apply updates per vendor instructions.

Remediation due: 2022-03-17

Associated with ransomware campaigns

References

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-10-28.