CVE-2018-8581
CVE-2018-8581 is a high-severity vulnerability in Microsoft Exchange Server with a CVSS 3.x base score of 7.4. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2022-03-03).
Key facts
- Severity: High (CVSS 3.x base score 7.4)
- CVSS v2: 5.8
- EPSS exploit prediction: 28% (98th percentile)
- Actively exploited: Yes — listed in CISA KEV (added 2022-03-03)
- EU (EUVD) id: EUVD-2018-20198
- EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2022-03-03)
- Affected product: Microsoft Exchange Server
- Published:
- Last modified:
Description
An elevation of privilege vulnerability exists in Microsoft Exchange Server, aka "Microsoft Exchange Server Elevation of Privilege Vulnerability." This affects Microsoft Exchange Server.
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 3.x base score of 7.4, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
- Is CVE-2018-8581 being actively exploited?
- Yes. CVE-2018-8581 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-03-03, which means active exploitation has been confirmed. It should be prioritised for remediation.
- What products are affected by CVE-2018-8581?
- CVE-2018-8581 primarily affects Microsoft Exchange Server. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2018-8581?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
- Does CVE-2018-8581 have an EU (EUVD) identifier?
- Yes. CVE-2018-8581 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2018-20198. It is also flagged as exploited in the EUVD (since 2022-03-03).
- When was CVE-2018-8581 published?
- CVE-2018-8581 was published on 2018-11-14 and last updated on 2026-06-17.
References
- http://www.securityfocus.com/bid/105837
- http://www.securitytracker.com/id/1042141
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8581
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-8581
Affected products (4)
- cpe:2.3:a:microsoft:exchange_server:2010:-:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2013:-:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2016:-:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2019:-:*:*:*:*:*:*
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