Security readout for executives and security teams
CVE-2018-8639 is a Windows privilege escalation flaw in Win32k memory object handling. An attacker with local execution could gain higher privileges on many Windows desktop and server versions. CISA lists it in KEV, so exploitation is known, not just theoretical. Exposure is likely where affected Windows 7, 8.1, 10, Server 2008, 2012, 2016, 2019, RT 8.1, or Server Core systems remain unpatched. Legacy and unsupported hosts are the highest concern. Treat this as urgent for any affected Windows estate because it is KEV-listed and impacts core operating-system privilege boundaries. It is not a remote entry point by itself, but it can turn a limited foothold into full host compromise. Mitigation focus: Prioritize remediation on affected Windows servers, endpoints, and Server Core systems.; Use the MSRC advisory to identify and deploy applicable Microsoft security updates.; Retire or isolate legacy Windows versions that cannot receive applicable updates..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CWE-404: Exact CWE lookup
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Open ATT&CK lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2018-8639 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 8.4 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CISA KEV status
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H2.55.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.4HighVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8639CVE reference · x_refsource_CONFIRM
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-8639CVE reference · government-resource
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Resource Shutdown or Release
Improper Resource Shutdown or Release represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.