CVE-2020-1027: Microsoft Windows Kernel Privilege Escalation Vulnerability
- Is it exploited?
Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 23 May 2022, 768 days after the CVE record was published.
- How likely is exploitation in the next 30 days?
- 4.7%
EPSS score, percentile 91.8 of all scored records
- How severe?
- 7.8 High
CVSS v3.1 base score, from CISA's enrichment of the record
- What should I do?
CISA deadline 13 Jun 2022. Apply updates per vendor instructions.
The CVE record links no vendor advisory, patch or mitigation.
- Which versions are affected?
Affected
- 10 Version 1803 for 32-bit Systems
- 10 Version 1803 for x64-based Systems
- 10 Version 1803 for ARM64-based Systems
- 10 Version 1809 for 32-bit Systems
- 10 Version 1809 for x64-based Systems
- 10 Version 1809 for ARM64-based Systems
and 26 more in the table below
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
What to do
Required action, set by CISA
Apply updates per vendor instructions.
CISA due date for this action: 13 June 2022.
Advisories and patches
The CVE record links no vendor advisory, patch or mitigation.
Linked from CISA's catalog entry
Affected products and versions
As listed in the CVE record.
| Status | Versions |
|---|---|
| Affected | 10 Version 1803 for 32-bit Systems |
| Affected | 10 Version 1803 for x64-based Systems |
| Affected | 10 Version 1803 for ARM64-based Systems |
| Affected | 10 Version 1809 for 32-bit Systems |
| Affected | 10 Version 1809 for x64-based Systems |
| Affected | 10 Version 1809 for ARM64-based Systems |
| Affected | 10 Version 1709 for 32-bit Systems |
| Affected | 10 Version 1709 for x64-based Systems |
| Affected | 10 Version 1709 for ARM64-based Systems |
| Affected | 10 for 32-bit Systems |
| Affected | 10 for x64-based Systems |
| Affected | 10 Version 1607 for 32-bit Systems |
And 6 more version entries in the CVE record.
| Status | Versions |
|---|---|
| Affected | version 1803 (Core Installation) |
| Affected | 2019 |
| Affected | 2019 (Core installation) |
| Affected | 2016 |
| Affected | 2016 (Core installation) |
| Affected | 2008 for 32-bit Systems Service Pack 2 |
| Affected | 2008 for 32-bit Systems Service Pack 2 (Core installation) |
| Affected | 2008 for Itanium-Based Systems Service Pack 2 |
| Affected | 2008 for x64-based Systems Service Pack 2 |
| Affected | 2008 for x64-based Systems Service Pack 2 (Core installation) |
| Affected | 2008 R2 for Itanium-Based Systems Service Pack 1 |
| Affected | 2008 R2 for x64-based Systems Service Pack 1 |
And 5 more version entries in the CVE record.
| Status | Versions |
|---|---|
| Affected | unspecified |
| Status | Versions |
|---|---|
| Affected | unspecified |
| Status | Versions |
|---|---|
| Affected | unspecified |
| Status | Versions |
|---|---|
| Affected | unspecified |
| Status | Versions |
|---|---|
| Affected | unspecified |
| Status | Versions |
|---|---|
| Affected | unspecified |
| Status | Versions |
|---|---|
| Affected | unspecified |
| Status | Versions |
|---|---|
| Affected | unspecified |
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
About this vulnerability
An elevation of privilege vulnerability exists in the way that the Windows Kernel handles objects in memory. An attacker who successfully exploited the vulnerability could execute code with elevated permissions.
Summary: CISA's KEV catalog, as of 28 Oct 2026.
- CISA added CVE-2020-1027 to its Known Exploited Vulnerabilities (KEV) catalog on 23 May 2022.
- CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
- The due date CISA sets for the required action is 13 Jun 2022.
- The CVE record was published on 15 Apr 2020, 768 days before it was added to KEV.
- The CVE record carries a CVSS v3.1 base score of 7.8 (High), taken from CISA's enrichment of the record.
- FIRST's EPSS model puts the probability of exploitation in the next 30 days at 4.7% (percentile 91.8), as of 28 Oct 2026.
- CISA's SSVC assessment in the CVE record: exploitation active, automatable no, technical impact total.
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.
Description
An elevation of privilege vulnerability exists in the way that the Windows Kernel handles objects in memory, aka 'Windows Kernel Elevation of Privilege Vulnerability'. This CVE ID is unique from CVE-2020-0913, CVE-2020-1000, CVE-2020-1003.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
Weakness
- CWE-787: Out-of-bounds Write
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.
Timeline
| Date | Event |
|---|---|
| 15 Apr 2020 | CVE record published |
| 23 May 2022 | Added to CISA KEV |
| 13 Jun 2022 | CISA due date for the required action |
| 21 Oct 2025 | CVE record last updated |
References
More exploited Microsoft vulnerabilities
- CVE-2026-96951: Microsoft Windows Command Injection Vulnerability
- CVE-2026-65660: Microsoft SharePoint Code Injection Vulnerability
- CVE-2026-81963: Microsoft Windows Link Following Vulnerability
- CVE-2026-85880: Microsoft Windows Heap-Based Buffer Overflow Vulnerability
- CVE-2019-1068: Microsoft SQL Server Remote Code Execution Vulnerability
- CVE-2026-33824: Microsoft Internet Key Exchange (IKE) Service Extensions Double Free Vulnerability