CVE-2019-0863: Microsoft Windows Error Reporting (WER) Privilege Escalation Vulnerability
- Is it exploited?
Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 3 Nov 2021, 902 days after the CVE record was published.
- How likely is exploitation in the next 30 days?
- 5.2%
EPSS score, percentile 92.5 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 3 May 2022. Apply updates per vendor instructions.
The CVE record links no vendor advisory, patch or mitigation.
- Which versions are affected?
Affected
- 7 for 32-bit Systems Service Pack 1
- 7 for x64-based Systems Service Pack 1
- 8.1 for 32-bit systems
- 8.1 for x64-based systems
- RT 8.1
- 10 for 32-bit Systems
and 22 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: 3 May 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 | 7 for 32-bit Systems Service Pack 1 |
| Affected | 7 for x64-based Systems Service Pack 1 |
| Affected | 8.1 for 32-bit systems |
| Affected | 8.1 for x64-based systems |
| Affected | RT 8.1 |
| Affected | 10 for 32-bit Systems |
| Affected | 10 for x64-based Systems |
| Affected | 10 Version 1607 for 32-bit Systems |
| Affected | 10 Version 1607 for x64-based Systems |
| Affected | 10 Version 1703 for 32-bit Systems |
| Affected | 10 Version 1703 for x64-based Systems |
| Affected | 10 Version 1709 for 32-bit Systems |
And 8 more version entries in the CVE record.
| Status | Versions |
|---|---|
| Affected | 2008 R2 for x64-based Systems Service Pack 1 (Core installation) |
| Affected | 2008 R2 for Itanium-Based Systems Service Pack 1 |
| Affected | 2008 R2 for x64-based Systems Service Pack 1 |
| Affected | 2012 |
| Affected | 2012 (Core installation) |
| Affected | 2012 R2 |
| Affected | 2012 R2 (Core installation) |
| Affected | 2016 |
| Affected | 2016 (Core installation) |
| Affected | version 1803 (Core Installation) |
| Affected | 2019 |
| Affected | 2019 (Core installation) |
| 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
Microsoft Windows Error Reporting (WER) contains a privilege escalation vulnerability due to the way it handles files, allowing for code execution in kernel mode.
Summary: CISA's KEV catalog, as of 28 Oct 2026.
- CISA added CVE-2019-0863 to its Known Exploited Vulnerabilities (KEV) catalog on 3 Nov 2021.
- 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 3 May 2022.
- The CVE record was published on 16 May 2019, 902 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 5.2% (percentile 92.5), 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 Windows Error Reporting (WER) handles files, aka 'Windows Error Reporting Elevation of Privilege Vulnerability'.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
Timeline
| Date | Event |
|---|---|
| 16 May 2019 | CVE record published |
| 3 Nov 2021 | Added to CISA KEV |
| 3 May 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