Security readout for executives and security teams
Plain-English summary
CVE-2019-1021 is a Windows Audio Service privilege escalation flaw. An attacker already able to run a crafted local application could gain elevated privileges. It is not described as a standalone remote compromise, but it could make another foothold much more damaging.
Executive priority
Treat as high priority for patch compliance, especially on older Windows endpoints and servers. It does not appear to be a standalone internet-facing emergency from the provided sources, but it can increase the impact of an initial compromise.
Technical view
Microsoft describes an elevation-of-privilege issue in Windows Audio Service request handling. The CVSS 3.1 score is 7.8 with local attack vector, low complexity, low privileges required, no user interaction, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is most likely on unpatched Windows 10 versions 1703, 1709, 1803, 1809, 1903, Windows Server 2019, and listed Server Core builds. Risk depends on patch state and whether an attacker can run local code.
Exploitation context
The bundle does not show CISA KEV listing or cited evidence of active exploitation. Microsoft states exploitation requires running a specially crafted application and may be useful in chains with remote code execution or other privilege escalation flaws.
Researcher notes
No CWE or detailed root cause is provided in the bundle. The key research framing is local post-compromise privilege escalation in Windows Audio Service request handling. Avoid assuming exploit availability or active abuse without additional sourced evidence.
Mitigation direction
- Apply the relevant Microsoft security update for affected Windows builds.
- Confirm unsupported or legacy Windows builds have a vendor-supported upgrade or servicing path.
- Prioritize systems where users or services can execute untrusted local applications.
- Use endpoint controls to limit unauthorized application execution where patching is delayed.
Validation and detection
- Inventory hosts running the affected Windows 10 and Windows Server versions listed by Microsoft.
- Verify the applicable Microsoft update is installed through patch management records.
- Check for remaining unsupported builds that cannot receive normal security servicing.
- Review EDR and software inventory for untrusted local execution on affected hosts.
Public sources used
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
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
Execution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
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-2019-1021 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
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.
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:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C1.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
Source materials
- CVE List V5 sourceCVE List V5
- Windows Audio Service Elevation of Privilege VulnerabilityCVE reference · vendor-advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1021CVE reference · x_refsource_MISC, x_transferred
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.