Security readout for executives and security teams
Plain-English summary
CVE-2021-24103 is a Microsoft Windows Event Tracing privilege escalation flaw. It does not appear to be remotely exploitable by itself; an attacker needs local low-privileged access. If abused, it could let that attacker gain broader control of an affected Windows system.
Executive priority
Handle as a high-priority patching issue, especially for systems where low-privileged compromise could lead to administrative control. It is less urgent than confirmed exploited remote vulnerabilities, but it materially increases breach impact after initial access.
Technical view
The source describes a Windows Event Tracing elevation-of-privilege vulnerability with CVSS 3.1 score 7.8. The vector is local, low complexity, low privileges required, no user interaction, unchanged scope, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is likely on unpatched affected Windows client and server versions listed by Microsoft, including Windows 10 versions, Windows Server 2008 through 2019 variants, Windows 7, and Windows 8.1. Internet-facing status is not the key factor because local access is required.
Exploitation context
The bundle does not cite active exploitation, and KEV status is false. The CVSS temporal metric lists exploit maturity as unproven. Treat this mainly as a post-compromise or insider-risk privilege escalation issue unless newer vendor intelligence says otherwise.
Researcher notes
Public details in the bundle are sparse. The key confirmed facts are Windows Event Tracing EoP, local attack vector, low privilege requirement, high impact, official remediation availability, and no KEV listing. Avoid assuming exploit availability or affected builds beyond cited Microsoft data.
Mitigation direction
- Review Microsoft MSRC guidance for applicable security updates.
- Patch affected supported Windows systems through normal Microsoft update channels.
- Prioritize shared servers, admin workstations, and high-value endpoints.
- Replace, isolate, or tightly control unsupported Windows versions.
- Limit local account privileges until patch status is verified.
Validation and detection
- Inventory Windows versions against the affected product list.
- Confirm installed updates match the MSRC advisory requirements.
- Identify unsupported Windows hosts needing compensating controls.
- Review endpoint management reports for patch failures or missing coverage.
- Check privileged workstation and server patch compliance first.
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.
Privilege 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-2021-24103 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:U/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:U/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:U/RL:O/RC:C
Source materials
- CVE List V5 sourceCVE List V5
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-24103CVE reference · x_refsource_MISC
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.