Security readout for executives and security teams
Plain-English summary
This Intel AMT flaw affects systems running AMT firmware below specific vendor-listed versions. It requires local access, high privileges, and user interaction, so it is not a broad internet-facing emergency. The business concern is that an already privileged local user could gain stronger control over system integrity or availability.
Executive priority
Treat this as high priority for managed endpoints with AMT enabled, especially privileged-user workstations. It is less urgent than a remotely exploitable flaw, but delaying firmware remediation can increase impact after local compromise.
Technical view
CVE-2021-33159 is CWE-287 improper authentication in an Intel AMT subsystem. The CVSS 3.1 vector is AV:L/AC:L/PR:H/UI:R/S:C/C:N/I:H/A:H, scoring 7.4. Affected AMT branches are those before 11.8.93, 11.22.93, 11.12.93, 12.0.92, 14.1.67, 15.0.42, and 16.1.25.
Likely exposure
Exposure is most likely on managed endpoint fleets, workstations, or servers with Intel AMT enabled and running older AMT versions. Systems without Intel AMT, or already at the listed versions or later, are not indicated as affected in the provided data.
Exploitation context
The source bundle does not identify public exploitation or CISA KEV listing. Exploitation requires local access, high privileges, and user interaction, which reduces external threat likelihood but keeps insider, post-compromise, and shared-admin scenarios relevant.
Researcher notes
The issue is authentication-related, but the public bundle does not provide subsystem internals, proof-of-concept details, or alternate mitigations. Avoid assuming remote exposure. Focus validation on AMT version enumeration, local privilege boundaries, and firmware update status.
Mitigation direction
- Inventory systems with Intel AMT enabled and record exact AMT versions.
- Update affected AMT branches to the listed fixed versions or later.
- Prioritize devices used by administrators or high-value business functions.
- Restrict local privileged access on systems until updates are confirmed.
- Review Intel advisory INTEL-SA-00610 for environment-specific guidance.
Validation and detection
- Confirm whether Intel AMT is present and enabled on each asset.
- Compare AMT versions against the affected version thresholds.
- Verify updated systems report fixed or later AMT versions.
- Check exception lists for devices unable to receive firmware updates.
- Document compensating controls for deferred remediation.
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.
CWE-287: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-33159 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
- 7.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:N/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.
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:H/UI:R/S:C/C:N/I:H/A:H1.15.8Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.4HighVector: CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:N/I:H/A:H
Source materials
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 Authentication
Improper Authentication represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.