Security readout for executives and security teams
Plain-English summary
This Azure Sphere flaw could allow unsigned code to run on a device, weakening a core security boundary and potentially compromising data, device behavior, and availability. Its critical score warrants urgent attention, although the assessed attack path requires local access rather than direct remote access.
Executive priority
Treat as urgent where Azure Sphere is deployed because successful exploitation could fully compromise affected devices. Prioritize inventory and vendor-update verification, while recognizing that local access is required and active exploitation is not established by the supplied evidence.
Technical view
CVE-2021-27080 is an Azure Sphere unsigned code execution vulnerability rated CVSS 9.3. The vector indicates local access, low complexity, no privileges, no user interaction, changed scope, and high confidentiality, integrity, and availability impact. The supplied evidence does not identify affected versions or technical root cause.
Likely exposure
Exposure is limited to Azure Sphere deployments. The CVSS vector indicates an attacker needs local access but requires no existing privileges or user interaction. Because affected versions are unspecified, organizations cannot complete version-based scoping from this source bundle alone.
Exploitation context
Active exploitation is not established. The CVE is not listed as KEV, and the supplied bundle contains no claim of exploitation in the wild. A public Talos vulnerability report is referenced, but its technical contents are not included in the bundle.
Researcher notes
The changed-scope CVSS assessment suggests impact may cross a security boundary, but the bundle does not explain that boundary, root cause, affected versions, or remediation mechanics. Consult the Microsoft and Talos references for those details before drawing deeper technical conclusions.
Mitigation direction
- Inventory Azure Sphere devices and record their software and security-update status.
- Review Microsoft’s CVE guidance and apply the vendor-provided update applicable to each deployment.
- Restrict unnecessary physical and local access until remediation is confirmed.
- Monitor Microsoft guidance for affected-version and remediation details absent from this bundle.
Validation and detection
- Confirm whether Azure Sphere is present in production, laboratory, development, or field environments.
- Compare each device’s version and update status against Microsoft’s current advisory.
- Verify the applicable Microsoft remediation is installed across all identified devices.
- Review device telemetry for unexplained code execution or unexpected security-state changes.
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 lookupCVE-2021-27080 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
- Critical
- CVSS
- 9.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/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:N/UI:N/S:C/C:H/I:H/A:H2.56microsoftVulnerability scoring details
Base CVSS 3.1 score
9.3CriticalVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- Azure Sphere Unsigned Code Execution VulnerabilityCVE reference, microsoft · vendor-advisory, patch
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-27080CVE reference, CVE · x_refsource_MISC, x_transferred
- https://www.talosintelligence.com/vulnerability_reports/TALOS-2021-1250CVE reference, CVE · 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.