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CVE-2021-34387: The ARM TrustZone Technology on which Trusty is based on contains a vulnerability in access permission sett...

The ARM TrustZone Technology on which Trusty is based on contains a vulnerability in access permission settings where the portion of the DRAM reserved for TrustZone is identity-mapped by TLK with read, write, and execute permissions, which gives write access to kernel code and data that is otherwise mapped read only.

MediumCVSS 6.3Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-34387 affects NVIDIA Jetson TX1 systems running Jetson Linux before r32.5.1. A TrustZone memory permission weakness could let already highly privileged local activity modify kernel code or data that should be read-only. Business urgency is moderate because prerequisites are restrictive, but compromised embedded devices can be difficult to detect and recover.

Executive priority

Treat this as a scheduled remediation item for Jetson TX1 fleets, with higher urgency for devices in exposed, shared, or hard-to-monitor environments. The issue is not reported as actively exploited in the supplied sources, but the potential impact after prerequisite access is severe.

Technical view

TLK identity-maps TrustZone-reserved DRAM with read, write, and execute permissions. That permission model can expose kernel code and data that should otherwise be read-only. The CVSS 3.1 score is 6.3, with local access, high complexity, high privileges, and user interaction required, but confidentiality, integrity, and availability impacts are high.

Likely exposure

Exposure is limited by the supplied sources to NVIDIA Jetson TX1 devices running any Jetson Linux version before r32.5.1. The bundle does not identify other affected products or versions, so do not broaden scope without vendor confirmation.

Exploitation context

The source bundle does not show CISA KEV listing or other evidence of active exploitation. CVSS indicates exploitation requires local access, high privileges, high complexity, and user interaction, which lowers likelihood but does not remove risk on shared, fielded, or physically accessible devices.

Researcher notes

Scope is narrow in the bundle: NVIDIA Jetson TX1 before Jetson Linux r32.5.1. No CWE, exploit details, or broader product impact are provided. Validation should focus on version confirmation and vendor advisory alignment, not speculative TrustZone testing.

Mitigation direction

  • Inventory NVIDIA Jetson TX1 devices and record Jetson Linux versions.
  • Update affected devices to Jetson Linux r32.5.1 or later.
  • Review the NVIDIA advisory before deployment for product-specific guidance.
  • Restrict local administrative access until remediation is complete.
  • Track NVIDIA updates for any revised affected-version or mitigation guidance.

Validation and detection

  • Confirm each Jetson TX1 reports Jetson Linux r32.5.1 or later.
  • Compare asset inventory against known Jetson TX1 deployments.
  • Verify update status through normal device management records.
  • Review access controls for local privileged users on affected devices.
  • Document any unpatchable devices and compensating controls.
Prepared
Confidence
high
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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

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CVE-2021-34387 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
6.3 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H

Official CVE source material

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.

1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We 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.

ScoreVersionSeverityVectorExploitImpactSource
6.3CVSS 3.1MediumCVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H0.35.9Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

6.3Medium
CVSS 3.1 vector shape for CVE-2021-34387Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
NVIDIANVIDIA Jetson TX1All Jetson Linux versions prior to r32.5.1Listed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.