CWE-1296: Incorrect Chaining or Granularity of Debug Components

BaseIncomplete

The product's debug components contain incorrect chaining or granularity of debug components.

View on MITRE
Back to CWE Lookup

Extended Description

For debugging and troubleshooting a chip, several hardware design elements are often implemented, including: Various Test Access Ports (TAPs) allow boundary scan commands to be executed. For scanning the internal components of a chip, there are scan cells that allow the chip to be used as a "stimulus and response" mechanism. Chipmakers might create custom methods to observe the internal components of their chips by placing various tracing hubs within their chip and creating hierarchical or interconnected structures among those hubs. Logic errors during design or synthesis could misconfigure the interconnection of the debug components, which could allow unintended access permissions.

Technical Details

Structure
Simple
Vulnerability Mapping
ALLOWED

Applicable To

Languages
VerilogVHDLNot Language-Specific
Platforms
Not OS-Specific

Source-backed guidance

Additional facts reviewed against primary or authoritative security sources.

Detect imprecise mappings involving CWE-1296

Review mappings to CWE-1296, Incorrect Chaining or Granularity of Debug Components, with MITRE's mapping and navigation criteria. Flag any selection that points to a View or Category, remains at a higher abstraction than the available evidence supports, or ignores relevant parent, child, peer, and alternative entries. Treat those findings as mapping-quality defects, correct them before publication, and retain the comparison trail for repeatable audits.

CWE Mapping and Navigation Guidance — MITRE CWE

Prevent CWE-1296 through an SSDF control plan

Use NIST SSDF practices to make prevention of CWE-1296, Incorrect Chaining or Granularity of Debug Components, an explicit development outcome. Translate the CWE definition into security requirements and design constraints, choose safer implementation patterns and toolchain checks, and define acceptance evidence before release. Feed every confirmed occurrence back into the requirements, design review, and coding rules so the same root cause is removed across the product rather than patched in one location.

NIST SP 800-218 Secure Software Development Framework — National Institute of Standards and Technology

Triage CWE-1296 against known exploitation evidence

Use CISA's Known Exploited Vulnerabilities catalog to test whether a vulnerability mapped to CWE-1296, Incorrect Chaining or Granularity of Debug Components, has evidence of exploitation in the wild. Confirm the CVE-to-CWE root-cause mapping independently before attaching the example, then capture the affected product, required action, and remediation deadline. A missing KEV match is not evidence that the weakness is unexploited, and a KEV entry must not be generalized to every occurrence of this CWE.

Known Exploited Vulnerabilities Catalog — Cybersecurity and Infrastructure Security Agency

Place CWE-1296 in the CWE Research Concepts hierarchy

Use the CWE-1000 Research Concepts view to locate CWE-1296, Incorrect Chaining or Granularity of Debug Components, within its broader and narrower weakness hierarchy. Compare neighboring entries and select the most precise root cause supported by evidence. Use parent concepts for program-level analysis and child or variant entries for actionable finding-level mappings, without treating the view itself as a vulnerability.

CWE-1000: Research Concepts — MITRE CWE

Validate debug-chain authorization boundaries after silicon implementation

An incorrectly flattened or chained hierarchy of JTAG test access ports can expose internal debug components to lower-privileged users. Preserve component granularity at each authorization level and perform post-silicon validation at multiple authorization levels to confirm that only authorized users can reach each component.

CAPEC-702: Exploiting Incorrect Chaining or Granularity of Hardware Debug Components — MITRE CAPEC

Frequently Asked Questions

What is CWE-1296: Incorrect Chaining or Granularity of Debug Components?+

CWE-1296: Incorrect Chaining or Granularity of Debug Components is a Common Weakness Enumeration (CWE) entry maintained by MITRE. The product's debug components contain incorrect chaining or granularity of debug components. For debugging and troubleshooting a chip, several hardware design elements are often implemented, including: Various Test Access Ports (TAPs) allow boundary scan commands to be executed. For scanning the internal components of a chip, there are scan cells that allow the chip to be used as a "stimulus and response" mechanism. Chipmakers might create custom methods to observe the internal components of their chips by placing various tracing hubs within their chip and creating hierarchical or interconnected structures among those hubs. Logic errors during design or synthesis could misconfigure the interconnection of the debug components, which could allow unintended access permissions.

What are the security consequences of Incorrect Chaining or Granularity of Debug Components?+

If exploited, CWE-1296 (Incorrect Chaining or Granularity of Debug Components) it can compromise Confidentiality, Integrity, Access Control, Authentication, Authorization and Availability, leading to outcomes such as Gain Privileges or Assume Identity, Bypass Protection Mechanism, Execute Unauthorized Code or Commands, Modify Memory and Modify Files or Directories.

How do you prevent or mitigate Incorrect Chaining or Granularity of Debug Components?+

Recommended mitigations for CWE-1296 include: Ensure that debug components are properly chained and their granularity is maintained at different authentication levels.

How is Incorrect Chaining or Granularity of Debug Components detected?+

CWE-1296 can be detected using Architecture or Design Review and Dynamic Analysis with Manual Results Interpretation. Combining automated tooling with manual review typically yields the best coverage.

Which programming languages are affected by Incorrect Chaining or Granularity of Debug Components?+

CWE-1296 commonly affects Verilog, VHDL and Not Language-Specific. Note that weaknesses are often language-agnostic patterns, so secure coding practices apply broadly.

What are real-world examples of Incorrect Chaining or Granularity of Debug Components?+

MITRE documents real CVEs mapped to CWE-1296, including CVE-2017-18347 and CVE-2020-1791. You can look up the full details of each CVE, including CVSS scores and remediation guidance, on our CVE Lookup tool.

What is the difference between a CWE and a CVE?+

A CWE (Common Weakness Enumeration) like CWE-1296 describes a category of software weakness — the underlying flaw type. A CVE (Common Vulnerabilities and Exposures) identifies a specific, real-world vulnerability in a particular product. In short, a CWE is the kind of mistake, and a CVE is an instance of that mistake being found in software.

Learn More

Find Related CVEs

Search for vulnerabilities that exploit CWE-1296

CVE vs CWE: What's the Difference?

Understanding vulnerabilities vs weaknesses

Understanding CVSS Scoring

How vulnerability severity is measured

View Full MITRE Entry

Complete technical details and references

Advertisement