Who should be responsible for reviewing findings in third-party binaries and firmware audits?

Why This Matters for Security Teams

Third-party binaries and firmware are not just software supply chain artifacts; they can carry hidden functionality, embedded secrets, weak update paths, and privilege-bearing behaviors that are easy to miss in routine vendor review. The review question matters because findings often cross team boundaries: reverse engineers may spot code-level abuse, AppSec may understand exploitability, and product security leads may know which control owners can actually remediate. The practical risk is amplified by the fact that 92% of organisations expose NHIs to third parties, raising supply chain exposure, and NHI Mgmt Group’s Ultimate Guide to NHIs — Key Challenges and Risks shows how often identity-related risk enters through external dependencies. The right reviewer is the one who can translate a binary finding into a business decision, not just a technical note. Current guidance also aligns with the OWASP Non-Human Identity Top 10 and the NIST Cybersecurity Framework 2.0, both of which emphasise ownership, governance, and risk-based response. In practice, many security teams encounter missed firmware exposure only after an incident review or procurement exception has already been approved.

How It Works in Practice

Responsibility should be assigned by finding type, system criticality, and the reviewer’s ability to act on the result. For stripped binaries, the first pass usually belongs to reverse engineers or product security specialists because they can determine whether a pattern is benign, suspicious, or evidence of hardcoded trust. For embedded firmware, reviewers also need to assess update mechanisms, signing trust, and whether the device can be patched without business disruption. The best operating model is a triage chain: technical analyst, security owner, then system or product owner for remediation decisions.

A practical review workflow often looks like this:

• Technical teams validate the finding and confirm whether it is real, exploitable, and in scope.
• AppSec or product security maps the issue to severity, attack path, and compensating controls.
• Asset or product owners decide whether to replace, patch, isolate, or accept the risk.
• Governance records the decision, especially when a third-party component cannot be recompiled or re-signed.

This is also where NHI controls matter. If a binary or firmware package embeds secrets, API keys, or update credentials, the response should align with lifecycle and rotation discipline described in Ultimate Guide to NHIs — Regulatory and Audit Perspectives and the NHI Lifecycle Management Guide. At the control level, NIST SP 800-53 Rev. 5 supports documented assessment, vulnerability handling, and system accountability, while the NIST framework encourages repeatable governance rather than ad hoc escalation. These controls tend to break down when the component is vendor-locked, the firmware is unsigned, or the organisation has no clear owner for accepting third-party risk.

Common Variations and Edge Cases

Tighter review gates often increase turnaround time and vendor friction, requiring organisations to balance deeper assurance against delivery and procurement pressure. That tradeoff becomes especially visible when a binary is stripped, a firmware image is proprietary, or the supplier refuses to provide symbols, SBOM data, or reproducible builds. Current guidance suggests that ownership should still sit with the team closest to the risk, but the exact reviewer may shift depending on whether the issue is cryptographic, exploit-development oriented, or operationally disruptive.

One common edge case is when a finding is technically severe but operationally hard to confirm. In those situations, reverse engineers may need to document evidence thresholds and hand off to the business owner for decision-making. Another is when firmware touches safety, industrial control, or regulated environments, where product security and OT security may both need to sign off. The lesson from incidents such as the LiteLLM PyPI package breach and the Reviewdog GitHub Action supply chain attack is that external code can carry hidden identity and trust risk long before a user ever installs or runs it. Where there is no universal standard yet, the safest practice is to require a named technical reviewer, a named business owner, and a written disposition for every unresolved binary or firmware finding.

Related resources from NHI Mgmt Group

• How should security teams limit blast radius when a third-party needs IAM permissions in AWS?
• How should security teams govern third-party app access to cloud accounts in a zero trust model?
• How should security teams govern third-party apps that employees adopt without a formal security review?
• Who is accountable for the security of third-party integrations when business teams can adopt apps directly?