Most of the code running in your product probably isn’t code you wrote. Open source libraries, vendor SDKs, and firmware components all become part of your attack surface the moment they’re compiled into your build.
Third-party software risk is the potential for vulnerabilities, operational failures, or compliance issues to enter your systems through code your organization didn’t develop. This article covers the specific risks, why they’re intensifying, and practical approaches to visibility, mitigation, and long-term management for embedded and critical systems.
What Is Third-Party Software Risk
Third-party software risk is the potential for security vulnerabilities, operational failures, or compliance issues to enter your product through code you didn’t write. Every open source library, commercial SDK, firmware component, and external API you integrate becomes part of your attack surface, and you inherit whatever weaknesses that code contains.
The tricky part? You often have limited visibility into what’s actually inside third-party components. A single embedded device might contain hundreds of dependencies, each with its own history of vulnerabilities and maintenance practices.
Common sources include:
- Open source libraries: Code packages maintained by external communities, often with varying levels of security oversight
- Commercial SDKs: Proprietary tools licensed from vendors, where you typically don’t have access to source code
- Firmware components: Low-level software embedded in hardware, frequently written in C/C++
- Third-party APIs: External services your software calls at runtime
It’s worth noting that third-party software risk differs from broader “vendor risk.” Vendor risk covers organizational concerns like a supplier’s financial stability or contractual compliance. Third-party software risk is specifically about the code itself and what vulnerabilities it carries into your product.
Why Third-Party Software Risk Is Growing
Increasing Dependence on Open Source and Third-Party Components
Modern software contains far more third-party code than custom-written code. Embedded systems especially rely on open source C/C++ libraries—some of which are decades old and predate modern security practices.
You might have hundreds of dependencies in a single product. Each one represents potential exposure, and tracking them manually doesn’t scale.
Expanding Regulatory Requirements for Software Supply Chain Security
Regulators now explicitly require documented Software Bills of Materials (SBOMs) and vulnerability tracking. An SBOM is a formal record of every component in a build.
The FDA’s premarket cybersecurity guidance, NIST’s Secure Software Development Framework (SSDF), and the EU Cyber Resilience Act all mandate visibility into software components. For teams building medical devices, automotive systems, or defense products, compliance depends on knowing exactly what’s in your software.
Rising Memory Safety Exploits in Third-Party Code
Memory safety vulnerabilities—buffer overflows, use-after-free bugs, out-of-bounds writes—remain among the most exploited weakness types. CISA’s Known Exploited Vulnerabilities (KEV) catalog, which tracks vulnerabilities actively used by attackers, shows memory safety issues are consistently targeted.
C/C++ code dominates embedded systems, and it’s particularly susceptible to memory safety problems. For devices that run for 10-20 years and can’t easily be patched, a memory safety flaw in a third-party library becomes a long-term liability.
Six Common Third-Party Software Security Risks
1. Memory Safety Vulnerabilities in Compiled Code
Weaknesses like CWE-787 (out-of-bounds write) and CWE-416 (use-after-free) appear in MITRE’s Top 25 Most Dangerous Software Weaknesses. When exploited, attackers can achieve arbitrary code execution or complete system takeover.
For embedded devices, exploitation often means an attacker gains control of physical systems—not just data.
2. Known Vulnerabilities in Third-Party Dependencies
A CVE (Common Vulnerabilities and Exposures) is a publicly disclosed security flaw with a unique identifier. Attackers actively scan for systems running components with known CVEs, and automated tools make this reconnaissance trivial.
The challenge is that many teams don’t have accurate inventories of their dependencies. Without knowing what’s in your build, you can’t determine your exposure when a new CVE drops.
3. Supply Chain Attacks and Malicious Code Injection
Attackers sometimes insert malicious code directly into legitimate packages, targeting the build or distribution pipeline rather than the end product. The XZ Utils backdoor discovered in 2024 demonstrated how a trusted open source project could be compromised over time through social engineering of maintainers.
4. Insecure APIs and Data Exposure
Third-party integrations may leak sensitive data through poor encryption, excessive permissions, or verbose logging. Even if your code is secure, a poorly implemented external API can create exposure you didn’t anticipate.
5. Outdated or Unmaintained Software Components
Libraries get abandoned by maintainers. Embedded systems with long lifecycles often run components that no longer receive security updates. When a vulnerability is discovered in unmaintained code, patching may simply not be an option. The maintainer has moved on, and you’re left with vulnerable code baked into your product.
6. Open Source License Compliance Violations
Beyond security, there’s legal risk from open source compliance violations. GPL, LGPL, and Apache licenses carry different obligations around attribution, source code disclosure, and derivative works. Non-compliance can result in litigation, forced code disclosure, or product recalls.
Business Liability for Third-Party Software Vulnerabilities
Device manufacturers and software providers are liable for vulnerabilities in products they ship, regardless of whether they wrote the vulnerable code. Regulators and courts don’t distinguish between your code and third-party code when assessing responsibility.
Procurement is shifting too. Customers increasingly require SBOMs and security attestations before purchasing. Insurance underwriters are asking about software supply chain practices. The question “what’s in your software?” now has contractual and financial consequences.
Why Visibility Is the Foundation of Third-Party Security
Challenges of Identifying Third-Party Components in C and C++ Codebases
Traditional SBOM tools struggle with compiled languages. Unlike JavaScript or Python, C/C++ projects don’t have standardized manifest files that list dependencies. Code is often statically linked or copied directly into projects, making it invisible to conventional scanners.
Many teams discover their component inventories are incomplete or inaccurate, which means their vulnerability assessments are too. You can’t protect what you can’t see.
How Build-Time SBOMs Improve Accuracy Over Traditional Tools
Build-time SBOM generation observes actual compilation to capture what’s truly included in the binary. Rather than scanning source directories or guessing based on file names, build-time analysis watches the compiler and linker to record exactly which files become part of your product.
The difference matters. An incomplete SBOM creates false confidence about your security posture. You think you’ve assessed your risk, but you’ve only assessed part of it.
Connecting Component Visibility to Vulnerability Prioritization
Once you have an accurate SBOM, you can map components to CVE databases automatically. However, not all vulnerabilities warrant immediate action.
Prioritization depends on:
- Exploitability: Does the vulnerability have a high CVSS score? Is it listed in CISA’s KEV catalog?
- Reachability: Is the vulnerable code actually executed in your product, or is it dead code?
- Business impact: What happens if this component is compromised?
Visibility enables risk-based decisions rather than panic-driven responses to every new CVE announcement.
How to Mitigate Third-Party Software Risk
1. Generate Accurate Software Bills of Materials at Build Time
Start with a complete inventory. For C/C++ codebases, build-time approaches typically outperform scanning tools because they observe what actually gets compiled into the binary.
2. Prioritize Vulnerabilities Based on Exploitability and Business Impact
Use CVSS scores and the KEV catalog to identify which vulnerabilities attackers are actually exploiting. Focus resources on issues that are both exploitable and present in critical code paths. Not every CVE requires an emergency response.
3. Implement Runtime Protection for Memory Safety Vulnerabilities
For vulnerabilities that can’t be patched—legacy code, unavailable source, long certification cycles—runtime protection provides defense. Techniques like memory layout randomization reduce exploitability even when the underlying vulnerability remains in the code.
4. Establish Third-Party Vendor Risk Assessment Processes
Evaluate vendors before onboarding. Ask about their security practices, update cadence, and incident response capabilities. Request SBOMs from suppliers as part of procurement. If they can’t tell you what’s in their software, that’s a red flag.
5. Automate Continuous Third-Party Monitoring and Alerting
Vulnerabilities are disclosed constantly. Manual tracking doesn’t scale when you have hundreds of components across multiple products. Automated monitoring tools can alert you when new CVEs affect components in your inventory.
6. Plan Protection Strategies for Legacy and Long-Lifecycle Systems
Embedded systems may run for decades. Plan for scenarios where patching is impossible. Compensating controls, network segmentation, and runtime hardening become essential when you can’t update the code itself.
Building an Effective Third-Party Cybersecurity Risk Management Framework
Aligning with Industry Standards and Compliance Requirements
Compliance standards and frameworks like NIST Cybersecurity Framework, ISO 27001, and IEC 62443 (for industrial systems) provide structure and satisfy auditors. Choose standards relevant to your industry and regulatory environment rather than trying to implement everything at once.
Defining Roles and Responsibilities for Third-Party Oversight
Third-party risk often falls between security, engineering, procurement, and legal teams. Without clear accountability, gaps emerge. Product security teams typically coordinate across functions, but someone has to own the overall program.
Integrating Third-Party Risk Management into the Software Development Lifecycle
Assess third-party components during development, not after release. Include SBOM generation in CI/CD pipelines so it happens automatically with every build. When security is part of the build process, it doesn’t slow releases and prevents costly rework later.
Third-Party Software Risk Trends for 2026
Memory Safety Regulations and Government Mandates
The White House has called for adoption of memory-safe languages. CISA continues emphasizing memory safety in its guidance. Organizations using C/C++ face increasing scrutiny, and those who can’t migrate will likely be expected to demonstrate compensating controls.
AI-Generated Code Creating New Third-Party Risks
Code from large language models may contain vulnerabilities, outdated patterns, or even copyrighted snippets. AI-generated code is effectively third-party code with unknown provenance—you didn’t write it, and you don’t know where the training data came from. Validation processes are becoming essential.
Embedded and Critical Infrastructure Systems as Primary Targets
Attackers increasingly target OT/ICS and embedded devices. Embedded systems are harder to patch and have safety implications beyond data breach. Third-party risk in embedded systems carries operational consequences that enterprise IT rarely faces. When a medical device or industrial controller is compromised, the impact is physical.
Reducing Third-Party Risk Exposure in Embedded Software
Embedded software presents unique challenges: long lifecycles, compiled code, limited patching ability, and safety-critical operation. Effective third-party risk management for embedded systems combines visibility (accurate SBOMs), protection (runtime hardening), and monitoring (crash analysis for potential exploits).
Request a consultation to learn more about how RunSafe helps organizations address third-party software risks.
