As reported by CISA, a new joint guidance document co-authored with the NSA and international cybersecurity partners outlines best practices for establishing Coordinated Vulnerability Disclosure (CVD) programs. While the document itself is a valuable resource, its very necessity reveals something more troubling — a large segment of the software industry still operates without any structured mechanism for receiving, triaging, or acting on externally reported vulnerabilities.

Key Insight: As reported by CISA, a new joint guidance document co-authored with the NSA and international cybersecurity partners outlines best practices for establishing Coordinated Vulnerability Disclosure (CVD) programs.

Why This Matters More Than It Appears

CVD programs are not a luxury or a compliance checkbox. They are foundational infrastructure for the modern threat landscape. Security researchers — both independent and affiliated — routinely discover critical flaws before threat actors do. Without a functioning CVD program, vendors create a dangerous vacuum: researchers who find vulnerabilities have nowhere to report them responsibly, which increases the likelihood of public disclosure, underground sale, or quiet exploitation.

The joint guidance arrives at a moment when the attack surface across software-as-a-service platforms, embedded systems, and open-source dependencies has never been broader. A vendor without a CVD program in 2025 is not just behind the curve — they are actively contributing to systemic risk across their entire customer base.

The Researcher Relationship Problem

One of the most underappreciated dimensions of CVD programs is the human element. Security researchers frequently report frustration with vendors who ignore submissions, respond with legal threats, or fail to acknowledge reports for months. This erodes the trust that makes the entire ecosystem function. When researchers feel unwelcome or unsafe, they disengage — and vulnerabilities go unreported or get disclosed in ways that benefit attackers.

Shield53 Perspective: A Vulnerability Disclosure Policy (VDP) is a public commitment. It signals to researchers that your organization is a trustworthy partner, not an adversary. That signal has measurable security value.

The guidance's emphasis on leveraging third-party intermediaries — such as CISA itself or national CSIRTs — is particularly practical for smaller vendors who lack dedicated security teams. This is an often-overlooked option that can dramatically lower the barrier to running a credible CVD program without building the capability entirely in-house.

Who Is Most At Risk Without a CVD Program

The Researcher Relationship Problem
Mid-market SaaS providers — large enough to attract researcher attention, too small to have dedicated security engineering
Industrial and OT/ICS vendors — historically resistant to external security engagement, yet increasingly targeted
Open-source maintainers — often lack organizational infrastructure to formalize disclosure processes
Healthcare and critical infrastructure software vendors — high-value targets where unpatched vulnerabilities have life-safety implications

Beyond Policy: The Operational Reality

Publishing a VDP webpage is the starting line, not the finish line. Organizations frequently underestimate the operational burden: triaging incoming reports, communicating with researchers, coordinating internal engineering responses, requesting CVE identifiers through a CNA (CVE Numbering Authority), and managing public disclosure timelines. Each of these steps requires defined ownership, tooling, and escalation paths.

The guidance's incorporation of Stakeholder-Specific Vulnerability Categorization (SSVC) is noteworthy. SSVC moves organizations away from CVSS score-driven prioritization — which notoriously fails to capture real-world exploitability context — toward decision-tree frameworks that factor in actual deployment context and threat actor capability. This is a meaningful operational upgrade for mature security teams.

Shield53 Recommendations

For Software Vendors and Service Providers

  • Publish a VDP immediately — even a minimal policy with a contact address and basic safe harbor language is better than silence
  • Designate a CVD owner — assign clear internal accountability before the first report arrives, not after
  • Register as a CVE Numbering Authority (CNA) or establish a relationship with an existing CNA to streamline CVE assignment
  • Integrate SSVC into your triage workflow to replace or supplement CVSS-only prioritization
  • Consider CISA or a national CSIRT as an intermediary if internal capacity is limited — this is an explicitly supported model in the guidance
  • Establish researcher safe harbor language — consult legal counsel to define the scope of protected research activity clearly

For CISOs Evaluating Third-Party Vendors

  • Add CVD program maturity to your vendor security assessment questionnaires
  • Treat absence of a public VDP as a risk indicator, particularly for vendors handling sensitive data or critical functions
  • Ask vendors how they handle researcher-reported vulnerabilities before a crisis forces the question

The release of this guidance is an opportunity, not just a reference document. Organizations that act on it now will be better positioned to catch vulnerabilities before adversaries do — and to build the researcher relationships that make that possible at scale.