The CVSS 10 rating on CVE-2024-27253 is technically accurate but obscures a more important truth: this is an authenticated-user authorization bypass in IBM DOORS Next, and the gap between that 10.0 score and the EPSS of 0.00316 tells you far more about the exploitation reality than the severity score alone.
Here's what matters: DOORS Next isn't general-purpose collaboration software. It serves as the regulatory spine for aerospace, medical device, and defense programs — the system where compliance auditors trace requirements to shipped products, where FDA submissions are validated against baseline traceability chains, where architectural decisions get immortalized as authoritative records. An authorization bypass in this context isn't a permission escalation story. It's an integrity-of-the-compliance-chain story. The EPSS tells you attackers haven't automated exploitation for this, but it says nothing about the threat model that actually matters: insiders, compliance auditors, contract reviewers, or anyone with authenticated access who understands what they're looking at. The population capable of exploiting this is small, but the impact on downstream certifications, audit trails, and regulatory submissions is potentially catastrophic.
The versioning pattern is a forensic breadcrumb. The vulnerability existed across '7.0.3 through Interim Fix 018' — eighteen iterative hotfixes where authorization logic was patched around workflow problems without revisiting the underlying permission state machine. That's how authorization models rot: each interim fix addresses a symptom, and security constraints get carved out piece by piece until what remains only looks comprehensive. The bypass didn't appear in IF018; it persisted through the entire series.
What to do: prioritize this patch not for its exploitation probability but for its compliance implications. If you're running DOORS Next in a regulated environment, treat this as a data-integrity issue, not just a security issue. Your traceability chains, baseline integrity, and certification artifacts may depend on the assumption that the authorization model is sound. That's the blast radius the CVSS vector doesn't capture.
The low EPSS likely reflects the specialized target population rather than low risk. Generalist exploit tooling doesn't apply here. The attackers who matter are already authenticated — and they understand exactly what compliance data is worth.