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24/06/2026 9:21 pm
TL;DR: CVSS gives vulnerability severity a common language, while EPSS estimates exploit likelihood from live threat data, and Entro Security argues the two are complementary for prioritising NHI risk. Severity alone can still mislead remediation when exposure, exploitability, and identity context do not line up.
NHIMG editorial — based on content published by Entro Security: CVSS vs EPSS: Vulnerability and Exploit Scoring for NHIs
By the numbers:
- 72% of organisations have experienced or suspect they have experienced a breach of non-human identities.
Questions worth separating out
Q: How should security teams prioritise vulnerabilities in NHI environments?
A: Prioritise by combining CVSS severity, EPSS exploit likelihood, and identity context.
Q: Why do CVSS scores often mislead NHI remediation decisions?
A: CVSS measures severity, not whether the vulnerable identity path is reachable or useful to an attacker.
Q: How can teams tell whether EPSS is improving vulnerability governance?
A: EPSS is helping when it changes remediation order in a way that matches real attack pressure.
Practitioner guidance
- Combine severity and exploitability in one triage queue Score vulnerabilities with CVSS and EPSS together, then add identity context such as secret exposure, privilege scope, and external reachability before assigning remediation priority.
- Overlay entitlement scope on every high-risk finding Check whether the affected NHI has standing privilege, broad OAuth grants, or reusable credentials that would turn a medium flaw into a high-impact access path.
- Separate patch urgency from identity remediation Treat patching, secret rotation, and privilege reduction as linked but distinct workstreams so a vulnerable workload does not retain unnecessary access while waiting for a fix.
What's in the full article
Entro Security's full blog covers the operational detail this post intentionally leaves for the source:
- A side-by-side explanation of how CVSS base, temporal, and environmental metrics are applied in practice.
- A clearer breakdown of how EPSS uses threat data to estimate exploitation likelihood across vulnerable assets.
- Implementation context for teams deciding when to use one score for reporting and the other for remediation ordering.
- The vendor's own view on how its NHI audience should interpret the two scoring models together.
👉 Read Entro Security's analysis of CVSS vs EPSS for NHI risk prioritisation →
CVSS vs EPSS for NHI risk scoring: are your controls keeping up?
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25/06/2026 6:32 am
CVSS overstates certainty when identity context is missing. The score is useful for standardised severity reporting, but it was not designed to tell NHI teams whether a service account, token, or workload path is actually exposed in a way attackers can use. That gap is not a defect in CVSS so much as a mismatch between a vulnerability model and an identity governance problem. Practitioners should treat CVSS as one signal, not the decision.
A few things that frame the scale:
- Only 1.5 out of 10 organisations are highly confident in their ability to secure NHIs, compared to nearly 1 in 4 for securing human identities, according to The State of Non-Human Identity Security.
- A separate finding shows that 85% of organisations lack full visibility into third-party vendors connected via OAuth apps, including 38% with no or low visibility.
A question worth separating out:
Q: What is the difference between vulnerability severity and exploit likelihood?
A: Severity describes the potential impact of a flaw, while exploit likelihood describes how probable it is that the flaw will be used in the wild. Security teams need both views because a severe but unreachable issue may wait, while a less severe flaw on an exposed identity path may need immediate action.
👉 Read our full editorial: CVSS vs EPSS for NHI risk: where severity still misleads
