Is CVE-2017-0903 in the CISA KEV catalog?

No. CVE-2017-0903 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-0903?

CVE-2017-0903 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2017-0903?

CVE-2017-0903 has an EPSS score of 15.85% (96th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2017-0903

CRITICALEPSS 96th pctl

9.8

CVSS v3

NVD

Description

RubyGems versions between 2.0.0 and 2.6.13 are vulnerable to a possible remote code execution vulnerability. YAML deserialization of gem specifications can bypass class white lists. Specially crafted serialized objects can possibly be used to escalate to remote code execution.

CWE-502Deserialization of Untrusted Data

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

15.85%probability of exploitation in 30 days

96thpercentile

Very high risk: more likely to be exploited than 96% of all known CVEs.

References

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-13.