Is CVE-2018-6337 in the CISA KEV catalog?

No. CVE-2018-6337 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-6337?

CVE-2018-6337 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2018-6337?

CVE-2018-6337 has an EPSS score of 1.78% (75th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-6337?

Upgrade hhvm to 3.26.3 or later.

CVE & CISA-KEV Catalog

CVE-2018-6337

HIGHEPSS 75th pctl

7.5

CVSS v3

NVD

Description

folly::secureRandom will re-use a buffer between parent and child processes when fork() is called. That will result in multiple forked children producing repeat (or similar) results. This affects HHVM 3.26 prior to 3.26.3 and the folly library between v2017.12.11.00 and v2018.08.09.00.

CWE-212 CWE-119Buffer Overflow

How to fix

Remediation Available

hhvmNVD

Affected:>= 3.26, < 3.26.3Fixed in:3.26.3CVE-2018-6337derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Exploit Intelligence

1.78%probability of exploitation in 30 days

75thpercentile

Elevated risk: more likely to be exploited than 75% of all known CVEs.

References

Patch2

Vendor Advisory1

hhvm.com

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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 2025-05-06.