Is CVE-2016-4993 in the CISA KEV catalog?

No. CVE-2016-4993 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-4993?

CVE-2016-4993 has a CVSS v3 base score of 6.1 (MEDIUM).

What is the EPSS score for CVE-2016-4993?

CVE-2016-4993 has an EPSS score of 2.56% (83th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-4993?

Upgrade undertow on debian unstable to 1.4.3-1 or later.

CVE & CISA-KEV Catalog

CVE-2016-4993

MEDIUMEPSS 83th pctl

6.1

CVSS v3

NVD

Description

CRLF injection vulnerability in the Undertow web server in WildFly 10.0.0, as used in Red Hat JBoss Enterprise Application Platform (EAP) 7.x before 7.0.2, allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via unspecified vectors.

CWE-93 CWE-113

How to fix

Remediation Available

undertowDebian

Fixed in:1.4.3-1CVE-2016-4993

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 InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

2.56%probability of exploitation in 30 days

83rdpercentile

Elevated risk: more likely to be exploited than 83% of all known CVEs.

References

Third-Party Advisory6

Other references5

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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 2026-05-06.