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NVD / CVE Program· CNA redhat

CVE-2016-4993: CRLF injection vulnerability in the Undertow web server in WildFly 10.0.0, as used in Red Hat JBoss Enterprise Application Platform (EAP)…

MediumCVSS 6.1 · v3.0—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 25/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 2.5% (FIRST EPSS); higher than 85.2% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: undertow (Debian:14) 1.4.3-1; org.wildfly:wildfly-undertow (Maven) 11.0.0.Final; eap7-activemq-artemis (Red Hat:jboss_enterprise_application_platform:7::el6) 0:1.1.0-15.SP18_redhat_1.1.ep7.el6, 0:1.5.5.008-1.redhat_1.1.ep7.el6.

Low priority for now. Upgrade to undertow (Debian:14) 1.4.3-1; org.wildfly:wildfly-undertow (Maven) 11.0.0.Final; eap7-activemq-artemis (Red Hat:jboss_enterprise_application_platform:7::el6) 0:1.1.0-15.SP18_redhat_1.1.ep7.el6, 0:1.5.5.008-1.redhat_1.1.ep7.el6 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

Published
Sep 26, 2016
Updated
Jun 16, 2026
EPSS
2.5% · 85th percentile

Report tools

JSON

Action score

25

Monitor

Low priority for now.

CVSS
24 / 40 · 6.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 2.5%

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
redhatjboss enterprise application platform
redhatjboss wildfly application server
redhatenterprise linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • redhat jboss enterprise application platformup to 7.0.1 inclusive
  • redhat jboss wildfly application server10.0.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:14undertowbefore 1.4.3-11.4.3-1
Mavenorg.wildfly:wildfly-undertowfrom 10.0.0.Final · before 11.0.0.Final11.0.0.Final
Red Hat:jboss_enterprise_application_platform:7::el6eap7-activemq-artemisbefore 0:1.1.0-15.SP18_redhat_1.1.ep7.el60:1.1.0-15.SP18_redhat_1.1.ep7.el6
Red Hat:jboss_enterprise_application_platform:7::el6eap7-activemq-artemisbefore 0:1.5.5.008-1.redhat_1.1.ep7.el60:1.5.5.008-1.redhat_1.1.ep7.el6
Red Hat:jboss_enterprise_application_platform:7::el6eap7-activemq-artemis-clibefore 0:1.5.5.008-1.redhat_1.1.ep7.el60:1.5.5.008-1.redhat_1.1.ep7.el6
Red Hat:jboss_enterprise_application_platform:7::el6eap7-activemq-artemis-clibefore 0:1.1.0-15.SP18_redhat_1.1.ep7.el60:1.1.0-15.SP18_redhat_1.1.ep7.el6
Red Hat:jboss_enterprise_application_platform:7::el6eap7-activemq-artemis-commonsbefore 0:1.5.5.008-1.redhat_1.1.ep7.el60:1.5.5.008-1.redhat_1.1.ep7.el6
Red Hat:jboss_enterprise_application_platform:7::el6eap7-activemq-artemis-commonsbefore 0:1.1.0-15.SP18_redhat_1.1.ep7.el60:1.1.0-15.SP18_redhat_1.1.ep7.el6
Red Hat:jboss_enterprise_application_platform:7::el6eap7-activemq-artemis-core-clientbefore 0:1.1.0-15.SP18_redhat_1.1.ep7.el60:1.1.0-15.SP18_redhat_1.1.ep7.el6
Red Hat:jboss_enterprise_application_platform:7::el6eap7-activemq-artemis-core-clientbefore 0:1.5.5.008-1.redhat_1.1.ep7.el60:1.5.5.008-1.redhat_1.1.ep7.el6
Red Hat:jboss_enterprise_application_platform:7::el6eap7-activemq-artemis-dtobefore 0:1.5.5.008-1.redhat_1.1.ep7.el60:1.5.5.008-1.redhat_1.1.ep7.el6
Red Hat:jboss_enterprise_application_platform:7::el6eap7-activemq-artemis-dtobefore 0:1.1.0-15.SP18_redhat_1.1.ep7.el60:1.1.0-15.SP18_redhat_1.1.ep7.el6
Red Hat:jboss_enterprise_application_platform:7::el6eap7-activemq-artemis-hornetq-protocolbefore 0:1.5.5.008-1.redhat_1.1.ep7.el60:1.5.5.008-1.redhat_1.1.ep7.el6
Red Hat:jboss_enterprise_application_platform:7::el6eap7-activemq-artemis-hornetq-protocolbefore 0:1.1.0-15.SP18_redhat_1.1.ep7.el60:1.1.0-15.SP18_redhat_1.1.ep7.el6
Red Hat:jboss_enterprise_application_platform:7::el6eap7-activemq-artemis-hqclient-protocolbefore 0:1.5.5.008-1.redhat_1.1.ep7.el60:1.5.5.008-1.redhat_1.1.ep7.el6
Red Hat:jboss_enterprise_application_platform:7::el6eap7-activemq-artemis-hqclient-protocolbefore 0:1.1.0-15.SP18_redhat_1.1.ep7.el60:1.1.0-15.SP18_redhat_1.1.ep7.el6
Red Hat:jboss_enterprise_application_platform:7::el6eap7-activemq-artemis-jdbc-storebefore 0:1.5.5.008-1.redhat_1.1.ep7.el60:1.5.5.008-1.redhat_1.1.ep7.el6
Red Hat:jboss_enterprise_application_platform:7::el6eap7-activemq-artemis-jms-clientbefore 0:1.1.0-15.SP18_redhat_1.1.ep7.el60:1.1.0-15.SP18_redhat_1.1.ep7.el6
Red Hat:jboss_enterprise_application_platform:7::el6eap7-activemq-artemis-jms-clientbefore 0:1.5.5.008-1.redhat_1.1.ep7.el60:1.5.5.008-1.redhat_1.1.ep7.el6
Red Hat:jboss_enterprise_application_platform:7::el6eap7-activemq-artemis-jms-serverbefore 0:1.1.0-15.SP18_redhat_1.1.ep7.el60:1.1.0-15.SP18_redhat_1.1.ep7.el6
Red Hat:jboss_enterprise_application_platform:7::el6eap7-activemq-artemis-jms-serverbefore 0:1.5.5.008-1.redhat_1.1.ep7.el60:1.5.5.008-1.redhat_1.1.ep7.el6
Red Hat:jboss_enterprise_application_platform:7::el6eap7-activemq-artemis-journalbefore 0:1.1.0-15.SP18_redhat_1.1.ep7.el60:1.1.0-15.SP18_redhat_1.1.ep7.el6
Red Hat:jboss_enterprise_application_platform:7::el6eap7-activemq-artemis-journalbefore 0:1.5.5.008-1.redhat_1.1.ep7.el60:1.5.5.008-1.redhat_1.1.ep7.el6
Red Hat:jboss_enterprise_application_platform:7::el6eap7-activemq-artemis-nativebefore 0:1.1.0-15.SP18_redhat_1.1.ep7.el60:1.1.0-15.SP18_redhat_1.1.ep7.el6

+96

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Published before and after this one in the same product

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    58Plan
  • ← EarlierCVE-2016-3110Sep 26, 2016 · mod_cluster, as used in Red Hat JBoss Web Server 2.1, allows remote attackers to cause a denial of service (Apache http server crash) via…
    31Monitor
  • Later →CVE-2016-5406Sep 26, 2016 · The domain controller in Red Hat JBoss Enterprise Application Platform (EAP) 7.x before 7.0.2 allows remote authenticated users to gain…
    36Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:undertow1.4.3-1 · Debian:14Package registry (OSV)
Maven:org.wildfly:wildfly-undertow11.0.0.FinalPackage registry (OSV)
red hat:eap7-activemq-artemis0:1.1.0-15.SP18_redhat_1.1.ep7.el6 · Red Hat:jboss_enterprise_application_platform:7::el6Package registry (OSV)
red hat:eap7-activemq-artemis-cli0:1.1.0-15.SP18_redhat_1.1.ep7.el6 · Red Hat:jboss_enterprise_application_platform:7::el6Package registry (OSV)
red hat:eap7-activemq-artemis-commons0:1.1.0-15.SP18_redhat_1.1.ep7.el6 · Red Hat:jboss_enterprise_application_platform:7::el6Package registry (OSV)
red hat:eap7-activemq-artemis-core-client0:1.1.0-15.SP18_redhat_1.1.ep7.el6 · Red Hat:jboss_enterprise_application_platform:7::el6Package registry (OSV)
red hat:eap7-activemq-artemis-dto0:1.1.0-15.SP18_redhat_1.1.ep7.el6 · Red Hat:jboss_enterprise_application_platform:7::el6Package registry (OSV)
red hat:eap7-activemq-artemis-hornetq-protocol0:1.1.0-15.SP18_redhat_1.1.ep7.el6 · Red Hat:jboss_enterprise_application_platform:7::el6Package registry (OSV)
red hat:eap7-activemq-artemis-hqclient-protocol0:1.1.0-15.SP18_redhat_1.1.ep7.el6 · Red Hat:jboss_enterprise_application_platform:7::el6Package registry (OSV)
red hat:eap7-activemq-artemis-jms-client0:1.1.0-15.SP18_redhat_1.1.ep7.el6 · Red Hat:jboss_enterprise_application_platform:7::el6Package registry (OSV)
red hat:eap7-activemq-artemis-jms-server0:1.1.0-15.SP18_redhat_1.1.ep7.el6 · Red Hat:jboss_enterprise_application_platform:7::el6Package registry (OSV)
red hat:eap7-activemq-artemis-journal0:1.1.0-15.SP18_redhat_1.1.ep7.el6 · Red Hat:jboss_enterprise_application_platform:7::el6Package registry (OSV)
red hat:eap7-activemq-artemis-native0:1.1.0-15.SP18_redhat_1.1.ep7.el6 · Red Hat:jboss_enterprise_application_platform:7::el6Package registry (OSV)
red hat:eap7-activemq-artemis-ra0:1.1.0-15.SP18_redhat_1.1.ep7.el6 · Red Hat:jboss_enterprise_application_platform:7::el6Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
low · data or configuration can be modified
Availability
none

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality impact
Low
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-93 · Improper Neutralization of CRLF Sequences ('CRLF Injection')

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

References

Show all references (10 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records