CRLF Injection The advisory has been revoked - it doesn't affect any version of package undertow (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UBUNTU1604-UNDERTOW-1222825
- published21 Mar 2026
- disclosed26 Sept 2016
Introduced: 26 Sep 2016
CVE-2016-4993 (opens in a new tab)Amendment
The Ubuntu security team deemed this advisory irrelevant for Ubuntu:16.04.
NVD Description
Note: Versions mentioned in the description apply only to the upstream undertow package and not the undertow package as distributed by Ubuntu.
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.
References
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2016-4993
- http://www.securityfocus.com/bid/92894
- https://bugzilla.redhat.com/show_bug.cgi?id=1344321
- http://rhn.redhat.com/errata/RHSA-2016-1838.html
- http://rhn.redhat.com/errata/RHSA-2016-1839.html
- http://rhn.redhat.com/errata/RHSA-2016-1840.html
- http://rhn.redhat.com/errata/RHSA-2016-1841.html
- https://access.redhat.com/errata/RHSA-2017:3454
- https://access.redhat.com/errata/RHSA-2017:3455
- https://access.redhat.com/errata/RHSA-2017:3456
- https://access.redhat.com/errata/RHSA-2017:3458
- http://www.securitytracker.com/id/1036758