No exploitation reportedFix available

CVE-2016-9589

Q: Is CVE-2016-9589 actively exploited?

Active exploitation of CVE-2016-9589 has not been confirmed. Its EPSS score was 3.0% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2016-9589?

CVE-2016-9589 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

No exploitation reported by the sources we read.

Published2018-03-12
WeaknessCWE-400

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Undertow in Red Hat wildfly before version 11.0.0.Beta1 is vulnerable to a resource exhaustion resulting in a denial of service. Undertow keeps a cache of seen HTTP headers in persistent connections. It was found that this cache can easily exploited to fill memory with garbage, up to "max-headers" (default 200) * "max-header-size" (default 1MB) per active TCP connection.

Timeline

dates in UTC

2018-03-1215:29CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2016-9589?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2016-9589?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV

Redhat jboss wildfly application server

Branch	Affected	Fixed in	Source
10.1	≤ 10.1.0	no fix published	NVD
11.0	= 11.0.0	no fix published	NVD

wildfly-undertow

Branch	Affected	Fixed in	Source
11.0	< 11.0.0.Beta1	11.0.0.Beta1	OSV

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

rhn.redhat.comVendor Advisory
rhn.redhat.comVendor Advisory
rhn.redhat.comVendor Advisory
rhn.redhat.comVendor Advisory
rhn.redhat.comVendor Advisory
access.redhat.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.07.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
CNAweakness (CWE)CWE-400read 2026-10-23
NVDweakness (CWE)CWE-400read 2026-10-23
FIRST EPSSEPSS score3.0 %2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2018-03-12
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2016-9589?

Is CVE-2016-9589 actively exploited?

Active exploitation of CVE-2016-9589 has not been confirmed. Its EPSS score was 3.0% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2016-9589?

CVE-2016-9589 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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