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CVE-2016-6817

23
FAUCET Score

CVE-2016-6817 describes a denial-of-service vulnerability affecting Apache Tomcat versions 9.0.0.M1 through 9.0.0.M11 and 8.5.0 through 8.5.6. An attacker could trigger an infinite loop in the HTTP/2 header parser by sending a header larger than the available buffer. This vulnerability carries a CVSS v3 score of 7.5 (HIGH), indicating it can be exploited remotely with low complexity, leading to a complete loss of availability. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
8.5.0CPE matchmatch criteria
cpe:2.3:a:apache:tomcat:8.5.0:*:*:*:*:*:*:*
8.5.1CPE matchmatch criteria
cpe:2.3:a:apache:tomcat:8.5.1:*:*:*:*:*:*:*
8.5.2CPE matchmatch criteria
cpe:2.3:a:apache:tomcat:8.5.2:*:*:*:*:*:*:*
8.5.3CPE matchmatch criteria
cpe:2.3:a:apache:tomcat:8.5.3:*:*:*:*:*:*:*
8.5.4CPE matchmatch criteria
cpe:2.3:a:apache:tomcat:8.5.4:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
7.19%
Probability of exploitation in next 30 days
EPSS Percentile
93.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0719 is in the 89th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

mavenpatch availablevia ghsa
Product: org.apache.tomcat:tomcatFixed in: 9.0.0.M12
mavenpatch availablevia ghsa
Product: org.apache.tomcat:tomcatFixed in: 8.5.8
redhatvendor investigatingvia redhat_api
Product: Red Hat Software CollectionsFixed in: rh-java-common-tomcat

Vendor Advisories (2)

mavenGHSA-698c-2x4j-g9gqhigh

Improper Restriction of Operations within the Bounds of a Memory Buffer in Apache Tomcat

May 14, 2022
redhatCVE-2016-6817Important

tomcat: Infinite loop in HTTP/2 header parser

Nov 22, 2016

References

lists.apache.org / thread.html/343558d982879bf88ec20dbf707f8c11255f8e219e81d45c4f8d0551%40%3Cdev.tomcat.apache.org%3E
lists.apache.org / thread.html/6af47120905aa7d8fe12f42e8ff2284fb338ba141d3b77b8c7cb61b3%40%3Cdev.tomcat.apache.org%3E
lists.apache.org / thread.html/88855876c33f2f9c532ffb75bfee570ccf0b17ffa77493745af9a17a%40%3Cdev.tomcat.apache.org%3E
lists.apache.org / thread.html/a9f24571460af003071475b75f18cad81ebcc36fa7c876965a75e32a%40%3Cannounce.tomcat.apache.org%3E
lists.apache.org / thread.html/b5e3f51d28cd5d9b1809f56594f2cf63dcd6a90429e16ea9f83bbedc%40%3Cdev.tomcat.apache.org%3E
security.netapp.com / advisory/ntap-20180607-0001
securityfocus.com / bid/94462
Third Party AdvisoryVDB Entry
securitytracker.com / id/1037330
Third Party AdvisoryVDB Entry