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CVE-2019-0199

The HTTP/2 implementation in Apache Tomcat 9.0.0.M1 to 9.0.14 and 8.5.0 to 8.5.37 accepted streams with excessive numbers of SETTINGS…

High7.5EPSS 72.9%
Published
Updated
Reserved
Assigned by
apache

Description

The HTTP/2 implementation in Apache Tomcat 9.0.0.M1 to 9.0.14 and 8.5.0 to 8.5.37 accepted streams with excessive numbers of SETTINGS frames and also permitted clients to keep streams open without reading/writing request/response data. By keeping streams open for requests that utilised the Servlet API's blocking I/O, clients were able to cause server-side threads to block eventually leading to thread exhaustion and a DoS.

Scores

CVSS scores of CVE-2019-0199, by who scored it
Scored byCVSSScoreVector
NVDNVD · Modified3.0High7.5CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
72.9% · top 0.5% of all CVEs (5 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Weakness

Affected products

  • Apache Tomcat

    • affected Apache Tomcat 9.0.0.M1 to 9.0.14, 8.5.0 to 8.5.37

Affected packages

From reviewed advisories of the GitHub Advisory Database.

References (35)

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

CVE-2019-0199 badge
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Record last updated .