CVE-2019-0199

high

Published 2020-06-15 · Modified 2026-05-20

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CVSS v3

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

CVSS v4 NEW

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not yet in upstream

VIR risk

8.0

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.

Predictions

Exploit likelihood

30%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact

SUSE Affected 1 release

Version	Status	Fixed in
—	Affected	—

Debian Fixed 5 releases

Version	Status	Fixed in
trixie	Fixed	`9.0.16-1`
sid	Fixed	`9.0.16-1`
forky	Fixed	`9.0.16-1`
bullseye	Fixed	`9.0.16-1`
bookworm	Fixed	`9.0.16-1`

Package impact

Ecosystem	Package	Vulnerable	Fixed
Maven	org.apache.tomcat.embed:tomcat-embed-core	`>=9.0.0,<9.0.16`	`9.0.16`
Maven	org.apache.tomcat.embed:tomcat-embed-core	`>=8.0.0,<8.5.38`	`8.5.38`
Maven	org.apache.tomcat:tomcat-coyote	`>=9.0.0,<9.0.16`	`9.0.16`
Maven	org.apache.tomcat:tomcat-coyote	`>=8.0.0,<8.5.38`	`8.5.38`
MAVEN	org.apache.tomcat:tomcat-coyote	`>= 8.0.0, < 8.5.38`	`8.5.38`
MAVEN	org.apache.tomcat:tomcat-coyote	`>= 9.0.0, < 9.0.16`	`9.0.16`
MAVEN	org.apache.tomcat.embed:tomcat-embed-core	`>= 8.0.0, < 8.5.38`	`8.5.38`
MAVEN	org.apache.tomcat.embed:tomcat-embed-core	`>= 9.0.0, < 9.0.16`	`9.0.16`

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.