CVE-2020-11996

medium

Published 2022-02-09 · Modified 2024-03-11

💬 Discuss on Community ✚ Propose mitigation

CVSS v3

—

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v4 NEW

—

not yet in upstream

VIR risk

5.5

Description

A specially crafted sequence of HTTP/2 requests sent to Apache Tomcat 10.0.0-M1 to 10.0.0-M5, 9.0.0.M1 to 9.0.35 and 8.5.0 to 8.5.55 could trigger high CPU usage for several seconds. If a sufficient number of such requests were made on concurrent HTTP/2 connections, the server could become unresponsive.

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	—

Arch Fixed 1 release

Version	Status	Fixed in
—	Fixed	`9.0.37-1`

Debian Fixed 5 releases

Version	Status	Fixed in
trixie	Fixed	`9.0.36-1`
sid	Fixed	`9.0.36-1`
forky	Fixed	`9.0.36-1`
bullseye	Fixed	`9.0.36-1`
bookworm	Fixed	`9.0.36-1`

Package impact

Ecosystem	Package	Vulnerable	Fixed
Maven	org.apache.tomcat:tomcat	`>=10.0.0-M1,<10.0.0-M5`	`10.0.0-M5`
Maven	org.apache.tomcat:tomcat	`>=9.0.0.M1,<9.0.35`	`9.0.35`
Maven	org.apache.tomcat:tomcat	`>=8.5.0,<8.5.55`	`8.5.55`

References

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

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