CVE-2020-11996

medium

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

CVSS v3

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

CVSS v2

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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

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2020-11996

vendor Authored 2026-05-27

Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2020-11996.html

OS impact

OS	Version	Status	Fixed in
arch		fixed	`9.0.37-1`
sles		affected
debian	bookworm	fixed	`9.0.36-1`
debian	bullseye	fixed	`9.0.36-1`
debian	forky	fixed	`9.0.36-1`
debian	sid	fixed	`9.0.36-1`
debian	trixie	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

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