CVE-2020-11996

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Summary

CVECVE-2020-11996
StatePUBLISHED
Assignerapache
Source PriorityCVE Program / NVD first with legacy fallback
Published2020-06-26 17:15:10 UTC
Updated2026-10-08 22:16:56 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

EPSS: 0.266990000 probability, percentile 0.980140000 (date 2026-10-20)

Problem Types: NVD-CWE-noinfo | Denial of Service

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
2.0[email protected]Primary5AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial

AV:N/AC:L/Au:N/C:N/I:N/A:P

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Apache Tomcat 10.0.0 milestone1 All All
Application Apache Tomcat 10.0.0 milestone2 All All
Application Apache Tomcat 10.0.0 milestone3 All All
Application Apache Tomcat 10.0.0 milestone4 All All
Application Apache Tomcat 10.0.0 milestone5 All All
Application Apache Tomcat 9.0.0 milestone1 All All
Application Apache Tomcat 9.0.0 milestone10 All All
Application Apache Tomcat 9.0.0 milestone11 All All
Application Apache Tomcat 9.0.0 milestone12 All All
Application Apache Tomcat 9.0.0 milestone13 All All
Application Apache Tomcat 9.0.0 milestone14 All All
Application Apache Tomcat 9.0.0 milestone15 All All
Application Apache Tomcat 9.0.0 milestone16 All All
Application Apache Tomcat 9.0.0 milestone17 All All
Application Apache Tomcat 9.0.0 milestone18 All All
Application Apache Tomcat 9.0.0 milestone19 All All
Application Apache Tomcat 9.0.0 milestone2 All All
Application Apache Tomcat 9.0.0 milestone20 All All
Application Apache Tomcat 9.0.0 milestone21 All All
Application Apache Tomcat 9.0.0 milestone22 All All
Application Apache Tomcat 9.0.0 milestone23 All All
Application Apache Tomcat 9.0.0 milestone24 All All
Application Apache Tomcat 9.0.0 milestone25 All All
Application Apache Tomcat 9.0.0 milestone26 All All
Application Apache Tomcat 9.0.0 milestone27 All All
Application Apache Tomcat 9.0.0 milestone3 All All
Application Apache Tomcat 9.0.0 milestone4 All All
Application Apache Tomcat 9.0.0 milestone5 All All
Application Apache Tomcat 9.0.0 milestone6 All All
Application Apache Tomcat 9.0.0 milestone7 All All
Application Apache Tomcat 9.0.0 milestone8 All All
Application Apache Tomcat 9.0.0 milestone9 All All
Application Apache Tomcat All All All All
Application Apache Tomcat All All All All
Operating System Canonical Ubuntu Linux 20.04 All All All
Operating System Debian Debian Linux 10.0 All All All
Operating System Debian Debian Linux 9.0 All All All
Application Netapp Oncommand System Manager 3.0 All All All
Application Netapp Oncommand System Manager 3.1.3 All All All
Operating System Opensuse Leap 15.1 All All All
Operating System Opensuse Leap 15.2 All All All
Application Oracle Mysql Enterprise Monitor All All All All
Application Oracle Siebel Ui Framework All All All All
Application Oracle Workload Manager 12.2.0.1 All All All
Application Oracle Workload Manager 18c All All All
Application Oracle Workload Manager 19c All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Apache Apache Tomcat affected 10.0.0-M1 to 10.0.0-M5 Not specified
CNA Apache Apache Tomcat affected 9.0.0.M1 to 9.0.35 Not specified
CNA Apache Apache Tomcat affected 8.5.0 to 8.5.55 Not specified

References

ReferenceSourceLinkTags
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
CVE-2020-11996 Apache Tomcat Vulnerability in NetApp Products | NetApp Product Security af854a3a-2127-422b-91ae-364da2661108 security.netapp.com Third Party Advisory
[security-announce] openSUSE-SU-2020:1051-1: important: Security update af854a3a-2127-422b-91ae-364da2661108 lists.opensuse.org Mailing List, Third Party Advisory
USN-4596-1: Tomcat vulnerabilities | Ubuntu security notices | Ubuntu af854a3a-2127-422b-91ae-364da2661108 usn.ubuntu.com Third Party Advisory
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Oracle Critical Patch Update Advisory - January 2021 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com Third Party Advisory
[SECURITY] [DLA 2279-1] tomcat8 security update af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Debian -- Security Information -- DSA-4727-1 tomcat9 af854a3a-2127-422b-91ae-364da2661108 www.debian.org Third Party Advisory
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Oracle Critical Patch Update Advisory - October 2020 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com Third Party Advisory
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
[security-announce] openSUSE-SU-2020:1063-1: important: Security update af854a3a-2127-422b-91ae-364da2661108 lists.opensuse.org Mailing List, Third Party Advisory
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org Mailing List, Vendor Advisory
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Pony Mail! MITRE lists.apache.org
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CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 296072 Oracle Solaris 11.4 Support Repository Update (SRU) 25.75.3 Missing (CPUJUL2020)
  • 690453 Free Berkeley Software Distribution (FreeBSD) Security Update for apache tomcat (6a72eff7-ccd6-11ea-9172-4c72b94353b5)
  • 750636 OpenSUSE Security Update for tomcat (openSUSE-SU-2020:1063-1)

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