CVE-2020-11996

mediumpriority · attend · 49EPSS 0.267 · 98 %ileexploit · PoCDEEUNLRUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · PoC

Likely / severe?

26.7% (98th) EPSS

CVSS 5 · medium

Is it mine?

106 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · osv

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–7.5

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.17.5highAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · FSTEC (BDU) RU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · OSV

v3.17.1highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Psecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-399USCWE-400USCWE-400USCWE-400US

exploits (1)

Public proof-of-concept and weaponised exploit code.

rusakovichma/tomcat-embed-core-9.0.31-CVE-2020-11996tomcat-embed-core-9.0.31 CVE-2020-11996 Test PoCPoC · poc_in_github

affected products (106)

Products and version ranges known to be affected.

Debian Linuxall versionscert_bundDEcpe:/o:debian:debian_linux:-
Dell Data Protection Advisor <19.12all versionscert_bundDE
Gentoo Linuxall versionscert_bundDEcpe:/o:gentoo:linux:-
Oracle Linuxall versionscert_bundDEcpe:/o:oracle:linux:-
Oracle MySQLall versionscert_bundDEcpe:/a:oracle:mysql:-
Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
Dell Data Protection Advisor< 19.12cert_bundDE
Apache Apache Tomcat≤ 10.0.0-M1 to 10.0.0-M5enisa_euvdEU
Apache Apache Tomcat≤ 9.0.0.M1 to 9.0.35enisa_euvdEU
Apache Apache Tomcat≤ 8.5.0 to 8.5.55enisa_euvdEU
Apache Software Foundation Tomcat10.0.0 milestone1 → 10.0.0 milestone5fstec_bduRU
Apache Software Foundation Tomcat8.5.0 → 8.5.55fstec_bduRU
Apache Software Foundation Tomcat9.0.0 → 9.0.35fstec_bduRU
Apache Software Foundation Tomcat9.0.0 milestone1 → 9.0.0 milestone27fstec_bduRU
Canonical Ltd. Ubuntu≤ 20.04 LTSfstec_bduRU
Novell Inc. OpenSUSE Leap≤ 15.1fstec_bduRU
Novell Inc. OpenSUSE Leap≤ 15.2fstec_bduRU
Oracle Corp. Database Server≤ 18cfstec_bduRU
Oracle Corp. Database Server≤ 19cfstec_bduRU
Oracle Corp. Database Server≤ 12.2.0.1fstec_bduRU

showing 20 of 106

advisories (6)

Vendor and ecosystem advisories describing this.

NCSC-2025-0123Kwetsbaarheden verholpen in Oracle Database ProductenNL2025-04-16csaf · ncsc_nlNL
Oracle heeft kwetsbaarheden verholpen in diverse Oracle Database Producten en subsystemen, zoals Oracle Server, NoSQL, TimesTen, Secure Backup en Essbase.
WID-SEC-W-2022-1375JFrog Artifactory: Mehrere SchwachstellenDeutsch2022-09-11csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in JFrog Artifactory ausnutzen, um seine Privilegien zu erweitern, beliebigen Code auszuführen, Sicherheitsmaßnahmen zu umgehen, vertrauliche Informationen offenzulegen und einen Denial-of-Service-Zustand auszulösen.
WID-SEC-W-2024-0528Dell Data Protection Advisor: Mehrere SchwachstellenDeutsch2024-02-29csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Dell Data Protection Advisor ausnutzen, um beliebigen Code auszuführen, einen Denial-of-Service-Zustand herbeizuführen, Dateien zu manipulieren, vertrauliche Informationen offenzulegen, seine Berechtigungen zu erweitern oder einen nicht spezifizierten Angriff durchzuführen.
WID-SEC-W-2026-0205Oracle MySQL: Mehrere SchwachstellenDeutsch2020-10-20csaf · cert_bundDE
Ein entfernter, anonymer oder authentisierter Angreifer kann mehrere Schwachstellen in Oracle MySQL ausnutzen, um die Verfügbarkeit, Vertraulichkeit und Integrität zu gefährden.
GHSA-53hp-jpwq-2jgqUncontrolled Resource Consumption in Apache Tomcat2022-02-09ghsa · osvUS
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.
BIT-tomcat-2020-119962024-03-06vendor · osvUS
A specially crafted sequence of HTTP/2 requests sent to Apache Tomcat 10.0.0 to 10.0.0, 9.0.0 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.

also known as (6)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu osv cert_bund ncsc_nl NVD CVE.org MITRE

published 2020-06-26modified 2026-06-17

references (91)

External citations — patches, advisories, analysis.

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