CVE catalog

CVE-2020-13934

Severity: High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: Jul 14, 2020, 3:15:00 PM UTC
Updated: Aug 25, 2026, 4:28:27 PM UTC
Source: [NVD] · [CVE record]
EPSS: 64.12% · Oct 25, 2026

An h2c direct connection to Apache Tomcat 10.0.0-M1 to 10.0.0-M6, 9.0.0.M5 to 9.0.36 and 8.5.1 to 8.5.56 did not release the HTTP/1.1 processor after the upgrade to HTTP/2. If a sufficient number of such requests were made, an OutOfMemoryException could occur leading to a denial of service.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	tomcat9	sid	`9.0.122-1`	fixed
Debian	tomcat9	forky	`9.0.122-1`	fixed
Debian	tomcat9	trixie	`9.0.95-1`	fixed
Debian	tomcat9	bookworm	`9.0.70-2`	fixed
Cpe	tomcat	Not reported	Not reported	unknown
Cpe	tomcat	Not reported	Not reported	unknown
Cpe	tomcat	Not reported	Not reported	unknown
Cpe	tomcat	Not reported	Not reported	unknown
Cpe	tomcat	Not reported	Not reported	unknown
Cpe	tomcat	Not reported	Not reported	unknown
Cpe	tomcat	Not reported	Not reported	unknown
Cpe	tomcat	Not reported	Not reported	unknown
Cpe	tomcat	Not reported	Not reported	unknown
Cpe	tomcat	Not reported	Not reported	unknown
Cpe	tomcat	Not reported	Not reported	unknown
Cpe	tomcat	Not reported	Not reported	unknown
Cpe	tomcat	Not reported	Not reported	unknown
Cpe	tomcat	Not reported	Not reported	unknown
Cpe	tomcat	Not reported	Not reported	unknown
Cpe	tomcat	Not reported	Not reported	unknown
Cpe	tomcat	Not reported	Not reported	unknown
Cpe	tomcat	Not reported	Not reported	unknown
Cpe	tomcat	Not reported	Not reported	unknown
Ubuntu	tomcat8	pro	`8.5.21-1ubuntu1`	vulnerable
Ubuntu	tomcat8	pro	`8.5.29-1`	vulnerable
Ubuntu	tomcat8	pro	`8.5.30-1`	vulnerable
Ubuntu	tomcat8	pro	`8.5.30-1ubuntu1`	vulnerable
Ubuntu	tomcat8	pro	`8.5.30-1ubuntu1.2`	vulnerable
Ubuntu	tomcat8	pro	`8.5.30-1ubuntu1.3`	vulnerable
Ubuntu	tomcat8	pro	`8.5.30-1ubuntu1.4`	vulnerable
Ubuntu	tomcat8	pro	`8.5.39-1ubuntu1~18.04.1`	vulnerable
Ubuntu	tomcat8	pro	`8.5.39-1ubuntu1~18.04.2`	vulnerable
Ubuntu	tomcat8	pro	`8.5.39-1ubuntu1~18.04.3`	vulnerable
Ubuntu	tomcat8	pro	`8.5.39-1ubuntu1~18.04.3+esm1`	vulnerable
Ubuntu	tomcat8	pro	`8.5.39-1ubuntu1~18.04.3+esm2`	vulnerable
Ubuntu	tomcat8	pro	`8.5.39-1ubuntu1~18.04.3+esm3`	vulnerable
Ubuntu	tomcat8	pro	`8.5.39-1ubuntu1~18.04.3+esm4`	vulnerable
Ubuntu	tomcat8	pro	`8.5.39-1ubuntu1~18.04.3+esm5`	vulnerable
Ubuntu	tomcat8	pro	`8.5.39-1ubuntu1~18.04.3+esm6`	vulnerable
Ubuntu	tomcat9	pro	`9.0.16-3~18.04.1`	vulnerable
Ubuntu	tomcat9	pro	`9.0.16-3ubuntu0.18.04.1`	vulnerable
Ubuntu	tomcat9	pro	`9.0.16-3ubuntu0.18.04.2`	vulnerable
Ubuntu	tomcat9	pro	`9.0.16-3ubuntu0.18.04.2+esm1`	vulnerable
Ubuntu	tomcat9	pro	`9.0.16-3ubuntu0.18.04.2+esm2`	vulnerable
Ubuntu	tomcat9	pro	`9.0.16-3ubuntu0.18.04.2+esm3`	vulnerable
Ubuntu	tomcat9	pro	`9.0.16-3ubuntu0.18.04.2+esm4`	vulnerable
Ubuntu	tomcat9	pro	`9.0.16-3ubuntu0.18.04.2+esm5`	vulnerable
Ubuntu	tomcat9	pro	`9.0.16-3ubuntu0.18.04.2+esm6`	vulnerable
Ubuntu	tomcat9	pro	`9.0.16-3ubuntu0.18.04.2+esm7`	vulnerable
Ubuntu	tomcat9	pro	`9.0.16-3ubuntu0.18.04.2+esm8`	vulnerable
Ubuntu	tomcat9	20.04	`9.0.24-1`	vulnerable
Ubuntu	tomcat9	20.04	`9.0.27-1`	vulnerable
Ubuntu	tomcat9	20.04	`9.0.31-1`	vulnerable
Ubuntu	tomcat9	20.04	`9.0.31-1ubuntu0.1`	fixed
Suse	tomcat	linux enterprise server 12 sp5-ltss	`9.0.115-3.160.1`	fixed
Suse	tomcat	linux enterprise server ltss extended security 12 sp5	`9.0.115-3.160.1`	fixed
Suse	tomcat	openstack cloud 9	`9.0.36-3.45.1`	fixed
Suse	tomcat	openstack cloud crowbar 9	`9.0.36-3.45.1`	fixed
Suse	tomcat	linux enterprise server for sap applications 12 sp4	`9.0.36-3.45.1`	fixed
Suse	tomcat	linux enterprise server 12 sp4-ltss	`9.0.36-3.45.1`	fixed
Suse	tomcat	linux enterprise server 12 sp5	`9.0.36-3.45.1`	fixed
Suse	tomcat	linux enterprise server for sap applications 12 sp5	`9.0.36-3.45.1`	fixed
Suse	tomcat	linux enterprise high performance computing 15-espos	`9.0.36-3.65.2`	fixed
Suse	tomcat	linux enterprise high performance computing 15-ltss	`9.0.36-3.65.2`	fixed
Suse	tomcat	linux enterprise server 15-ltss	`9.0.36-3.65.2`	fixed
Suse	tomcat	linux enterprise server for sap applications 15	`9.0.36-3.65.2`	fixed
Opensuse	tomcat	leap 15.2	`9.0.36-lp152.2.4.1`	fixed
Opensuse	tomcat	leap 15.1	`9.0.36-lp151.3.27.1`	fixed
Suse	tomcat	linux enterprise module for web and scripting 15 sp1	`9.0.36-4.41.2`	fixed
Suse	tomcat	linux enterprise module for web and scripting 15 sp2	`9.0.36-3.6.1`	fixed
Opensuse	tomcat	tumbleweed	`9.0.43-8.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	tomcat9	source	sid	`9.0.37-1`	not yet assigned	Not reported	Not reported
Debian	tomcat9	source	forky	`9.0.37-1`	not yet assigned	Not reported	Not reported
Debian	tomcat9	source	trixie	`9.0.37-1`	not yet assigned	Not reported	Not reported
Debian	tomcat9	source	bookworm	`9.0.37-1`	not yet assigned	Not reported	Not reported
Ubuntu	tomcat9	deb	20.04	`9.0.31-1ubuntu0.1`	Not reported	UBUNTU-CVE-2020-13934	Not reported
Suse	tomcat	rpm	linux enterprise server 12 sp5-ltss	`9.0.115-3.160.1`	Not reported	SUSE-SU-2026:1058-1	Not reported
Suse	tomcat	rpm	linux enterprise server ltss extended security 12 sp5	`9.0.115-3.160.1`	Not reported	SUSE-SU-2026:1058-1	Not reported
Suse	tomcat	rpm	openstack cloud 9	`9.0.36-3.45.1`	Not reported	SUSE-SU-2020:2037-1	Not reported
Suse	tomcat	rpm	openstack cloud crowbar 9	`9.0.36-3.45.1`	Not reported	SUSE-SU-2020:2037-1	Not reported
Suse	tomcat	rpm	linux enterprise server for sap applications 12 sp4	`9.0.36-3.45.1`	Not reported	SUSE-SU-2020:2037-1	Not reported
Suse	tomcat	rpm	linux enterprise server 12 sp4-ltss	`9.0.36-3.45.1`	Not reported	SUSE-SU-2020:2037-1	Not reported
Suse	tomcat	rpm	linux enterprise server 12 sp5	`9.0.36-3.45.1`	Not reported	SUSE-SU-2020:2037-1	Not reported
Suse	tomcat	rpm	linux enterprise server for sap applications 12 sp5	`9.0.36-3.45.1`	Not reported	SUSE-SU-2020:2037-1	Not reported
Suse	tomcat	rpm	linux enterprise high performance computing 15-espos	`9.0.36-3.65.2`	Not reported	SUSE-SU-2020:2045-1	Not reported
Suse	tomcat	rpm	linux enterprise high performance computing 15-ltss	`9.0.36-3.65.2`	Not reported	SUSE-SU-2020:2045-1	Not reported
Suse	tomcat	rpm	linux enterprise server 15-ltss	`9.0.36-3.65.2`	Not reported	SUSE-SU-2020:2045-1	Not reported
Suse	tomcat	rpm	linux enterprise server for sap applications 15	`9.0.36-3.65.2`	Not reported	SUSE-SU-2020:2045-1	Not reported
Opensuse	tomcat	rpm	leap 15.2	`9.0.36-lp152.2.4.1`	Not reported	OPENSUSE-SU-2020:1111-1	Not reported
Opensuse	tomcat	rpm	leap 15.1	`9.0.36-lp151.3.27.1`	Not reported	OPENSUSE-SU-2020:1102-1	Not reported
Suse	tomcat	rpm	linux enterprise module for web and scripting 15 sp1	`9.0.36-4.41.2`	Not reported	SUSE-SU-2020:2046-1	Not reported
Suse	tomcat	rpm	linux enterprise module for web and scripting 15 sp2	`9.0.36-3.6.1`	Not reported	SUSE-SU-2020:2047-1	Not reported
Opensuse	tomcat	rpm	tumbleweed	`9.0.43-8.1`	Not reported	OPENSUSE-SU-2024:12103-1	Not reported

OpenFactory catalog packages

[openSUSE Tumbleweed]

[tomcat-admin-webapps]Unknown
Source package: [tomcat]
Details (1)
- 9.0.120-2.1 · noarch · tumbleweed
  Unknown · Fixed: 9.0.43-8.1
  Version impact unknown
  nvd · tomcat · opensuse · tumbleweed
[tomcat-docs-webapp]Unknown
Source package: [tomcat]
Details (1)
- 9.0.120-2.1 · noarch · tumbleweed
  Unknown · Fixed: 9.0.43-8.1
  Version impact unknown
  nvd · tomcat · opensuse · tumbleweed
[tomcat-el-3_0-api]Unknown
Source package: [tomcat]
Details (1)
- 9.0.120-2.1 · noarch · tumbleweed
  Unknown · Fixed: 9.0.43-8.1
  Version impact unknown
  nvd · tomcat · opensuse · tumbleweed
[tomcat-embed]Unknown
Source package: [tomcat]
Details (1)
- 9.0.120-2.1 · noarch · tumbleweed
  Unknown · Fixed: 9.0.43-8.1
  Version impact unknown
  nvd · tomcat · opensuse · tumbleweed
[tomcat-javadoc]Unknown
Source package: [tomcat]
Details (1)
- 9.0.120-2.1 · noarch · tumbleweed
  Unknown · Fixed: 9.0.43-8.1
  Version impact unknown
  nvd · tomcat · opensuse · tumbleweed
[tomcat-jsp-2_3-api]Unknown
Source package: [tomcat]
Details (1)
- 9.0.120-2.1 · noarch · tumbleweed
  Unknown · Fixed: 9.0.43-8.1
  Version impact unknown
  nvd · tomcat · opensuse · tumbleweed
[tomcat-jsvc]Unknown
Source package: [tomcat]
Details (1)
- 9.0.120-2.1 · noarch · tumbleweed
  Unknown · Fixed: 9.0.43-8.1
  Version impact unknown
  nvd · tomcat · opensuse · tumbleweed
[tomcat-lib]Unknown
Source package: [tomcat]
Details (1)
- 9.0.120-2.1 · noarch · tumbleweed
  Unknown · Fixed: 9.0.43-8.1
  Version impact unknown
  nvd · tomcat · opensuse · tumbleweed
[tomcat-servlet-4_0-api]Unknown
Source package: [tomcat]
Details (1)
- 9.0.120-2.1 · noarch · tumbleweed
  Unknown · Fixed: 9.0.43-8.1
  Version impact unknown
  nvd · tomcat · opensuse · tumbleweed
[tomcat-webapps]Unknown
Source package: [tomcat]
Details (1)
- 9.0.120-2.1 · noarch · tumbleweed
  Unknown · Fixed: 9.0.43-8.1
  Version impact unknown
  nvd · tomcat · opensuse · tumbleweed
[tomcat]Fixed
Source package: [tomcat]
Details (1)
- 9.0.120-2.1 · noarch · tumbleweed
  Fixed · Fixed: 9.0.43-8.1
  nvd · tomcat · opensuse · tumbleweed

[Debian 12 (Bookworm)]

[libtomcat9-java]Fixed
Source package: [tomcat9]
Details (2)
- 9.0.70-2 · all · bookworm
  Fixed · Fixed: 9.0.37-1
  nvd · tomcat9 · debian · bookworm; nvd · tomcat9 · debian · 12
- 9.0.70-2 · all · bookworm
  Fixed · Fixed: 9.0.37-1
  nvd · tomcat9 · debian · bookworm; nvd · tomcat9 · debian · 12

[Debian 13 (Trixie)]

[libtomcat9-java]Fixed
Source package: [tomcat9]
Details (2)
- 9.0.95-1 · all · trixie
  Fixed · Fixed: 9.0.37-1
  nvd · tomcat9 · debian · 13
- 9.0.95-1 · all · trixie
  Fixed · Fixed: 9.0.37-1
  nvd · tomcat9 · debian · 13

Observed: Oct 23, 2026, 5:47:44 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]