UBUNTU-CVE-2020-11996
- Source
- https://ubuntu.com/security/CVE-2020-11996
- Import Source
- https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-11996.json
- JSON Data
- https://api.osv.dev/v1/vulns/UBUNTU-CVE-2020-11996
- Upstream
- Downstream
- Related
- Published
- 2020-06-26T17:15:00Z
- Modified
- 2025-09-08T16:46:05Z
- Severity
-
- 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Ubuntu - medium
- Summary
- [none]
- Details
-
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.
- References
-
- https://ubuntu.com/security/CVE-2020-11996
- https://www.openwall.com/lists/oss-security/2020/06/25/6
- https://github.com/apache/tomcat/commit/9a0231683a77e2957cea0fdee88b193b30b0c976
- https://github.com/apache/tomcat/commit/c8acd2ab7371e39aeca7c306f3b5380f00afe552
- https://lists.apache.org/thread.html/r5541ef6b6b68b49f76fc4c45695940116da2bcbe0312ef204a00a2e0%40%3Cannounce.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/r74f5a8204efe574cbfcd95b2a16236fe95beb45c4d9fee3dc789dca9@%3Ccommits.ofbiz.apache.org%3E
- https://lists.apache.org/thread.html/r8f3d416c193bc9384a8a7dd368623d441f5fcaff1057115008100561@%3Ccommits.ofbiz.apache.org%3E
- https://lists.apache.org/thread.html/r8f7484589454638af527182ae55ef5b628ba00c05c5b11887c922fb1@%3Cnotifications.ofbiz.apache.org%3E
- https://lists.apache.org/thread.html/r93ca628ef3a4530dfe5ac49fddc795f0920a4b2a408b57a30926a42b@%3Ccommits.ofbiz.apache.org%3E
- https://lists.apache.org/thread.html/ra7092f7492569b39b04ec0decf52628ba86c51f15efb38f5853e2760@%3Cnotifications.ofbiz.apache.org%3E
- https://lists.apache.org/thread.html/rb4ee49ecc4c59620ffd5e66e84a17e526c2c3cfa95d0cd682d90d338@%3Cnotifications.ofbiz.apache.org%3E
- https://lists.apache.org/thread.html/rb820f1a2a02bf07414be12c653c2ab5321fd87b9bf6c5e635c53ff4b@%3Cnotifications.ofbiz.apache.org%3E
- https://lists.apache.org/thread.html/rc80b96b4b96618b2b7461cb90664a428cfd6605eea9f74e51b792542@%3Cnotifications.ofbiz.apache.org%3E
- https://lists.apache.org/thread.html/rea65d6ef2e45dd1c45faae83922042732866c7b88fa109b76c83db52@%3Cnotifications.ofbiz.apache.org%3E
- https://ubuntu.com/security/notices/USN-4596-1
- https://www.cve.org/CVERecord?id=CVE-2020-11996
Affected packages
Ubuntu:Pro:18.04:LTS / tomcat8
Package
- Name
- tomcat8
- Purl
- pkg:deb/ubuntu/tomcat8@8.5.39-1ubuntu1~18.04.3+esm5?arch=source&distro=esm-apps/bionic
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affected
Affected versions
8.*
8.5.21-1ubuntu1
8.5.29-1
8.5.30-1
8.5.30-1ubuntu1
8.5.30-1ubuntu1.2
8.5.30-1ubuntu1.3
8.5.30-1ubuntu1.4
8.5.39-1ubuntu1~18.04.1
8.5.39-1ubuntu1~18.04.2
8.5.39-1ubuntu1~18.04.3
8.5.39-1ubuntu1~18.04.3+esm1
8.5.39-1ubuntu1~18.04.3+esm2
8.5.39-1ubuntu1~18.04.3+esm3
8.5.39-1ubuntu1~18.04.3+esm4
8.5.39-1ubuntu1~18.04.3+esm5
Ecosystem specific
{
"binaries": [
{
"binary_version": "8.5.39-1ubuntu1~18.04.3+esm5",
"binary_name": "libtomcat8-embed-java"
},
{
"binary_version": "8.5.39-1ubuntu1~18.04.3+esm5",
"binary_name": "libtomcat8-java"
},
{
"binary_version": "8.5.39-1ubuntu1~18.04.3+esm5",
"binary_name": "tomcat8"
},
{
"binary_version": "8.5.39-1ubuntu1~18.04.3+esm5",
"binary_name": "tomcat8-admin"
},
{
"binary_version": "8.5.39-1ubuntu1~18.04.3+esm5",
"binary_name": "tomcat8-common"
},
{
"binary_version": "8.5.39-1ubuntu1~18.04.3+esm5",
"binary_name": "tomcat8-docs"
},
{
"binary_version": "8.5.39-1ubuntu1~18.04.3+esm5",
"binary_name": "tomcat8-examples"
},
{
"binary_version": "8.5.39-1ubuntu1~18.04.3+esm5",
"binary_name": "tomcat8-user"
}
]
}
Ubuntu:Pro:18.04:LTS / tomcat9
Package
- Name
- tomcat9
- Purl
- pkg:deb/ubuntu/tomcat9@9.0.16-3ubuntu0.18.04.2+esm7?arch=source&distro=esm-apps/bionic
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affected
Affected versions
9.*
9.0.16-3~18.04.1
9.0.16-3ubuntu0.18.04.1
9.0.16-3ubuntu0.18.04.2
9.0.16-3ubuntu0.18.04.2+esm1
9.0.16-3ubuntu0.18.04.2+esm2
9.0.16-3ubuntu0.18.04.2+esm3
9.0.16-3ubuntu0.18.04.2+esm4
9.0.16-3ubuntu0.18.04.2+esm5
9.0.16-3ubuntu0.18.04.2+esm6
9.0.16-3ubuntu0.18.04.2+esm7
Ecosystem specific
{
"binaries": [
{
"binary_version": "9.0.16-3ubuntu0.18.04.2+esm7",
"binary_name": "libtomcat9-embed-java"
},
{
"binary_version": "9.0.16-3ubuntu0.18.04.2+esm7",
"binary_name": "libtomcat9-java"
},
{
"binary_version": "9.0.16-3ubuntu0.18.04.2+esm7",
"binary_name": "tomcat9"
},
{
"binary_version": "9.0.16-3ubuntu0.18.04.2+esm7",
"binary_name": "tomcat9-admin"
},
{
"binary_version": "9.0.16-3ubuntu0.18.04.2+esm7",
"binary_name": "tomcat9-common"
},
{
"binary_version": "9.0.16-3ubuntu0.18.04.2+esm7",
"binary_name": "tomcat9-docs"
},
{
"binary_version": "9.0.16-3ubuntu0.18.04.2+esm7",
"binary_name": "tomcat9-examples"
},
{
"binary_version": "9.0.16-3ubuntu0.18.04.2+esm7",
"binary_name": "tomcat9-user"
}
]
}
Ubuntu:20.04:LTS / tomcat9
Package
- Name
- tomcat9
- Purl
- pkg:deb/ubuntu/tomcat9@9.0.31-1ubuntu0.1?arch=source&distro=focal
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affectedFixed9.0.31-1ubuntu0.1
Ecosystem specific
{
"availability": "No subscription required",
"binaries": [
{
"binary_version": "9.0.31-1ubuntu0.1",
"binary_name": "libtomcat9-embed-java"
},
{
"binary_version": "9.0.31-1ubuntu0.1",
"binary_name": "libtomcat9-java"
},
{
"binary_version": "9.0.31-1ubuntu0.1",
"binary_name": "tomcat9"
},
{
"binary_version": "9.0.31-1ubuntu0.1",
"binary_name": "tomcat9-admin"
},
{
"binary_version": "9.0.31-1ubuntu0.1",
"binary_name": "tomcat9-common"
},
{
"binary_version": "9.0.31-1ubuntu0.1",
"binary_name": "tomcat9-docs"
},
{
"binary_version": "9.0.31-1ubuntu0.1",
"binary_name": "tomcat9-examples"
},
{
"binary_version": "9.0.31-1ubuntu0.1",
"binary_name": "tomcat9-user"
}
]
}