Vulnerability · Published Jun 26, 2020 · Assigned by apache
CVE-2020-11996
High 7.5
In plain English
A high-severity security flaw in Apache Tomcat from Apache. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 26.7% (higher than 98% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)7.5High
Exploit odds (30 days)26.7%top 2.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | tomcat9 | 9.0.36-1 | DEBIAN-CVE-2020-11996 |
| Debian:13 | tomcat9 | 9.0.36-1 | DEBIAN-CVE-2020-11996 |
| Debian:14 | tomcat9 | 9.0.36-1 | DEBIAN-CVE-2020-11996 |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | 9.0.35 | GHSA-53hp-jpwq-2jgq |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | 10.0.0-M5 | GHSA-53hp-jpwq-2jgq |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | 8.5.55 | GHSA-53hp-jpwq-2jgq |
| Maven | org.apache.tomcat:tomcat | 10.0.0-M5 | GHSA-53hp-jpwq-2jgq |
| Maven | org.apache.tomcat:tomcat | 8.5.55 | GHSA-53hp-jpwq-2jgq |
| Maven | org.apache.tomcat:tomcat | 9.0.35 | GHSA-53hp-jpwq-2jgq |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache | Apache Tomcat | 10.0.0-M1 to 10.0.0-M59.0.0.M1 to 9.0.358.5.0 to 8.5.55 |
References
- https://lists.apache.org/thread.html/r5541ef6b6b68b49f76fc4c45695940116da2bcbe0312ef204a00a2e0%40%3Cannounce.tomcat.apache.org%3E x_refsource_CONFIRM
- [ofbiz-notifications] 20200628 [jira] [Updated] (OFBIZ-11847) CLONE - Upgrade Tomcat from 9.0.34 to 9.0.36 (CVE-2020-11996) mailing-list, x_refsource_MLIST
- [ofbiz-notifications] 20200628 [jira] [Closed] (OFBIZ-11847) CLONE - Upgrade Tomcat from 9.0.34 to 9.0.36 (CVE-2020-11996) mailing-list, x_refsource_MLIST
- [ofbiz-notifications] 20200628 [jira] [Created] (OFBIZ-11848) Upgrade Tomcat from 9.0.34 to 9.0.36 (CVE-2020-11996) mailing-list, x_refsource_MLIST
- [ofbiz-notifications] 20200628 [jira] [Created] (OFBIZ-11847) CLONE - Upgrade Tomcat from 9.0.34 to 9.0.36 (CVE-2020-11996) mailing-list, x_refsource_MLIST
- [ofbiz-commits] 20200628 [ofbiz-framework] branch release18.12 updated: Fixed: Upgrades Tomcat to 9.0.36 due to CVE-2020-11996 (OFBIZ-11848) mailing-list, x_refsource_MLIST
- [ofbiz-notifications] 20200628 [jira] [Closed] (OFBIZ-11848) Upgrade Tomcat from 9.0.34 to 9.0.36 (CVE-2020-11996) mailing-list, x_refsource_MLIST
- [ofbiz-notifications] 20200628 [jira] [Commented] (OFBIZ-11848) Upgrade Tomcat from 9.0.34 to 9.0.36 (CVE-2020-11996) mailing-list, x_refsource_MLIST
- [ofbiz-commits] 20200628 [ofbiz-framework] branch release17.12 updated: Fixed: Upgrades Tomcat to 9.0.36 due to CVE-2020-11996 (OFBIZ-11848) mailing-list, x_refsource_MLIST
- [ofbiz-commits] 20200628 [ofbiz-framework] branch trunk updated: Fixed: Upgrades Tomcat to 9.0.36 due to CVE-2020-11996 (OFBIZ-11848) mailing-list, x_refsource_MLIST
- [ofbiz-notifications] 20200701 [jira] [Reopened] (OFBIZ-11848) Upgrade Tomcat from 9.0.34 to 9.0.36 (CVE-2020-11996) mailing-list, x_refsource_MLIST
- [ofbiz-notifications] 20200703 [jira] [Comment Edited] (OFBIZ-11848) Upgrade Tomcat from 9.0.34 to 9.0.36 (CVE-2020-11996) mailing-list, x_refsource_MLIST
- [ofbiz-notifications] 20200703 [jira] [Closed] (OFBIZ-11848) Upgrade Tomcat from 9.0.34 to 9.0.36 (CVE-2020-11996) mailing-list, x_refsource_MLIST
- [ofbiz-notifications] 20200703 [jira] [Commented] (OFBIZ-11848) Upgrade Tomcat from 9.0.34 to 9.0.36 (CVE-2020-11996) mailing-list, x_refsource_MLIST
- [debian-lts-announce] 20200712 [SECURITY] [DLA 2279-1] tomcat8 security update mailing-list, x_refsource_MLIST
- DSA-4727 vendor-advisory, x_refsource_DEBIAN
- openSUSE-SU-2020:1051 vendor-advisory, x_refsource_SUSE
- openSUSE-SU-2020:1063 vendor-advisory, x_refsource_SUSE
- [tomcat-users] 20201008 Is Tomcat7 supports HTTP2 mailing-list, x_refsource_MLIST
- https://www.oracle.com/security-alerts/cpuoct2020.html x_refsource_MISC
- https://security.netapp.com/advisory/ntap-20200709-0002/ x_refsource_CONFIRM
- USN-4596-1 vendor-advisory, x_refsource_UBUNTU
- https://www.oracle.com/security-alerts/cpujan2021.html x_refsource_MISC
- [ofbiz-notifications] 20210301 [jira] [Updated] (OFBIZ-11848) Upgrade Tomcat from 9.0.34 to 9.0.36 (CVE-2020-11996) mailing-list, x_refsource_MLIST