Vulnerability in Apache Tomcat
CVE-2020-11996
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.267 (98.0th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 98.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.267 · newest: 0.267 · change: 0.000
Affected products
- Apache Tomcat — versions 10.0.0-M1 to 10.0.0-M5, 9.0.0.M1 to 9.0.35, 8.5.0 to 8.5.55
- Apache Tomcat — versions 9.0.0, 10.0.0
- NetApp Oncommand System Manager — versions 3.0, 3.1.3
- Oracle MySQL Enterprise Monitor
- Oracle Siebel Ui Framework
- Oracle Workload Manager — versions 12.2.0.1, 18c, 19c
- Canonical Ubuntu Linux — versions 20.04
- Debian Linux — versions 9.0, 10.0
- openSUSE Leap — versions 15.1, 15.2
Public proof-of-concept exploits
References
- lists.apache.org/thread.html/r5541ef6b6b68b49f76fc4c45695940116da2bcbe0312ef204… (Mailing List, Vendor Advisory)
- lists.apache.org/thread.html/ra7092f7492569b39b04ec0decf52628ba86c51f15efb38f58… (mailing-list)
- lists.apache.org/thread.html/rb4ee49ecc4c59620ffd5e66e84a17e526c2c3cfa95d0cd682… (mailing-list)
- lists.apache.org/thread.html/rb820f1a2a02bf07414be12c653c2ab5321fd87b9bf6c5e635… (mailing-list)
- lists.apache.org/thread.html/r8f7484589454638af527182ae55ef5b628ba00c05c5b11887… (mailing-list)
- lists.apache.org/thread.html/r74f5a8204efe574cbfcd95b2a16236fe95beb45c4d9fee3dc… (mailing-list)
- lists.apache.org/thread.html/rea65d6ef2e45dd1c45faae83922042732866c7b88fa109b76… (mailing-list)
- lists.apache.org/thread.html/rc80b96b4b96618b2b7461cb90664a428cfd6605eea9f74e51… (mailing-list)
- lists.apache.org/thread.html/r93ca628ef3a4530dfe5ac49fddc795f0920a4b2a408b57a30… (mailing-list)
- lists.apache.org/thread.html/r8f3d416c193bc9384a8a7dd368623d441f5fcaff105711500… (mailing-list)
Frequently asked questions
- What is CVE-2020-11996?
- CVE-2020-11996 is a high-severity vulnerability in Apache Tomcat. CVSS score: 7.5/10. Published 2020-06-26.
- How severe is CVE-2020-11996?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2020-11996 known to be exploited?
- 15 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.