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High 7.5Published Jun 26, 2020
CVE-2020-11996A 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.
Updated under an hour ago ()
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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
- 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- apache
- NVD analysis
- Modified
- Record last updated
- Oct 8, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Apache Apache Tomcat apache:tomcat (from the name) | 10.0.0-M1 to 10.0.0-M5; 9.0.0.M1 to 9.0.35; 8.5.0 to 8.5.55 | CNA record |
apache tomcat apache:tomcat | from 8.5.0 through 8.5.55; from 9.0.0 through 9.0.35; 9.0.0; 9.0.0; 9.0.0; 9.0.0; 9.0.0; 9.0.0; and 26 more ranges | NVD |
canonical ubuntu_linux canonical:ubuntu_linux | 20.04 | NVD |
oracle mysql_enterprise_monitor oracle:mysql_enterprise_monitor | through 8.0.21 | NVD |
oracle siebel_ui_framework oracle:siebel_ui_framework | through 20.12 | NVD |
oracle workload_manager oracle:workload_manager | 12.2.0.1; 18c; 19c | NVD |
opensuse leap opensuse:leap | 15.1; 15.2 | NVD |
debian debian_linux debian:debian_linux | 9.0; 10.0 | NVD |
netapp oncommand_system_manager netapp:oncommand_system_manager | 3.0; 3.1.3 | NVD |
References
- https://lists.apache.org/thread.html/r5541ef6b6b68b49f76fc4c45695940116da2bcbe0312ef204a00a2e0%40%3Cannounce.tomcat.apache.org%3Ex-refsource-confirm
- https://lists.apache.org/thread.html/ra7092f7492569b39b04ec0decf52628ba86c51f15efb38f5853e2760%40%3Cnotifications.ofbiz.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/rb4ee49ecc4c59620ffd5e66e84a17e526c2c3cfa95d0cd682d90d338%40%3Cnotifications.ofbiz.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/rb820f1a2a02bf07414be12c653c2ab5321fd87b9bf6c5e635c53ff4b%40%3Cnotifications.ofbiz.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/r8f7484589454638af527182ae55ef5b628ba00c05c5b11887c922fb1%40%3Cnotifications.ofbiz.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/r74f5a8204efe574cbfcd95b2a16236fe95beb45c4d9fee3dc789dca9%40%3Ccommits.ofbiz.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/rea65d6ef2e45dd1c45faae83922042732866c7b88fa109b76c83db52%40%3Cnotifications.ofbiz.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/rc80b96b4b96618b2b7461cb90664a428cfd6605eea9f74e51b792542%40%3Cnotifications.ofbiz.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/r93ca628ef3a4530dfe5ac49fddc795f0920a4b2a408b57a30926a42b%40%3Ccommits.ofbiz.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/r8f3d416c193bc9384a8a7dd368623d441f5fcaff1057115008100561%40%3Ccommits.ofbiz.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/r9ad911fe49450ed9405827af0e7a74104041081ff91864b1f2546bbd%40%3Cnotifications.ofbiz.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/ref0339792ac6dac1dba83c071a727ad72380899bde60f6aaad4031b9%40%3Cnotifications.ofbiz.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/r6c29801370a36c1a5159679269777ad0c73276d3015b8bbefea66e5c%40%3Cnotifications.ofbiz.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/r3ea96d8f36dd404acce83df8aeb22a9e807d6c13ca9c5dec72f872cd%40%3Cnotifications.ofbiz.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.debian.org/debian-lts-announce/2020/07/msg00010.htmlmailing-list, x-refsource-mlist
- https://www.debian.org/security/2020/dsa-4727vendor-advisory, x-refsource-debian
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00064.htmlvendor-advisory, x-refsource-suse
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00072.htmlvendor-advisory, x-refsource-suse
- https://lists.apache.org/thread.html/r2529016c311ce9485e6f173446d469600fdfbb94dccadfcd9dfdac79%40%3Cusers.tomcat.apache.org%3Emailing-list, x-refsource-mlist
- https://www.oracle.com/security-alerts/cpuoct2020.htmlx-refsource-misc
- https://security.netapp.com/advisory/ntap-20200709-0002/x-refsource-confirm
- https://usn.ubuntu.com/4596-1/vendor-advisory, x-refsource-ubuntu
- https://www.oracle.com/security-alerts/cpujan2021.htmlx-refsource-misc
- https://lists.apache.org/thread.html/r5a4f80a6acc6607d61dae424b643b594c6188dd4e1eff04705c10db2%40%3Cnotifications.ofbiz.apache.org%3Emailing-list, x-refsource-mlist
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.