CVE-2020-13934An 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.
Updated under an hour ago ()
Does this affect you?
It affects apache tomcat and 13 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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.
- 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 tomcat apache:tomcat | from 8.5.1 through 8.5.56; from 9.0.1 through 9.0.36; 9.0.0; 9.0.0; 9.0.0; 9.0.0; 9.0.0; 9.0.0; and 23 more ranges | NVD |
debian debian_linux debian:debian_linux | 9.0; 10.0 | NVD |
netapp oncommand_system_manager netapp:oncommand_system_manager | from 3.0.0 through 3.1.3 | NVD |
opensuse leap opensuse:leap | 15.1; 15.2 | NVD |
canonical ubuntu_linux canonical:ubuntu_linux | 20.04 | NVD |
oracle agile_engineering_data_management oracle:agile_engineering_data_management | 6.2.1.0 | NVD |
oracle agile_product_lifecycle_management oracle:agile_product_lifecycle_management | 9.3.3; 9.3.5; 9.3.6 | NVD |
oracle communications_instant_messaging_server oracle:communications_instant_messaging_server | 10.0.1.5.0 | NVD |
oracle fmw_platform oracle:fmw_platform | 12.2.1.3.0; 12.2.1.4.0 | NVD |
oracle instantis_enterprisetrack oracle:instantis_enterprisetrack | 17.1; 17.2; 17.3 | NVD |
oracle managed_file_transfer oracle:managed_file_transfer | 12.2.1.3.0; 12.2.1.4.0 | 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 |
References
- https://lists.apache.org/thread.html/r61f411cf82488d6ec213063fc15feeeb88e31b0ca9c29652ee4f962e%40%3Cannounce.tomcat.apache.org%3Ex-refsource-misc
- https://www.debian.org/security/2020/dsa-4727vendor-advisory, x-refsource-debian
- https://lists.debian.org/debian-lts-announce/2020/07/msg00017.htmlmailing-list, x-refsource-mlist
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00084.htmlvendor-advisory, x-refsource-suse
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00088.htmlvendor-advisory, x-refsource-suse
- https://lists.apache.org/thread.html/ra072b1f786e7d139e86f1d1145572e0ff71cef38a96d9c6f5362aac8%40%3Cdev.tomcat.apache.org%3Emailing-list, x-refsource-mlist
- https://www.oracle.com/security-alerts/cpuoct2020.htmlx-refsource-misc
- https://security.netapp.com/advisory/ntap-20200724-0003/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://www.oracle.com/security-alerts/cpuApr2021.htmlx-refsource-misc
- https://www.oracle.com//security-alerts/cpujul2021.htmlx-refsource-misc
- https://www.oracle.com/security-alerts/cpujan2022.htmlx-refsource-misc
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.