CVE-2020-13934
HighImproper Restriction of Operations within the Bounds of a Memory Buffer in Apache Tomcat
Published Feb 8, 2022 · Updated Oct 10, 2026 · Also known as BIT-tomcat-2020-13934, DEBIAN-CVE-2020-13934, DLA-2286-1, GHSA-vf77-8h7g-gghp, SUSE-SU-2020:2037-1, SUSE-SU-2020:2045-1, SUSE-SU-2020:2046-1, SUSE-SU-2020:2047-1, UBUNTU-CVE-2020-13934
Key Facts
Patch immediately- CVE-2020-13934 is a high-severity vulnerability (CVSS 7.5 v3.1) affecting Tomcat (Apache), Oncommand System Manager (Netapp), Agile Engineering Data Management (Oracle) and 22 more products.
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 64% probability of exploitation in the next 30 days.
- Fixed versions are available, including Tomcat <=8.5.56, Tomcat 8.5.51-4.ph1, Tomcat 8.5.51-4.ph2.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (30-day exploit likelihood)
64%
Higher than 99.2% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
None known
Get the full CVE-2020-13934 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
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.
Affected Products
267 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| TomcatApache | 10.0.0-milestone1, 10.0.0-milestone2, 10.0.0-milestone3, 10.0.0-milestone4, 10.0.0-milestone5, 10.0.0-milestone6, 9.0.0-milestone10, 9.0.0-milestone11 | 8.5.56 |
| Oncommand System ManagerNetapp | See advisory | 3.1.3 |
| Agile Engineering Data ManagementOracle | 6.2.1.0 | n/a |
| Agile PlmOracle | 9.3.3, 9.3.5, 9.3.6 | n/a |
| Agile Product Lifecycle ManagementOracle | 9.3.3, 9.3.5, 9.3.6 | n/a |
Patched Releases
Tomcat
<=8.5.56, 8.5.51-4.ph1, 8.5.51-4.ph2, 8.5.51-4.ph3, NA, 8.5.57, 9.0.115-3.160.1, 9.0.36-3.45.1, 9.0.36-3.6.1, 9.0.36-3.65.2, 9.0.36-4.41.2, 9.0.36-lp151.3.27.1, 9.0.36-lp152.2.4.1, 9.0.37, 9.0.43-8.1
tomcat-webapps
NA, 9.0.115-3.160.1, 9.0.36-3.45.1, 9.0.36-3.6.1, 9.0.36-3.65.2, 9.0.36-4.41.2, 9.0.36-lp151.3.27.1, 9.0.36-lp152.2.4.1, 9.0.43-8.1
jws5-tomcat
0:9.0.30-5.redhat_6.1.el6jws, 0:9.0.30-5.redhat_6.1.el7jws, 0:9.0.30-5.redhat_6.1.el8jws
Oncommand System Manager
<=3.1.3
Mysql Enterprise Monitor
<=8.0.21
Siebel Ui Framework
<=20.12
org.apache.tomcat:tomcat
10.0.0-M6, 8.5.56, 9.0.36
org.apache.tomcat:tomcat-coyote
10.0.0-M6, 8.5.56, 9.0.36
tomcat-admin-webapps
9.0.115-3.160.1, 9.0.36-3.45.1, 9.0.36-3.6.1, 9.0.36-3.65.2, 9.0.36-4.41.2, 9.0.36-lp151.3.27.1, 9.0.36-lp152.2.4.1, 9.0.43-8.1
tomcat-docs-webapp
9.0.115-3.160.1, 9.0.36-3.45.1, 9.0.36-lp151.3.27.1, 9.0.36-lp152.2.4.1, 9.0.43-8.1
tomcat-el-3_0-api
9.0.115-3.160.1, 9.0.36-3.45.1, 9.0.36-3.6.1, 9.0.36-3.65.2, 9.0.36-4.41.2, 9.0.36-lp151.3.27.1, 9.0.36-lp152.2.4.1, 9.0.43-8.1
tomcat-embed
9.0.36-lp151.3.27.1, 9.0.36-lp152.2.4.1, 9.0.43-8.1
tomcat-javadoc
9.0.115-3.160.1, 9.0.36-3.45.1, 9.0.36-lp151.3.27.1, 9.0.36-lp152.2.4.1, 9.0.43-8.1
tomcat-jsp-2_3-api
9.0.115-3.160.1, 9.0.36-3.45.1, 9.0.36-3.6.1, 9.0.36-3.65.2, 9.0.36-4.41.2, 9.0.36-lp151.3.27.1, 9.0.36-lp152.2.4.1, 9.0.43-8.1
tomcat-jsvc
9.0.36-lp151.3.27.1, 9.0.36-lp152.2.4.1, 9.0.43-8.1
tomcat-lib
9.0.115-3.160.1, 9.0.36-3.45.1, 9.0.36-3.6.1, 9.0.36-3.65.2, 9.0.36-4.41.2, 9.0.36-lp151.3.27.1, 9.0.36-lp152.2.4.1, 9.0.43-8.1
tomcat-servlet-4_0-api
9.0.115-3.160.1, 9.0.36-3.45.1, 9.0.36-3.6.1, 9.0.36-3.65.2, 9.0.36-4.41.2, 9.0.36-lp151.3.27.1, 9.0.36-lp152.2.4.1, 9.0.43-8.1
tomcat10
10.1.14-1.1
tomcat10-admin-webapps
10.1.14-1.1
tomcat10-doc
10.1.14-1.1
tomcat10-docs-webapp
10.1.14-1.1
tomcat10-el-5_0-api
10.1.14-1.1
tomcat10-embed
10.1.14-1.1
tomcat10-jsp-3_1-api
10.1.14-1.1
tomcat10-jsvc
10.1.14-1.1
Timeline
Publicly disclosed
Feb 8, 2022
Last updated
Oct 10, 2026
Weakness Type
- CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
- CWE-400 Uncontrolled Resource Consumption
- CWE-401 Missing Release of Memory after Effective Lifetime
- CWE-476 NULL Pointer Dereference
References
- advisoryopenSUSE-SU-2020:1102
- advisoryopenSUSE-SU-2020:1111
- advisoryRHSA-2020:3306
- advisoryRHSA-2020:3308
- advisoryRHSA-2020:3806
FAQ
Common Questions.
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.
Affected: Tomcat (Apache) versions 10.0.0-milestone1, 10.0.0-milestone2, 10.0.0-milestone3, 10.0.0-milestone4, 10.0.0-milestone5, 10.0.0-milestone6, 9.0.0-milestone10, 9.0.0-milestone11; Oncommand System Manager (Netapp); Agile Engineering Data Management (Oracle) versions 6.2.1.0, among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Tomcat <=8.5.56, Tomcat 8.5.51-4.ph1, Tomcat 8.5.51-4.ph2.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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