CVE-2020-13935
HighInfinite Loop in Apache Tomcat
Published Feb 8, 2022 · Updated Oct 10, 2026 · Also known as BIT-tomcat-2020-13935, DEBIAN-CVE-2020-13935, GHSA-m7jv-hq7h-mq7c, SUSE-SU-2020:2611-1, UBUNTU-CVE-2020-13935, USN-4448-1
Key Facts
Patch immediately- CVE-2020-13935 is a high-severity vulnerability (CVSS 7.5 v3.1) affecting Tomcat (Apache), Epolicy Orchestrator (Mcafee), Oncommand System Manager (Netapp) and 22 more products.
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 87% probability of exploitation in the next 30 days.
- Fixed versions are available, including Tomcat <=7.0.104, 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)
87%
Higher than 99.7% 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-2020-13935 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
The payload length in a WebSocket frame was not correctly validated in Apache Tomcat 10.0.0-M1 to 10.0.0-M6, 9.0.0.M1 to 9.0.36, 8.5.0 to 8.5.56 and 7.0.27 to 7.0.104. Invalid payload lengths could trigger an infinite loop. Multiple requests with invalid payload lengths could lead to a denial of service.
Affected Products
558 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-milestone1, 9.0.0-milestone10 | 7.0.104 |
| Epolicy OrchestratorMcafee | 5.10.0, 5.10.0-update_1, 5.10.0-update_2, 5.10.0-update_3, 5.10.0-update_4, 5.10.0-update_5, 5.10.0-update_6, 5.10.0-update_7 | n/a |
| 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 |
Patched Releases
Tomcat
<=7.0.104, 8.5.51-4.ph1, 8.5.51-4.ph2, 8.5.51-4.ph3, NA, 0:7.0.76-15.el7, 7.0.105, 7.0.76-10.amzn2.0.4, 7.0.76-15.el7, 8.0.53-29.37.1, 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, 7.0.76-10.amzn2.0.4, 7.0.76-15.el7, 8.0.53-29.37.1, 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
jboss-as-appclient
0:7.5.24-2.Final_redhat_00001.1.ep6.el6, 0:7.5.24-2.Final_redhat_00001.1.ep6.el7
jboss-as-cli
0:7.5.24-2.Final_redhat_00001.1.ep6.el6, 0:7.5.24-2.Final_redhat_00001.1.ep6.el7
jboss-as-client-all
0:7.5.24-2.Final_redhat_00001.1.ep6.el6, 0:7.5.24-2.Final_redhat_00001.1.ep6.el7
jboss-as-clustering
0:7.5.24-2.Final_redhat_00001.1.ep6.el6, 0:7.5.24-2.Final_redhat_00001.1.ep6.el7
jboss-as-cmp
0:7.5.24-2.Final_redhat_00001.1.ep6.el6, 0:7.5.24-2.Final_redhat_00001.1.ep6.el7
jboss-as-configadmin
0:7.5.24-2.Final_redhat_00001.1.ep6.el6, 0:7.5.24-2.Final_redhat_00001.1.ep6.el7
jboss-as-connector
0:7.5.24-2.Final_redhat_00001.1.ep6.el6, 0:7.5.24-2.Final_redhat_00001.1.ep6.el7
jboss-as-controller
0:7.5.24-2.Final_redhat_00001.1.ep6.el6, 0:7.5.24-2.Final_redhat_00001.1.ep6.el7
jboss-as-controller-client
0:7.5.24-2.Final_redhat_00001.1.ep6.el6, 0:7.5.24-2.Final_redhat_00001.1.ep6.el7
jboss-as-core-security
0:7.5.24-2.Final_redhat_00001.1.ep6.el6, 0:7.5.24-2.Final_redhat_00001.1.ep6.el7
jboss-as-deployment-repository
0:7.5.24-2.Final_redhat_00001.1.ep6.el6, 0:7.5.24-2.Final_redhat_00001.1.ep6.el7
jboss-as-deployment-scanner
0:7.5.24-2.Final_redhat_00001.1.ep6.el6, 0:7.5.24-2.Final_redhat_00001.1.ep6.el7
jboss-as-domain-http
0:7.5.24-2.Final_redhat_00001.1.ep6.el6, 0:7.5.24-2.Final_redhat_00001.1.ep6.el7
jboss-as-domain-management
0:7.5.24-2.Final_redhat_00001.1.ep6.el6, 0:7.5.24-2.Final_redhat_00001.1.ep6.el7
jboss-as-ee
0:7.5.24-2.Final_redhat_00001.1.ep6.el6, 0:7.5.24-2.Final_redhat_00001.1.ep6.el7
jboss-as-ee-deployment
0:7.5.24-2.Final_redhat_00001.1.ep6.el6, 0:7.5.24-2.Final_redhat_00001.1.ep6.el7
jboss-as-ejb3
0:7.5.24-2.Final_redhat_00001.1.ep6.el6, 0:7.5.24-2.Final_redhat_00001.1.ep6.el7
jboss-as-embedded
0:7.5.24-2.Final_redhat_00001.1.ep6.el6, 0:7.5.24-2.Final_redhat_00001.1.ep6.el7
jboss-as-host-controller
0:7.5.24-2.Final_redhat_00001.1.ep6.el6, 0:7.5.24-2.Final_redhat_00001.1.ep6.el7
jboss-as-jacorb
0:7.5.24-2.Final_redhat_00001.1.ep6.el6, 0:7.5.24-2.Final_redhat_00001.1.ep6.el7
jboss-as-jaxr
0:7.5.24-2.Final_redhat_00001.1.ep6.el6, 0:7.5.24-2.Final_redhat_00001.1.ep6.el7
jboss-as-jaxrs
0:7.5.24-2.Final_redhat_00001.1.ep6.el6, 0:7.5.24-2.Final_redhat_00001.1.ep6.el7
jboss-as-jdr
0:7.5.24-2.Final_redhat_00001.1.ep6.el6, 0:7.5.24-2.Final_redhat_00001.1.ep6.el7
Timeline
Publicly disclosed
Feb 8, 2022
Last updated
Oct 10, 2026
Weakness Type
- CWE-400 Uncontrolled Resource Consumption
- CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')
References
- advisoryopenSUSE-SU-2020:1102
- advisoryopenSUSE-SU-2020:1111
- advisoryRHSA-2020:3303
- advisoryRHSA-2020:3305
- advisoryRHSA-2020:3306
FAQ
Common Questions.
The payload length in a WebSocket frame was not correctly validated in Apache Tomcat 10.0.0-M1 to 10.0.0-M6, 9.0.0.M1 to 9.0.36, 8.5.0 to 8.5.56 and 7.0.27 to 7.0.104.
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-milestone1, 9.0.0-milestone10; Epolicy Orchestrator (Mcafee) versions 5.10.0, 5.10.0-update_1, 5.10.0-update_2, 5.10.0-update_3, 5.10.0-update_4, 5.10.0-update_5, 5.10.0-update_6, 5.10.0-update_7; Oncommand System Manager (Netapp), 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 <=7.0.104, 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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