CVE-2020-13935

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 86.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-07-14 · updated 2026-10-08
Weakness: CWE-835

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

Apache Tomcat: from 7.0.27 through 7.0.104; from 8.5.0 through 8.5.56; from 9.0.1 through 9.0.36; 9.0.0-milestone1, 9.0.0-milestone10, 9.0.0-milestone11, 9.0.0-milestone12, 9.0.0-milestone13, 9.0.0-milestone14 (+27)
Canonical Ubuntu Linux: 16.04, 20.04
Debian Linux: 9.0, 10.0
McAfee,LLC McAfee ePolicy Orchestrator (ePO): 5.9.0, 5.9.1, 5.10.0, 5.10.0-update_1, 5.10.0-update_2, 5.10.0-update_3 (+5)
OnCommand System Manager 9.x: from 3.0.0 through 3.1.3
openSUSE Leap: 15.1, 15.2
Oracle Corporation Oracle Agile Engineering Data Management: 6.2.1.0
Oracle Corporation Oracle Agile PLM: 9.3.3, 9.3.5, 9.3.6
Oracle Blockchain Platform: before 21.1.2 — fixed in 21.1.2
Oracle Corporation Oracle Commerce Guided Search / Oracle Commerce Experience Manager: 11.3.2
Oracle Communications Cloud Native Core Policy: 1.14.0
Oracle Communications Instant Messaging Server: 10.0.1.5.0
Oracle Fmw Platform: 12.2.1.3.0, 12.2.1.4.0
Oracle Instantis Enterprisetrack: 17.1, 17.2, 17.3
Oracle Corporation Oracle Managed File Transfer: 12.2.1.3.0, 12.2.1.4.0
Oracle Corporation MySQL Enterprise Monitor: through 8.0.21
Oracle Corporation Siebel UI Framework: through 20.12
Oracle Workload Manager: 12.2.0.1, 18c, 19c

How to fix

Upgrade to a fixed version: Oracle Blockchain Platform 21.1.2. Check the vendor advisory for mitigations.

References

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