--- id: CVE-2020-13935 title: >- 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 summary: >- 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 requ… severity: high cvss: 7.5 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H' cwe: - CWE-835 vendor: apache product: tomcat affected: - 'tomcat >= 7.0.27, <= 7.0.104' - 'tomcat >= 8.5.0, <= 8.5.56' - 'tomcat >= 9.0.1, <= 9.0.36' - tomcat = 9.0.0 - tomcat = 10.0.0 - debian_linux = 9.0 - debian_linux = 10.0 - 'oncommand_system_manager >= 3.0.0, <= 3.1.3' - leap = 15.1 - leap = 15.2 - ubuntu_linux = 16.04 - ubuntu_linux = 20.04 - epolicy_orchestrator = 5.9.0 - epolicy_orchestrator = 5.9.1 - epolicy_orchestrator = 5.10.0 - agile_engineering_data_management = 6.2.1.0 - agile_product_lifecycle_management = 9.3.3 - agile_product_lifecycle_management = 9.3.5 - agile_product_lifecycle_management = 9.3.6 - blockchain_platform < 21.1.2 - commerce_guided_search = 11.3.2 - communications_cloud_native_core_policy = 1.14.0 - communications_instant_messaging_server = 10.0.1.5.0 - fmw_platform = 12.2.1.3.0 - fmw_platform = 12.2.1.4.0 - instantis_enterprisetrack = 17.1 - instantis_enterprisetrack = 17.2 - instantis_enterprisetrack = 17.3 - managed_file_transfer = 12.2.1.3.0 - managed_file_transfer = 12.2.1.4.0 - mysql_enterprise_monitor <= 8.0.21 - siebel_ui_framework <= 20.12 - workload_manager = 12.2.0.1 - workload_manager = 18c - workload_manager = 19c patched: - blockchain_platform 21.1.2 published: '2020-07-14' updated: '2026-08-25' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2020-13935' references: - url: 'http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00084.html' label: security@apache.org - url: 'http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00088.html' label: security@apache.org - url: 'https://kc.mcafee.com/corporate/index?page=content&id=SB10332' label: security@apache.org - url: >- https://lists.apache.org/thread.html/r4e5d3c09f4dd2923191e972408b40fb8b42dbff0bc7904d44b651e50%40%3Cusers.tomcat.apache.org%3E label: security@apache.org - url: >- https://lists.apache.org/thread.html/rd48c72bd3255bda87564d4da3791517c074d94f8a701f93b85752651%40%3Cannounce.tomcat.apache.org%3E label: security@apache.org - url: 'https://lists.debian.org/debian-lts-announce/2020/07/msg00017.html' label: security@apache.org - url: 'https://security.netapp.com/advisory/ntap-20200724-0003/' label: security@apache.org - url: 'https://usn.ubuntu.com/4448-1/' label: security@apache.org - url: 'https://usn.ubuntu.com/4596-1/' label: security@apache.org - url: 'https://www.debian.org/security/2020/dsa-4727' label: security@apache.org - url: 'https://www.oracle.com//security-alerts/cpujul2021.html' label: security@apache.org - url: 'https://www.oracle.com/security-alerts/cpuApr2021.html' label: security@apache.org - url: 'https://www.oracle.com/security-alerts/cpuapr2022.html' label: security@apache.org - url: 'https://www.oracle.com/security-alerts/cpujan2021.html' label: security@apache.org - url: 'https://www.oracle.com/security-alerts/cpujan2022.html' label: security@apache.org - url: 'https://www.oracle.com/security-alerts/cpuoct2020.html' label: security@apache.org - url: 'https://www.oracle.com/security-alerts/cpuoct2021.html' label: security@apache.org - url: 'http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00084.html' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00088.html' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://kc.mcafee.com/corporate/index?page=content&id=SB10332' label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://lists.apache.org/thread.html/r4e5d3c09f4dd2923191e972408b40fb8b42dbff0bc7904d44b651e50%40%3Cusers.tomcat.apache.org%3E label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://lists.apache.org/thread.html/rd48c72bd3255bda87564d4da3791517c074d94f8a701f93b85752651%40%3Cannounce.tomcat.apache.org%3E label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://lists.debian.org/debian-lts-announce/2020/07/msg00017.html' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://security.netapp.com/advisory/ntap-20200724-0003/' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://usn.ubuntu.com/4448-1/' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://usn.ubuntu.com/4596-1/' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://www.debian.org/security/2020/dsa-4727' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://www.oracle.com//security-alerts/cpujul2021.html' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://www.oracle.com/security-alerts/cpuApr2021.html' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://www.oracle.com/security-alerts/cpuapr2022.html' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://www.oracle.com/security-alerts/cpujan2021.html' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://www.oracle.com/security-alerts/cpujan2022.html' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://www.oracle.com/security-alerts/cpuoct2020.html' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://www.oracle.com/security-alerts/cpuoct2021.html' label: af854a3a-2127-422b-91ae-364da2661108 tags: - nvd - exploit-available epss: 0.86608 epssPercentile: 0.99734 ingestedAt: '2026-08-25T17:29:30.225Z' exploits: github: 2 githubRepos: - 'https://github.com/RedTeamPentesting/CVE-2020-13935' - 'https://github.com/aabbcc19191/CVE-2020-13935' checkedAt: '2026-09-26T09:05:25.809Z' exploitAvailable: true --- ## Overview 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 - `tomcat >= 7.0.27, <= 7.0.104` - `tomcat >= 8.5.0, <= 8.5.56` - `tomcat >= 9.0.1, <= 9.0.36` - `tomcat = 9.0.0` - `tomcat = 10.0.0` - `debian_linux = 9.0` - `debian_linux = 10.0` - `oncommand_system_manager >= 3.0.0, <= 3.1.3` - `leap = 15.1` - `leap = 15.2` - `ubuntu_linux = 16.04` - `ubuntu_linux = 20.04` - `epolicy_orchestrator = 5.9.0` - `epolicy_orchestrator = 5.9.1` - `epolicy_orchestrator = 5.10.0` - `agile_engineering_data_management = 6.2.1.0` - `agile_product_lifecycle_management = 9.3.3` - `agile_product_lifecycle_management = 9.3.5` - `agile_product_lifecycle_management = 9.3.6` - `blockchain_platform < 21.1.2` - `commerce_guided_search = 11.3.2` - `communications_cloud_native_core_policy = 1.14.0` - `communications_instant_messaging_server = 10.0.1.5.0` - `fmw_platform = 12.2.1.3.0` - `fmw_platform = 12.2.1.4.0` - `instantis_enterprisetrack = 17.1` - `instantis_enterprisetrack = 17.2` - `instantis_enterprisetrack = 17.3` - `managed_file_transfer = 12.2.1.3.0` - `managed_file_transfer = 12.2.1.4.0` - `mysql_enterprise_monitor <= 8.0.21` - `siebel_ui_framework <= 20.12` - `workload_manager = 12.2.0.1` - `workload_manager = 18c` - `workload_manager = 19c` ## Remediation Upgrade past the affected range: - `blockchain_platform 21.1.2`