--- id: CVE-2021-25122 title: >- When responding to new h2c connection requests, Apache Tomcat versions 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41 and 8.5.0 to 8.5.61 could duplicate request headers and a limited amount of request body from one request to another meaning u… summary: >- When responding to new h2c connection requests, Apache Tomcat versions 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41 and 8.5.0 to 8.5.61 could duplicate request headers and a limited amount of request body from one request to another meaning u… severity: high cvss: 7.5 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N' cwe: - CWE-200 - CWE-200 vendor: apache product: tomcat affected: - 'tomcat >= 8.5.0, <= 8.5.61' - 'tomcat >= 9.0.0, <= 9.0.41' - tomcat = 9.0.0 - tomcat = 10.0.0 - debian_linux = 9.0 - debian_linux = 10.0 - agile_product_lifecycle_management = 9.3.3 - agile_product_lifecycle_management = 9.3.6 - communications_cloud_native_core_policy = 1.14.0 - communications_cloud_native_core_security_edge_protection_proxy = 1.6.0 - communications_instant_messaging_server = 10.0.1.5.0 - database = 12.2.0.1 - database = 19c - database = 21c - graph_server_and_client < 21.3.0 - graph_server_and_client = 21.3.0 - 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 <= 8.0.23 - siebel_ui_framework <= 21.9 patched: - graph_server_and_client 21.3.0 published: '2021-03-01' updated: '2026-08-25' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-25122' references: - url: 'http://www.openwall.com/lists/oss-security/2021/03/01/1' label: security@apache.org - url: >- https://lists.apache.org/thread.html/r7b95bc248603360501f18c8eb03bb6001ec0ee3296205b34b07105b7%40%3Cannounce.apache.org%3E label: security@apache.org - url: >- https://lists.apache.org/thread.html/r7b95bc248603360501f18c8eb03bb6001ec0ee3296205b34b07105b7%40%3Cannounce.tomcat.apache.org%3E label: security@apache.org - url: >- https://lists.apache.org/thread.html/r7b95bc248603360501f18c8eb03bb6001ec0ee3296205b34b07105b7%40%3Cannounce.tomcat.apache.org%3E label: security@apache.org - url: >- https://lists.apache.org/thread.html/r7b95bc248603360501f18c8eb03bb6001ec0ee3296205b34b07105b7%40%3Cannounce.tomcat.apache.org%3E label: security@apache.org - url: >- https://lists.apache.org/thread.html/r7b95bc248603360501f18c8eb03bb6001ec0ee3296205b34b07105b7%40%3Cannounce.tomcat.apache.org%3E label: security@apache.org - url: >- https://lists.apache.org/thread.html/r7b95bc248603360501f18c8eb03bb6001ec0ee3296205b34b07105b7%40%3Cdev.tomcat.apache.org%3E label: security@apache.org - url: >- https://lists.apache.org/thread.html/r7b95bc248603360501f18c8eb03bb6001ec0ee3296205b34b07105b7%40%3Cusers.tomcat.apache.org%3E label: security@apache.org - url: >- https://lists.apache.org/thread.html/rcd90bf36b1877e1310b87ecd14ed7bbb15da52b297efd9f0e7253a3b%40%3Cusers.tomcat.apache.org%3E label: security@apache.org - url: >- https://lists.apache.org/thread.html/rd0463f9a5cbc02a485404c4b990f0da452e5ac5c237808edba11c947%40%3Cusers.tomcat.apache.org%3E label: security@apache.org - url: >- https://lists.apache.org/thread.html/rf6d5d57b114678d8898005faef31e9fd6d7c981fcc4ccfc3bc272fc9%40%3Cdev.tomcat.apache.org%3E label: security@apache.org - url: 'https://lists.debian.org/debian-lts-announce/2021/03/msg00018.html' label: security@apache.org - url: 'https://security.gentoo.org/glsa/202208-34' label: security@apache.org - url: 'https://security.netapp.com/advisory/ntap-20210409-0002/' label: security@apache.org - url: 'https://www.debian.org/security/2021/dsa-4891' label: security@apache.org - url: 'https://www.oracle.com//security-alerts/cpujul2021.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/cpuoct2021.html' label: security@apache.org - url: 'http://www.openwall.com/lists/oss-security/2021/03/01/1' label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://lists.apache.org/thread.html/r7b95bc248603360501f18c8eb03bb6001ec0ee3296205b34b07105b7%40%3Cannounce.apache.org%3E label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://lists.apache.org/thread.html/r7b95bc248603360501f18c8eb03bb6001ec0ee3296205b34b07105b7%40%3Cannounce.tomcat.apache.org%3E label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://lists.apache.org/thread.html/r7b95bc248603360501f18c8eb03bb6001ec0ee3296205b34b07105b7%40%3Cannounce.tomcat.apache.org%3E label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://lists.apache.org/thread.html/r7b95bc248603360501f18c8eb03bb6001ec0ee3296205b34b07105b7%40%3Cannounce.tomcat.apache.org%3E label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://lists.apache.org/thread.html/r7b95bc248603360501f18c8eb03bb6001ec0ee3296205b34b07105b7%40%3Cannounce.tomcat.apache.org%3E label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://lists.apache.org/thread.html/r7b95bc248603360501f18c8eb03bb6001ec0ee3296205b34b07105b7%40%3Cdev.tomcat.apache.org%3E label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://lists.apache.org/thread.html/r7b95bc248603360501f18c8eb03bb6001ec0ee3296205b34b07105b7%40%3Cusers.tomcat.apache.org%3E label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://lists.apache.org/thread.html/rcd90bf36b1877e1310b87ecd14ed7bbb15da52b297efd9f0e7253a3b%40%3Cusers.tomcat.apache.org%3E label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://lists.apache.org/thread.html/rd0463f9a5cbc02a485404c4b990f0da452e5ac5c237808edba11c947%40%3Cusers.tomcat.apache.org%3E label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://lists.apache.org/thread.html/rf6d5d57b114678d8898005faef31e9fd6d7c981fcc4ccfc3bc272fc9%40%3Cdev.tomcat.apache.org%3E label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://lists.debian.org/debian-lts-announce/2021/03/msg00018.html' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://security.gentoo.org/glsa/202208-34' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://security.netapp.com/advisory/ntap-20210409-0002/' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://www.debian.org/security/2021/dsa-4891' 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/cpujan2022.html' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://www.oracle.com/security-alerts/cpuoct2021.html' label: af854a3a-2127-422b-91ae-364da2661108 tags: - nvd epss: 0.18114 epssPercentile: 0.971 ingestedAt: '2026-08-25T17:29:31.132Z' --- ## Overview When responding to new h2c connection requests, Apache Tomcat versions 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41 and 8.5.0 to 8.5.61 could duplicate request headers and a limited amount of request body from one request to another meaning user A and user B could both see the results of user A's request. ## Affected - `tomcat >= 8.5.0, <= 8.5.61` - `tomcat >= 9.0.0, <= 9.0.41` - `tomcat = 9.0.0` - `tomcat = 10.0.0` - `debian_linux = 9.0` - `debian_linux = 10.0` - `agile_product_lifecycle_management = 9.3.3` - `agile_product_lifecycle_management = 9.3.6` - `communications_cloud_native_core_policy = 1.14.0` - `communications_cloud_native_core_security_edge_protection_proxy = 1.6.0` - `communications_instant_messaging_server = 10.0.1.5.0` - `database = 12.2.0.1` - `database = 19c` - `database = 21c` - `graph_server_and_client < 21.3.0` - `graph_server_and_client = 21.3.0` - `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 <= 8.0.23` - `siebel_ui_framework <= 21.9` ## Remediation Upgrade past the affected range: - `graph_server_and_client 21.3.0`