{"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","slug":"CVE-2021-25122","body":"## Overview\n\nWhen 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.\n\n## Affected\n\n- `tomcat >= 8.5.0, <= 8.5.61`\n- `tomcat >= 9.0.0, <= 9.0.41`\n- `tomcat = 9.0.0`\n- `tomcat = 10.0.0`\n- `debian_linux = 9.0`\n- `debian_linux = 10.0`\n- `agile_product_lifecycle_management = 9.3.3`\n- `agile_product_lifecycle_management = 9.3.6`\n- `communications_cloud_native_core_policy = 1.14.0`\n- `communications_cloud_native_core_security_edge_protection_proxy = 1.6.0`\n- `communications_instant_messaging_server = 10.0.1.5.0`\n- `database = 12.2.0.1`\n- `database = 19c`\n- `database = 21c`\n- `graph_server_and_client < 21.3.0`\n- `graph_server_and_client = 21.3.0`\n- `instantis_enterprisetrack = 17.1`\n- `instantis_enterprisetrack = 17.2`\n- `instantis_enterprisetrack = 17.3`\n- `managed_file_transfer = 12.2.1.3.0`\n- `managed_file_transfer = 12.2.1.4.0`\n- `mysql_enterprise_monitor <= 8.0.23`\n- `siebel_ui_framework <= 21.9`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `graph_server_and_client 21.3.0`","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":41.3,"likelihood":3.6,"exploitation":0,"ransomware":0},"changes":[]}