Disclosure 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 user A and user B could both see the results of user A's request.
Source-reported weakness categories
CWE-200
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
NIST National Vulnerability Database · NVD-CVE-2021-25122
Open original source · Updated Oct 08, 2026
Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.
| Vendor | Product / association | Version / bounds |
|---|---|---|
| apache | tomcat | * {"versionStartIncluding":"9.0.0","versionEndIncluding":"9.0.41"} |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 10.0.0 |
| apache | tomcat | 10.0.0 |
| apache | tomcat | 10.0.0 |
| apache | tomcat | 10.0.0 |
| apache | tomcat | 10.0.0 |
| apache | tomcat | 10.0.0 |
| apache | tomcat | 10.0.0 |
| apache | tomcat | 10.0.0 |
| apache | tomcat | 10.0.0 |
| apache | tomcat | 10.0.0 |
| apache | tomcat | 10.0.0 |
| debian | debian_linux | 9.0 |
| debian | debian_linux | 10.0 |
| oracle | agile_product_lifecycle_management | 9.3.3 |
| oracle | agile_product_lifecycle_management | 9.3.6 |
| oracle | communications_cloud_native_core_policy | 1.14.0 |
| oracle | communications_cloud_native_core_security_edge_protection_proxy | 1.6.0 |
| oracle | communications_instant_messaging_server | 10.0.1.5.0 |
| oracle | database | 12.2.0.1 |
| oracle | database | 19c |
| oracle | database | 21c |
| oracle | graph_server_and_client | * {"versionEndExcluding":"21.3.0"} |
| oracle | graph_server_and_client | 21.3.0 |
| oracle | instantis_enterprisetrack | 17.1 |
| oracle | instantis_enterprisetrack | 17.2 |
| oracle | instantis_enterprisetrack | 17.3 |
| oracle | managed_file_transfer | 12.2.1.3.0 |
| oracle | managed_file_transfer | 12.2.1.4.0 |
| oracle | mysql_enterprise_monitor | * {"versionEndIncluding":"8.0.23"} |
| oracle | siebel_ui_framework | * {"versionEndIncluding":"21.9"} |
Original records & references
- NIST NVD record
- CVE Program record
- lists.apache.org
- lists.apache.org — Mailing List, Vendor Advisory
- lists.apache.org — Mailing List, Vendor Advisory
- lists.apache.org — Mailing List, Vendor Advisory
- lists.apache.org — Mailing List, Vendor Advisory
- lists.apache.org — Mailing List, Vendor Advisory
- lists.apache.org — Mailing List, Vendor Advisory
- lists.apache.org — Mailing List, Vendor Advisory
- lists.apache.org — Mailing List, Vendor Advisory
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.debian.org — Mailing List, Third Party Advisory
- security.gentoo.org — Third Party Advisory
- security.netapp.com — Third Party Advisory
- www.debian.org — Third Party Advisory
- www.oracle.com — Patch, Third Party Advisory
- www.oracle.com — Patch, Third Party Advisory
- www.oracle.com — Patch, Third Party Advisory
- lists.apache.org
- lists.apache.org — Mailing List, Vendor Advisory
- lists.apache.org — Mailing List, Vendor Advisory
- lists.apache.org — Mailing List, Vendor Advisory
- lists.apache.org — Mailing List, Vendor Advisory
- lists.apache.org — Mailing List, Vendor Advisory
- lists.apache.org — Mailing List, Vendor Advisory
- lists.apache.org — Mailing List, Vendor Advisory
- lists.apache.org — Mailing List, Vendor Advisory
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.debian.org — Mailing List, Third Party Advisory
- security.gentoo.org — Third Party Advisory
- security.netapp.com — Third Party Advisory
- www.debian.org — Third Party Advisory
- www.oracle.com — Patch, Third Party Advisory
- www.oracle.com — Patch, Third Party Advisory
- www.oracle.com — Patch, Third Party Advisory
PUBLISHED 2021-03-01T07:15:13-05:00
MODIFIED 2026-10-08T18:17:08-04:00
INGESTED 2026-10-10T20:50:20-04:00