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High 7.5Published Mar 1, 2021
CVE-2021-25122Apache Tomcat h2c request mix-up
Updated under an hour ago ()
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It affects Apache Software Foundation Apache Tomcat and 12 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Weakness (CWE)
- CWE-200
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- apache
- NVD analysis
- Modified
- Record last updated
- Oct 8, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Apache Software Foundation Apache Tomcat apache_software_foundation:apache_tomcat (from the name) | from Apache Tomcat 10 before 10.0.2; from Apache Tomcat 9 before 9.0.42; from Apache Tomcat 8.5 before 8.5.62 | CNA record |
apache tomcat apache:tomcat | from 8.5.0 through 8.5.61; from 9.0.0 through 9.0.41; 9.0.0; 9.0.0; 9.0.0; 9.0.0; 9.0.0; 9.0.0; and 28 more ranges | NVD |
debian debian_linux debian:debian_linux | 9.0; 10.0 | NVD |
oracle agile_product_lifecycle_management oracle:agile_product_lifecycle_management | 9.3.3; 9.3.6 | NVD |
oracle communications_cloud_native_core_policy oracle:communications_cloud_native_core_policy | 1.14.0 | NVD |
oracle communications_cloud_native_core_security_edge_protection_proxy oracle:communications_cloud_native_core_security_edge_protection_proxy | 1.6.0 | NVD |
oracle communications_instant_messaging_server oracle:communications_instant_messaging_server | 10.0.1.5.0 | NVD |
oracle database oracle:database | 12.2.0.1; 19c; 21c | NVD |
oracle graph_server_and_client oracle:graph_server_and_client | before 21.3.0; 21.3.0 | NVD |
oracle instantis_enterprisetrack oracle:instantis_enterprisetrack | 17.1; 17.2; 17.3 | NVD |
oracle managed_file_transfer oracle:managed_file_transfer | 12.2.1.3.0; 12.2.1.4.0 | NVD |
oracle mysql_enterprise_monitor oracle:mysql_enterprise_monitor | through 8.0.23 | NVD |
oracle siebel_ui_framework oracle:siebel_ui_framework | through 21.9 | NVD |
References
- https://lists.apache.org/thread.html/r7b95bc248603360501f18c8eb03bb6001ec0ee3296205b34b07105b7%40%3Cannounce.tomcat.apache.org%3Ex-refsource-misc
- https://lists.apache.org/thread.html/r7b95bc248603360501f18c8eb03bb6001ec0ee3296205b34b07105b7%40%3Cusers.tomcat.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/r7b95bc248603360501f18c8eb03bb6001ec0ee3296205b34b07105b7%40%3Cdev.tomcat.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/rf6d5d57b114678d8898005faef31e9fd6d7c981fcc4ccfc3bc272fc9%40%3Cdev.tomcat.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/r7b95bc248603360501f18c8eb03bb6001ec0ee3296205b34b07105b7%40%3Cannounce.apache.org%3Emailing-list, x-refsource-mlist
- http://www.openwall.com/lists/oss-security/2021/03/01/1mailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/rcd90bf36b1877e1310b87ecd14ed7bbb15da52b297efd9f0e7253a3b%40%3Cusers.tomcat.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/rd0463f9a5cbc02a485404c4b990f0da452e5ac5c237808edba11c947%40%3Cusers.tomcat.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.debian.org/debian-lts-announce/2021/03/msg00018.htmlmailing-list, x-refsource-mlist
- https://www.debian.org/security/2021/dsa-4891vendor-advisory, x-refsource-debian
- https://www.oracle.com//security-alerts/cpujul2021.htmlx-refsource-misc
- https://security.netapp.com/advisory/ntap-20210409-0002/x-refsource-confirm
- https://www.oracle.com/security-alerts/cpuoct2021.htmlx-refsource-misc
- https://www.oracle.com/security-alerts/cpujan2022.htmlx-refsource-misc
- https://security.gentoo.org/glsa/202208-34vendor-advisory, x-refsource-gentoo
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.