GHSA-4vww-mc66-62m6 · Severity: medium · Ecosystem: maven — HTTP Request Smuggling in Apache Tomcat
Apache Tomcat 10.0.0-M1 to 10.0.6, 9.0.0.M1 to 9.0.46 and 8.5.0 to 8.5.66 did not correctly parse the HTTP transfer-encoding request header in some circumstances leading to the possibility to request smuggling when used with a reverse proxy. Specifically: - Tomcat incorrectly ignored the transfer encoding header if the client declared it would only accept an HTTP/1.0 response; - Tomcat honoured the identify encoding; and - Tomcat did not ensure that, if present, the chunked encoding was the final encoding.
Conclusion & alert: CVE-2021-33037 is rated Moderate Risk (50.5/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.86%). Mandatory action: Review affected assets and schedule remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-05-20 | 1.72% | 1.86% | +0.14% |
| 2 | 2026-05-14 | 1.86% | 1.72% | -0.14% |
| 3 | 2026-03-04 | — | 1.86% | — |
Full EPSS history (84 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 5.3 | 3.1 | MEDIUM |
|
3.9 | 1.4 | [email protected] |
| 5.0 | 2.0 | MEDIUM |
|
10.0 | 2.9 | [email protected] |
GHSA-4vww-mc66-62m6 · Severity: medium · Ecosystem: maven — HTTP Request Smuggling in Apache Tomcat
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2021-33037 not yet assigned priority: Debian including 1 source packages (tomcat9), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2021-33037 |
gentoo
|
low | CVE-2021-33037: 1 GLSA(s) (202208-34), 1 atom(s) (www-servers/tomcat); latest impact low. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2021-33037 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2021-33037 |
suse
|
medium | CVE-2021-33037 severity moderate: SUSE including 377 source package names (5.0.0-beta1.2.122:tomcat-9.0.36-13.1, 5.0.0-beta1.2.122:tomcat-el-3_0-api-9.0.36-13.1, …), 644 product×package rows across 57 product lines (Container containers/apache-tomcat, Container suse/manager/5.0/x86_64/server, … (57 product lines)): Fixed 385, Known Affected 231, Will Not Fix 28. | https://www.suse.com/security/cve/CVE-2021-33037/ |
ubuntu
|
medium | CVE-2021-33037 medium priority: Ubuntu including 4 source packages (tomcat6, tomcat7, tomcat8, tomcat9), 64 status rows across 16 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 40, ignored 9, needed 7, not-affected 4, released 4. | https://ubuntu.com/security/CVE-2021-33037 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| apache | tomcat | >= 8.5.0, <= 8.5.66 | cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* |
| apache | tomcat | > 9.0.0, <= 9.0.46 | cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* |
| apache | tomcat | > 10.0.0, <= 10.0.6 | cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* |
| apache | tomee | 8.0.6 | cpe:2.3:a:apache:tomee:8.0.6:*:*:*:*:*:*:* |
| debian | debian_linux | 9.0 | cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* |
| debian | debian_linux | 10.0 | cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* |
| oracle | agile_plm | 9.3.6 | cpe:2.3:a:oracle:agile_plm:9.3.6:*:*:*:*:*:*:* |
| oracle | communications_cloud_native_core_policy | 1.14.0 | cpe:2.3:a:oracle:communications_cloud_native_core_policy:1.14.0:*:*:*:*:*:*:* |
| oracle | communications_cloud_native_core_service_communication_proxy | 1.14.0 | cpe:2.3:a:oracle:communications_cloud_native_core_service_communication_proxy:1.14.0:*:*:*:*:*:*:* |
| oracle | communications_diameter_signaling_router | >= 8.0.0.0, <= 8.5.0.2 | cpe:2.3:a:oracle:communications_diameter_signaling_router:*:*:*:*:*:*:*:* |
| oracle | communications_instant_messaging_server | 10.0.1.5.0 | cpe:2.3:a:oracle:communications_instant_messaging_server:10.0.1.5.0:*:*:*:*:*:*:* |
| oracle | communications_policy_management | 12.5.0 | cpe:2.3:a:oracle:communications_policy_management:12.5.0:*:*:*:*:*:*:* |
| oracle | communications_pricing_design_center | 12.0.0.3.0 | cpe:2.3:a:oracle:communications_pricing_design_center:12.0.0.3.0:*:*:*:*:*:*:* |
| oracle | communications_session_report_manager | >= 8.0.0, <= 8.2.4.0 | cpe:2.3:a:oracle:communications_session_report_manager:*:*:*:*:*:*:*:* |
| oracle | communications_session_route_manager | >= 8.0.0, <= 8.2.4 | cpe:2.3:a:oracle:communications_session_route_manager:*:*:*:*:*:*:*:* |
| oracle | graph_server_and_client | < 21.4 | cpe:2.3:a:oracle:graph_server_and_client:*:*:*:*:*:*:*:* |
| oracle | healthcare_translational_research | 4.1.0 | cpe:2.3:a:oracle:healthcare_translational_research:4.1.0:*:*:*:*:*:*:* |
| oracle | hospitality_cruise_shipboard_property_management_system | 20.1.0 | cpe:2.3:a:oracle:hospitality_cruise_shipboard_property_management_system:20.1.0:*:*:*:*:*:*:* |
| oracle | instantis_enterprisetrack | 17.1 | cpe:2.3:a:oracle:instantis_enterprisetrack:17.1:*:*:*:*:*:*:* |
| oracle | instantis_enterprisetrack | 17.2 | cpe:2.3:a:oracle:instantis_enterprisetrack:17.2:*:*:*:*:*:*:* |
| oracle | instantis_enterprisetrack | 17.3 | cpe:2.3:a:oracle:instantis_enterprisetrack:17.3:*:*:*:*:*:*:* |
| oracle | managed_file_transfer | 12.2.1.3.0 | cpe:2.3:a:oracle:managed_file_transfer:12.2.1.3.0:*:*:*:*:*:*:* |
| oracle | managed_file_transfer | 12.2.1.4.0 | cpe:2.3:a:oracle:managed_file_transfer:12.2.1.4.0:*:*:*:*:*:*:* |
| oracle | mysql_enterprise_monitor | <= 8.0.25 | cpe:2.3:a:oracle:mysql_enterprise_monitor:*:*:*:*:*:*:*:* |
| oracle | sd-wan_edge | 9.0 | cpe:2.3:a:oracle:sd-wan_edge:9.0:*:*:*:*:*:*:* |
| oracle | sd-wan_edge | 9.1 | cpe:2.3:a:oracle:sd-wan_edge:9.1:*:*:*:*:*:*:* |
| oracle | secure_global_desktop | 5.6 | cpe:2.3:a:oracle:secure_global_desktop:5.6:*:*:*:*:*:*:* |
| oracle | utilities_testing_accelerator | 6.0.0.1.1 | cpe:2.3:a:oracle:utilities_testing_accelerator:6.0.0.1.1:*:*:*:*:*:*:* |
| oracle | utilities_testing_accelerator | 6.0.0.2.2 | cpe:2.3:a:oracle:utilities_testing_accelerator:6.0.0.2.2:*:*:*:*:*:*:* |
| oracle | utilities_testing_accelerator | 6.0.0.3.1 | cpe:2.3:a:oracle:utilities_testing_accelerator:6.0.0.3.1:*:*:*:*:*:*:* |
| mcafee | epolicy_orchestrator | < 5.10.0 | cpe:2.3:a:mcafee:epolicy_orchestrator:*:*:*:*:*:*:*:* |
| mcafee | epolicy_orchestrator | 5.10.0 | cpe:2.3:a:mcafee:epolicy_orchestrator:5.10.0:-:*:*:*:*:*:* |
| mcafee | epolicy_orchestrator | 5.10.0 | cpe:2.3:a:mcafee:epolicy_orchestrator:5.10.0:update_1:*:*:*:*:*:* |
| mcafee | epolicy_orchestrator | 5.10.0 | cpe:2.3:a:mcafee:epolicy_orchestrator:5.10.0:update_10:*:*:*:*:*:* |
| mcafee | epolicy_orchestrator | 5.10.0 | cpe:2.3:a:mcafee:epolicy_orchestrator:5.10.0:update_2:*:*:*:*:*:* |
| mcafee | epolicy_orchestrator | 5.10.0 | cpe:2.3:a:mcafee:epolicy_orchestrator:5.10.0:update_3:*:*:*:*:*:* |
| mcafee | epolicy_orchestrator | 5.10.0 | cpe:2.3:a:mcafee:epolicy_orchestrator:5.10.0:update_4:*:*:*:*:*:* |
| mcafee | epolicy_orchestrator | 5.10.0 | cpe:2.3:a:mcafee:epolicy_orchestrator:5.10.0:update_5:*:*:*:*:*:* |
| mcafee | epolicy_orchestrator | 5.10.0 | cpe:2.3:a:mcafee:epolicy_orchestrator:5.10.0:update_6:*:*:*:*:*:* |
| mcafee | epolicy_orchestrator | 5.10.0 | cpe:2.3:a:mcafee:epolicy_orchestrator:5.10.0:update_7:*:*:*:*:*:* |
| mcafee | epolicy_orchestrator | 5.10.0 | cpe:2.3:a:mcafee:epolicy_orchestrator:5.10.0:update_8:*:*:*:*:*:* |
| mcafee | epolicy_orchestrator | 5.10.0 | cpe:2.3:a:mcafee:epolicy_orchestrator:5.10.0:update_9:*:*:*:*:*:* |