High
Security advisory
The fix for bug 63362 present in Apache Tomcat 10.1.0-M1 to 10.1.0-M5, 10.0.0-M1 to 10.0.11, 9.0.40 to 9.0.53 and 8.5.60 to 8.5.71 introduced a memory leak. The object introduced to collect metrics for HTTP upgrade connections was not released for WebSocket connections once the connection was closed. This created a memory leak that, over time, could lead to a denial of service via an OutOfMemoryError.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-42340
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 07:16 UTC · Revision 1
Source evidence
The fix for bug 63362 present in Apache Tomcat 10.1.0-M1 to 10.1.0-M5, 10.0.0-M1 to 10.0.11, 9.0.40 to 9.0.53 and 8.5.60 to 8.5.71 introduced a memory leak. The object introduced to collect metrics for HTTP upgrade connections was not released for WebSocket connections once the connection was closed. This created a memory leak that, over time, could lead to a denial of service via an OutOfMemoryError.
osv:CVE-2021-42340
Complete source record
{
"id": "f4d66f4b9ae54a15c7ae1987f630fb3369a6f0f698650053f9a50f2e7232d79e",
"url": "https://osv.dev/vulnerability/CVE-2021-42340",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-42340",
"summary": "The fix for bug 63362 present in Apache Tomcat 10.1.0-M1 to 10.1.0-M5, 10.0.0-M1 to 10.0.11, 9.0.40 to 9.0.53 and 8.5.60 to 8.5.71 introduced a memory leak. The object introduced to collect metrics for HTTP upgrade connections was not released for WebSocket connections once the connection was closed. This created a memory leak that, over time, could lead to a denial of service via an OutOfMemoryError.",
"evidence": "osv:CVE-2021-42340",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2021-42340",
"aliases": [
"BIT-tomcat-2021-42340",
"CVE-2021-42340",
"GHSA-wph7-x527-w3h5"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/apache/tomcat",
"type": "GIT",
"events": [
{
"introduced": "04d663d7541a013098db3a3f81b1c23c255c12a4"
},
{
"fixed": "53c394049af76032bc7acab9de023013ad4fdc43"
},
{
"introduced": "11cce490eb67a8aca64377a22c0cea2e38896725"
},
{
"fixed": "454f804f3336ec980e84eb84bb6a051e349c6d3a"
},
{
"introduced": "e4344b6bd67359e1690312674d83710a793f1d5b"
},
{
"fixed": "84e18583f461778707f7fd2e25b1f0677e44e899"
},
{
"introduced": "9826be4c8368c94eab1e804b456867ca1cb766c3"
},
{
"last_affected": "2a10c8d9110d7b1c7f526f3352648c6b19ba2c52"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "8.5.60"
},
{
"fixed": "8.5.72"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "9.0.40"
},
{
"fixed": "9.0.54"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "10.0.1"
},
{
"fixed": "10.0.12"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:apache:tomcat:10.0.0:milestone10:*:*:*:*:*:*",
"range": [
{
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},
{
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}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:apache:tomcat:10.1.0:milestone1:*:*:*:*:*:*",
"range": [
{
"introduced": "10.1.0-milestone1"
},
{
"last_affected": "10.1.0-milestone1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:apache:tomcat:10.1.0:milestone2:*:*:*:*:*:*",
"range": [
{
"introduced": "10.1.0-milestone2"
},
{
"last_affected": "10.1.0-milestone2"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:apache:tomcat:10.1.0:milestone3:*:*:*:*:*:*",
"range": [
{
"introduced": "10.1.0-milestone3"
},
{
"last_affected": "10.1.0-milestone3"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:apache:tomcat:10.1.0:milestone4:*:*:*:*:*:*",
"range": [
{
"introduced": "10.1.0-milestone4"
},
{
"last_affected": "10.1.0-milestone4"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:apache:tomcat:10.1.0:milestone5:*:*:*:*:*:*",
"range": [
{
"introduced": "10.1.0-milestone5"
},
{
"last_affected": "10.1.0-milestone5"
}
],
"source": "CPE_STRING"
}
]
}
}
],
"versions": [
"10.0.0-milestone10",
"10.1.0-milestone1",
"10.1.0-milestone2",
"10.1.0-milestone3",
"10.1.0-milestone4",
"10.1.0-milestone5"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-42340.json"
}
}
],
"modified": "2026-10-24T10:30:51.113869279Z",
"provider": "osv",
"references": [
"https://lists.apache.org/thread.html/r8097a2d1550aa78e585fc77e602b9046e6d4099d8d132497c5387784%40%3Ccommits.myfaces.apache.org%3E",
"https://kc.mcafee.com/corporate/index?page=content&id=SB10379",
"https://lists.apache.org/thread.html/r83a35be60f06aca2065f188ee542b9099695d57ced2e70e0885f905c%40%3Cannounce.tomcat.apache.org%3E",
"https://security.gentoo.org/glsa/202208-34",
"https://security.netapp.com/advisory/ntap-20211104-0001/",
"https://www.debian.org/security/2021/dsa-5009",
"https://www.oracle.com/security-alerts/cpuapr2022.html",
"https://www.oracle.com/security-alerts/cpujan2022.html",
"https://www.oracle.com/security-alerts/cpujul2022.html"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:a:oracle:big_data_spatial_and_graph:*:*:*:*:*:*:*:*"
],
"vendor_product": "oracle:big_data_spatial_and_graph",
"extracted_events": [
{
"range": [
{
"fixed": "23.1"
}
],
"source": "CPE_RANGE"
}
]
},
{
"cpes": [
"cpe:2.3:a:oracle:communications_diameter_signaling_router:*:*:*:*:*:*:*:*"
],
"vendor_product": "oracle:communications_diameter_signaling_router",
"extracted_events": [
{
"range": [
{
"introduced": "8.0.0.0"
},
{
"last_affected": "8.5.0.2"
}
],
"source": "CPE_RANGE"
}
]
},
{
"cpes": [
"cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*"
],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
"range": [
{
"introduced": "11.0"
},
{
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}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:oracle:agile_engineering_data_management:6.2.1.0:*:*:*:*:*:*:*"
],
"vendor_product": "oracle:agile_engineering_data_management",
"extracted_events": [
{
"range": [
{
"introduced": "6.2.1.0"
},
{
"last_affected": "6.2.1.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:oracle:hospitality_cruise_shipboard_property_management_system:20.1.0:*:*:*:*:*:*:*"
],
"vendor_product": "oracle:hospitality_cruise_shipboard_property_management_system",
"extracted_events": [
{
"range": [
{
"introduced": "20.1.0"
},
{
"last_affected": "20.1.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:oracle:managed_file_transfer:12.2.1.3.0:*:*:*:*:*:*:*",
"cpe:2.3:a:oracle:managed_file_transfer:12.2.1.4.0:*:*:*:*:*:*:*"
],
"vendor_product": "oracle:managed_file_transfer",
"extracted_events": [
{
"range": [
{
"introduced": "12.2.1.3.0"
},
{
"last_affected": "12.2.1.3.0"
},
{
"introduced": "12.2.1.4.0"
},
{
"last_affected": "12.2.1.4.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:oracle:middleware_common_libraries_and_tools:12.2.1.4.0:*:*:*:*:*:*:*"
],
"vendor_product": "oracle:middleware_common_libraries_and_tools",
"extracted_events": [
{
"range": [
{
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{
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}
],
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}
]
},
{
"cpes": [
"cpe:2.3:a:oracle:payment_interface:19.1:*:*:*:*:*:*:*",
"cpe:2.3:a:oracle:payment_interface:20.3:*:*:*:*:*:*:*"
],
"vendor_product": "oracle:payment_interface",
"extracted_events": [
{
"range": [
{
"introduced": "19.1"
},
{
"last_affected": "19.1"
},
{
"introduced": "20.3"
},
{
"last_affected": "20.3"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:oracle:retail_customer_insights:15.0.2:*:*:*:*:*:*:*",
"cpe:2.3:a:oracle:retail_customer_insights:16.0.2:*:*:*:*:*:*:*"
],
"vendor_product": "oracle:retail_customer_insights",
"extracted_events": [
{
"range": [
{
"introduced": "15.0.2"
},
{
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{
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{
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],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
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"cpe:2.3:a:oracle:retail_data_extractor_for_merchandising:16.0.2:*:*:*:*:*:*:*"
],
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"extracted_events": [
{
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{
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{
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{
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{
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}
],
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}
]
},
{
"cpes": [
"cpe:2.3:a:oracle:retail_eftlink:21.0.0:*:*:*:*:*:*:*"
],
"vendor_product": "oracle:retail_eftlink",
"extracted_events": [
{
"range": [
{
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{
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],
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]
},
{
"cpes": [
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]
},
{
"cpes": [
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"cpe:2.3:a:oracle:retail_store_inventory_management:14.1.3.14:*:*:*:*:*:*:*",
"cpe:2.3:a:oracle:retail_store_inventory_management:14.1.3.5:*:*:*:*:*:*:*",
"cpe:2.3:a:oracle:retail_store_inventory_management:15.0.3.3:*:*:*:*:*:*:*",
"cpe:2.3:a:oracle:retail_store_inventory_management:15.0.3.8:*:*:*:*:*:*:*",
"cpe:2.3:a:oracle:retail_store_inventory_management:16.0.3.7:*:*:*:*:*:*:*"
],
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"extracted_events": [
{
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{
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{
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},
{
"introduced": "14.1.3.5"
},
{
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},
{
"introduced": "14.1.3.14"
},
{
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},
{
"introduced": "15.0.3.3"
},
{
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{
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{
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},
{
"introduced": "16.0.3.7"
},
{
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]
},
{
"cpes": [
"cpe:2.3:a:oracle:sd-wan_edge:9.0:*:*:*:*:*:*:*",
"cpe:2.3:a:oracle:sd-wan_edge:9.1:*:*:*:*:*:*:*"
],
"vendor_product": "oracle:sd-wan_edge",
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{
"range": [
{
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},
{
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},
{
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},
{
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}
],
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}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2021-42340",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 437413,
"published_at": "2021-10-14T20:15:09.06+00:00"
}