High
Security advisory
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-25122
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 07:35 UTC · Revision 1
Source evidence
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.
osv:CVE-2021-25122
Complete source record
{
"id": "5ae2f9c27d03d0c91ccbbc75892caed488f411c8e8fe23d7162e486ba8f3bf5a",
"url": "https://osv.dev/vulnerability/CVE-2021-25122",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-25122",
"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.",
"evidence": "osv:CVE-2021-25122",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2021-25122",
"aliases": [
"BIT-tomcat-2021-25122",
"CVE-2021-25122",
"GHSA-j39c-c8hj-x4j3"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
}
],
"affected": [
{
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"type": "GIT",
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{
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{
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"9.0.0-milestone3",
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-25122.json"
}
}
],
"modified": "2026-10-24T10:30:55.420225731Z",
"provider": "osv",
"references": [
"https://lists.apache.org/thread.html/r7b95bc248603360501f18c8eb03bb6001ec0ee3296205b34b07105b7%40%3Cannounce.apache.org%3E",
"https://lists.apache.org/thread.html/r7b95bc248603360501f18c8eb03bb6001ec0ee3296205b34b07105b7%40%3Cdev.tomcat.apache.org%3E",
"https://lists.apache.org/thread.html/r7b95bc248603360501f18c8eb03bb6001ec0ee3296205b34b07105b7%40%3Cusers.tomcat.apache.org%3E",
"https://lists.apache.org/thread.html/rcd90bf36b1877e1310b87ecd14ed7bbb15da52b297efd9f0e7253a3b%40%3Cusers.tomcat.apache.org%3E",
"https://lists.apache.org/thread.html/rd0463f9a5cbc02a485404c4b990f0da452e5ac5c237808edba11c947%40%3Cusers.tomcat.apache.org%3E",
"https://lists.apache.org/thread.html/rf6d5d57b114678d8898005faef31e9fd6d7c981fcc4ccfc3bc272fc9%40%3Cdev.tomcat.apache.org%3E",
"https://lists.apache.org/thread.html/r7b95bc248603360501f18c8eb03bb6001ec0ee3296205b34b07105b7%40%3Cannounce.tomcat.apache.org%3E",
"https://lists.debian.org/debian-lts-announce/2021/03/msg00018.html",
"https://security.gentoo.org/glsa/202208-34",
"https://security.netapp.com/advisory/ntap-20210409-0002/",
"https://www.debian.org/security/2021/dsa-4891",
"https://www.oracle.com//security-alerts/cpujul2021.html",
"https://www.oracle.com/security-alerts/cpujan2022.html",
"https://www.oracle.com/security-alerts/cpuoct2021.html"
],
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},
{
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],
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]
},
{
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],
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{
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},
{
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},
{
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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:instantis_enterprisetrack:17.1:*:*:*:*:*:*:*",
"cpe:2.3:a:oracle:instantis_enterprisetrack:17.2:*:*:*:*:*:*:*",
"cpe:2.3:a:oracle:instantis_enterprisetrack:17.3:*:*:*:*:*:*:*"
],
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{
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},
{
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},
{
"introduced": "17.2"
},
{
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},
{
"introduced": "17.3"
},
{
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}
],
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}
]
},
{
"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"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2021-25122",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 438412,
"published_at": "2021-03-01T12:15:13.793+00:00"
}