High
Security advisory
An h2c direct connection to Apache Tomcat 10.0.0-M1 to 10.0.0-M6, 9.0.0.M5 to 9.0.36 and 8.5.1 to 8.5.56 did not release the HTTP/1.1 processor after the upgrade to HTTP/2. If a sufficient number of such requests were made, an OutOfMemoryException could occur leading to a denial of service.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2020-13934
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 06:26 UTC · Revision 1
Source evidence
An h2c direct connection to Apache Tomcat 10.0.0-M1 to 10.0.0-M6, 9.0.0.M5 to 9.0.36 and 8.5.1 to 8.5.56 did not release the HTTP/1.1 processor after the upgrade to HTTP/2. If a sufficient number of such requests were made, an OutOfMemoryException could occur leading to a denial of service.
osv:CVE-2020-13934
Complete source record
{
"id": "294d3e7a6c4b8f49a06beec1220f04087cb106ca1dc7d4b60c349e232ad23948",
"url": "https://osv.dev/vulnerability/CVE-2020-13934",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2020-13934",
"summary": "An h2c direct connection to Apache Tomcat 10.0.0-M1 to 10.0.0-M6, 9.0.0.M5 to 9.0.36 and 8.5.1 to 8.5.56 did not release the HTTP/1.1 processor after the upgrade to HTTP/2. If a sufficient number of such requests were made, an OutOfMemoryException could occur leading to a denial of service.",
"evidence": "osv:CVE-2020-13934",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2020-13934",
"aliases": [
"BIT-tomcat-2020-13934",
"CVE-2020-13934",
"GHSA-vf77-8h7g-gghp"
],
"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": [
{
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{
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{
"cpe": "cpe:2.3:a:apache:tomcat:9.0.0:milestone21:*:*:*:*:*:*",
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"cpe": "cpe:2.3:a:apache:tomcat:9.0.0:milestone22:*:*:*:*:*:*",
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{
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{
"cpe": "cpe:2.3:a:apache:tomcat:9.0.0:milestone26:*:*:*:*:*:*",
"range": [
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{
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],
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{
"cpe": "cpe:2.3:a:apache:tomcat:9.0.0:milestone27:*:*:*:*:*:*",
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{
"cpe": "cpe:2.3:a:apache:tomcat:9.0.0:milestone5:*:*:*:*:*:*",
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{
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{
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{
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{
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{
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"9.0.0-milestone25",
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"9.0.0-milestone6",
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],
"database_specific": {
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}
],
"modified": "2026-10-24T10:30:39.480094996Z",
"provider": "osv",
"references": [
"https://lists.apache.org/thread.html/ra072b1f786e7d139e86f1d1145572e0ff71cef38a96d9c6f5362aac8%40%3Cdev.tomcat.apache.org%3E",
"https://lists.apache.org/thread.html/r61f411cf82488d6ec213063fc15feeeb88e31b0ca9c29652ee4f962e%40%3Cannounce.tomcat.apache.org%3E",
"https://lists.debian.org/debian-lts-announce/2020/07/msg00017.html",
"https://security.netapp.com/advisory/ntap-20200724-0003/",
"https://usn.ubuntu.com/4596-1/",
"https://www.debian.org/security/2020/dsa-4727",
"https://www.oracle.com//security-alerts/cpujul2021.html",
"https://www.oracle.com/security-alerts/cpuApr2021.html",
"https://www.oracle.com/security-alerts/cpujan2021.html",
"https://www.oracle.com/security-alerts/cpujan2022.html",
"https://www.oracle.com/security-alerts/cpuoct2020.html"
],
"provider_metadata": {
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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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],
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{
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],
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{
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}
],
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]
},
{
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"cpe:2.3:a:oracle:instantis_enterprisetrack:17.3:*:*:*:*:*:*:*"
],
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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": [
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"cpe:2.3:a:oracle:managed_file_transfer:12.2.1.4.0:*:*:*:*:*:*:*"
],
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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:workload_manager:12.2.0.1:*:*:*:*:*:*:*",
"cpe:2.3:a:oracle:workload_manager:18c:*:*:*:*:*:*:*",
"cpe:2.3:a:oracle:workload_manager:19c:*:*:*:*:*:*:*"
],
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{
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{
"introduced": "12.2.0.1"
},
{
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},
{
"introduced": "18c"
},
{
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},
{
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},
{
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}
],
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}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2020-13934",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 434682,
"published_at": "2020-07-14T15:15:11.007+00:00"
}