High
Security advisory
Apache HTTP Server versions 2.4.20 to 2.4.43. A specially crafted value for the 'Cache-Digest' header in a HTTP/2 request would result in a crash when the server actually tries to HTTP/2 PUSH a resource afterwards. Configuring the HTTP/2 feature via "H2Push off" will mitigate this vulnerability for unpatched servers.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2020-9490
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 05:51 UTC · Revision 1
Source evidence
Apache HTTP Server versions 2.4.20 to 2.4.43. A specially crafted value for the 'Cache-Digest' header in a HTTP/2 request would result in a crash when the server actually tries to HTTP/2 PUSH a resource afterwards. Configuring the HTTP/2 feature via "H2Push off" will mitigate this vulnerability for unpatched servers.
osv:CVE-2020-9490
Complete source record
{
"id": "6837cdeb09514d8f70f2de7b8e8def2815591462c2d105e8bb836177abd2257c",
"url": "https://osv.dev/vulnerability/CVE-2020-9490",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2020-9490",
"summary": "Apache HTTP Server versions 2.4.20 to 2.4.43. A specially crafted value for the 'Cache-Digest' header in a HTTP/2 request would result in a crash when the server actually tries to HTTP/2 PUSH a resource afterwards. Configuring the HTTP/2 feature via \"H2Push off\" will mitigate this vulnerability for unpatched servers.",
"evidence": "osv:CVE-2020-9490",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2020-9490",
"aliases": [
"BIT-apache-2020-9490",
"CVE-2020-9490"
],
"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/httpd",
"type": "GIT",
"events": [
{
"introduced": "6e65a7f3dadcade4274ae53f734d4c35188e3786"
},
{
"fixed": "8064ccc50bffe86ad464246b9bfac7d78d7dbc1f"
}
],
"database_specific": {
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{
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},
{
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}
],
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}
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}
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-9490.json"
}
}
],
"modified": "2026-10-24T10:30:33.602859890Z",
"provider": "osv",
"references": [
"https://lists.apache.org/thread.html/r06f0d87ebb6d59ed8379633f36f72f5b1f79cadfda72ede0830b42cf%40%3Ccvs.httpd.apache.org%3E",
"https://lists.apache.org/thread.html/r09bb998baee74a2c316446bd1a41ae7f8d7049d09d9ff991471e8775%40%3Ccvs.httpd.apache.org%3E",
"https://lists.apache.org/thread.html/r0b6541c5fb2f8fb383861333400add7def625bc993300300de0b4f8d%40%3Ccvs.httpd.apache.org%3E",
"https://lists.apache.org/thread.html/r3c5c3104813c1c5508b55564b66546933079250a46ce50eee90b2e36%40%3Ccvs.httpd.apache.org%3E",
"https://lists.apache.org/thread.html/r5debe8f82728a00a4a68bc904dd6c35423bdfc8d601cfb4579f38bf1%40%3Cdev.httpd.apache.org%3E",
"https://lists.apache.org/thread.html/r623de9b2b2433a87f3f3a15900419fc9c00c77b26936dfea4060f672%40%3Cdev.httpd.apache.org%3E",
"https://lists.apache.org/thread.html/r76142b8c5119df2178be7c2dba88fde552eedeec37ea993dfce68d1d%40%3Ccvs.httpd.apache.org%3E",
"https://lists.apache.org/thread.html/r97d0faab6ed8fd0d439234b16d05d77b22a07b0c4817e7b3cca419cc%40%3Ccvs.httpd.apache.org%3E",
"https://lists.apache.org/thread.html/r9e485ce5a01c9dc3d4d785a7d28aa7400ead1e81884034ff1f03cfee%40%3Ccvs.httpd.apache.org%3E",
"https://lists.apache.org/thread.html/r9e9f1a7609760f0f80562eaaec2aa3c32d525c3e0fca98b475240c71%40%3Cdev.httpd.apache.org%3E",
"https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E",
"https://lists.apache.org/thread.html/ra4da876037477c06f2677d7a1e10b5a8613000fca99c813958070fe9%40%3Ccvs.httpd.apache.org%3E",
"https://lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a%40%3Ccvs.httpd.apache.org%3E",
"https://lists.apache.org/thread.html/rdf3e5d0a5f5c3d90d6013bccc6c4d5af59cf1f8c8dea5d9a283d13ce%40%3Ccvs.httpd.apache.org%3E",
"https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E",
"https://lists.apache.org/thread.html/rfed9fea918e090383da33e393eb6c2755fccf05032bd7d6eb4737c9e%40%3Ccvs.httpd.apache.org%3E",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4NKWG2EXAQQB6LMLATKZ7KLSRGCSHVAN/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ITVFDBVM6E3JF3O7RYLRPRCH3RDRHJJY/",
"https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2020-9490",
"https://security.gentoo.org/glsa/202008-04",
"https://security.netapp.com/advisory/ntap-20200814-0005/",
"https://usn.ubuntu.com/4458-1/",
"https://www.debian.org/security/2020/dsa-4757",
"https://www.oracle.com/security-alerts/cpujan2021.html",
"https://www.oracle.com/security-alerts/cpuoct2020.html"
],
"provider_metadata": {
"unresolved_ranges": [
{
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"cpe:2.3:a:oracle:communications_element_manager:*:*:*:*:*:*:*:*"
],
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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:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*"
],
"vendor_product": "canonical:ubuntu_linux",
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},
{
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{
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{
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},
{
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},
{
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}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
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],
"vendor_product": "debian:debian_linux",
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},
{
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],
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]
},
{
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],
"vendor_product": "fedoraproject:fedora",
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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:o:redhat:enterprise_linux_for_ibm_z_systems_eus:8.4:*:*:*:*:*:*:*",
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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:o:redhat:enterprise_linux_for_power_little_endian_eus:8.4:*:*:*:*:*:*:*",
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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": [
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"cpe:2.3:o:redhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions:8.2:*:*:*:*:*:*:*",
"cpe:2.3:o:redhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions:8.4:*:*:*:*:*:*:*",
"cpe:2.3:o:redhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions:8.6:*:*:*:*:*:*:*"
],
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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:o:redhat:enterprise_linux_server_tus:8.4:*:*:*:*:*:*:*",
"cpe:2.3:o:redhat:enterprise_linux_server_tus:8.6:*:*:*:*:*:*:*"
],
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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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}
],
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]
},
{
"cpes": [
"cpe:2.3:o:redhat:enterprise_linux_server_update_services_for_sap_solutions:8.1:*:*:*:*:*:*:*",
"cpe:2.3:o:redhat:enterprise_linux_server_update_services_for_sap_solutions:8.2:*:*:*:*:*:*:*",
"cpe:2.3:o:redhat:enterprise_linux_server_update_services_for_sap_solutions:8.4:*:*:*:*:*:*:*",
"cpe:2.3:o:redhat:enterprise_linux_server_update_services_for_sap_solutions:8.6:*:*:*:*:*:*:*"
],
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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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},
{
"introduced": "8.6"
},
{
"last_affected": "8.6"
}
],
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}
]
},
{
"cpes": [
"cpe:2.3:a:redhat:openstack:16.1:*:*:*:*:*:*:*"
],
"vendor_product": "redhat:openstack",
"extracted_events": [
{
"range": [
{
"introduced": "16.1"
},
{
"last_affected": "16.1"
}
],
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}
]
},
{
"cpes": [
"cpe:2.3:a:redhat:openstack_for_ibm_power:16.1:*:*:*:*:*:*:*"
],
"vendor_product": "redhat:openstack_for_ibm_power",
"extracted_events": [
{
"range": [
{
"introduced": "16.1"
},
{
"last_affected": "16.1"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:redhat:software_collections:1.0:*:*:*:*:*:*:*"
],
"vendor_product": "redhat:software_collections",
"extracted_events": [
{
"range": [
{
"introduced": "1.0"
},
{
"last_affected": "1.0"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2020-9490",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 433326,
"published_at": "2020-08-07T16:15:12.043+00:00"
}