CVE-2020-9490
HIGH · CVSS 7.5EPSS 88.8%EU EUVD
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.
Key facts
- CVSS score
- 7.5 (v3.1)
- Severity
- HIGH
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness (CWE)
- CWE-444
- EPSS score
- 88.8% (100th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2020-30299)
- Published
- August 7, 2020
- NVD last modified
- June 17, 2026
- Status
- Modified
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2020-30299 in the EU Vulnerability Database. Last updated in EUVD on August 4, 2024.
View on the EU Vulnerability DatabaseAffected products
- apache / http server
- canonical / ubuntu linux
- canonical / ubuntu linux
- canonical / ubuntu linux
- debian / debian linux
- fedoraproject / fedora
- fedoraproject / fedora
- opensuse / leap
- opensuse / leap
- oracle / communications element manager
- oracle / communications session report manager
- oracle / communications session route manager
- oracle / enterprise manager ops center
- oracle / hyperion infrastructure technology
- oracle / instantis enterprisetrack
- oracle / instantis enterprisetrack
- oracle / instantis enterprisetrack
- oracle / zfs storage appliance kit
- redhat / enterprise linux
- redhat / enterprise linux
- redhat / enterprise linux
- redhat / enterprise linux
- redhat / enterprise linux
- redhat / enterprise linux eus
- redhat / enterprise linux eus
- redhat / enterprise linux eus
- redhat / enterprise linux eus
- redhat / enterprise linux for ibm z systems
- redhat / enterprise linux for ibm z systems eus
- redhat / enterprise linux for ibm z systems eus
- redhat / enterprise linux for ibm z systems eus
- redhat / enterprise linux for ibm z systems eus
- redhat / enterprise linux for power little endian
- redhat / enterprise linux for power little endian eus
- redhat / enterprise linux for power little endian eus
- redhat / enterprise linux for power little endian eus
- redhat / enterprise linux for power little endian eus
- redhat / enterprise linux server aus
- redhat / enterprise linux server aus
- redhat / enterprise linux server aus
- redhat / enterprise linux server for power little endian update services for sap solutions
- redhat / enterprise linux server for power little endian update services for sap solutions
- redhat / enterprise linux server for power little endian update services for sap solutions
- redhat / enterprise linux server for power little endian update services for sap solutions
- redhat / enterprise linux server tus
- redhat / enterprise linux server tus
- redhat / enterprise linux server tus
- redhat / enterprise linux server update services for sap solutions
- redhat / enterprise linux server update services for sap solutions
- redhat / enterprise linux server update services for sap solutions
and 4 more…
Certified products that may be affected
26 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.
- Red Hat Enterprise Linux 8 NSS Cryptographic Module - Red Hat, Inc. - FIPS 140 5513 - active
- Red Hat Enterprise Linux 8 Kernel Cryptographic API - Red Hat, LLC - FIPS 140 5461 - active
- Red Hat Enterprise Linux 8 Kernel Cryptographic API - Red Hat, Inc. - FIPS 140 5089 - active
- Red Hat Enterprise Linux 8.6 - Red Hat, Inc. - Common Criteria CCEVS-VR-VID-11309-2024 - archived
- Red Hat Enterprise Linux 8 OpenSSL Cryptographic Module - Red Hat®, Inc. - FIPS 140 4642 - historical
See all 26 in the Security Certifications Explorer.
References
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00068.html(Mailing List, Third Party Advisory)
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00071.html(Mailing List, Third Party Advisory)
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00081.html(Mailing List, Third Party Advisory)
- http://packetstormsecurity.com/files/160392/Apache-2.4.43-mod_http2-Memory-Corruption.html(Third Party Advisory, VDB Entry)
- https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2020-9490(Vendor Advisory)
- 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://security.gentoo.org/glsa/202008-04(Third Party Advisory)
- https://security.netapp.com/advisory/ntap-20200814-0005/(Third Party Advisory)
- https://usn.ubuntu.com/4458-1/(Third Party Advisory)
- https://www.debian.org/security/2020/dsa-4757(Third Party Advisory)
- https://www.oracle.com/security-alerts/cpujan2021.html(Patch, Third Party Advisory)
- https://www.oracle.com/security-alerts/cpuoct2020.html(Patch, Third Party Advisory)
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
Query CVEs from your AI assistant
The CVE/NVD Explorer brain answers CVE questions directly inside Claude, ChatGPT, or any MCP assistant — always up to date, no setup. Add it once and stop pasting advisories into chat.
Add the CVE brain