What’s Vulnerable › Vulnerabilities
CVE-2020-9490
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 88.8% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2020-08-07 · updated 2026-06-17
- Weakness: CWE-444
Description
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.
Affected products
- Apache HTTP Server: from 2.4.20 before 2.4.46 — fixed in 2.4.46
- Canonical Ubuntu Linux: 16.04, 18.04, 20.04
- Debian Linux: 10.0
- Fedoraproject Fedora: 31, 32
- openSUSE Leap: 15.1, 15.2
- Oracle Communications Element Manager: from 8.2.0 through 8.2.2
- Oracle Communications Session Report Manager: from 8.2.0 through 8.2.2
- Oracle Communications Session Route Manager: from 8.2.0 through 8.2.2
- Oracle Corporation Enterprise Manager Ops Center: 12.4.0.0
- Oracle Corporation Oracle Hyperion Infrastructure Technology: 11.1.2.4
- Oracle Instantis Enterprisetrack: 17.1, 17.2, 17.3
- Oracle Corporation Oracle ZFS Storage Appliance Kit: 8.8
- Red Hat Enterprise Linux: 8.0
- RedHat Enterprise Linux Eus: 8.1, 8.2, 8.4, 8.6
- RedHat Enterprise Linux For Ibm Z Systems: 8.0
- RedHat Enterprise Linux For Ibm Z Systems Eus: 8.1, 8.2, 8.4, 8.6
- RedHat Enterprise Linux For Power Little Endian: 8.0
- RedHat Enterprise Linux For Power Little Endian Eus: 8.1, 8.2, 8.4, 8.6
- RedHat Enterprise Linux Server Aus: 8.2, 8.4, 8.6
- RedHat Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions: 8.1, 8.2, 8.4, 8.6
- RedHat Enterprise Linux Server Tus: 8.2, 8.4, 8.6
- RedHat Enterprise Linux Server Update Services For Sap Solutions: 8.1, 8.2, 8.4, 8.6
- OpenStack: 16.1
- RedHat Openstack For Ibm Power: 16.1
- RedHat Software Collections: 1.0
How to fix
Upgrade to a fixed version: Apache HTTP Server 2.4.46. Check the vendor advisory for mitigations.
References
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00068.html
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00071.html
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00081.html
- http://packetstormsecurity.com/files/160392/Apache-2.4.43-mod_http2-Memory-Corruption.html
- https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2020-9490
- 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
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