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Vulnerability details: VCID-ykyn-menc-kbfa
Vulnerability ID VCID-ykyn-menc-kbfa
Aliases CVE-2020-9490
Summary In 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.
Status Published
Exploitability 0.5
Weighted Severity 6.8
Risk 3.4
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-400 Uncontrolled Resource Consumption
System Score Found at
cvssv3 7.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-9490.json
epss 0.76276 https://api.first.org/data/v1/epss?cve=CVE-2020-9490
epss 0.76276 https://api.first.org/data/v1/epss?cve=CVE-2020-9490
cvssv3.1 7.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
apache_httpd important https://httpd.apache.org/security/json/CVE-2020-9490.json
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-9490.json
https://api.first.org/data/v1/epss?cve=CVE-2020-9490
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-11984
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-11993
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-1927
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-1934
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9490
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
1866560 https://bugzilla.redhat.com/show_bug.cgi?id=1866560
CVE-2020-9490 https://httpd.apache.org/security/json/CVE-2020-9490.json
GLSA-202008-04 https://security.gentoo.org/glsa/202008-04
RHSA-2020:3714 https://access.redhat.com/errata/RHSA-2020:3714
RHSA-2020:3726 https://access.redhat.com/errata/RHSA-2020:3726
RHSA-2020:3733 https://access.redhat.com/errata/RHSA-2020:3733
RHSA-2020:3734 https://access.redhat.com/errata/RHSA-2020:3734
USN-4458-1 https://usn.ubuntu.com/4458-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-9490.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.98948
EPSS Score 0.76276
Published At June 4, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-02T04:53:49.691170+00:00 Apache HTTPD Importer Import https://httpd.apache.org/security/json/CVE-2020-9490.json 38.6.0