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Fencer Vulns
high 7.5

CVE-2020-9490 in the critical feed json

Apache HTTP Server versions 2.4.20 to 2.4.43.

published 2020-08-07 6 y ago modified 2026-09-08 2 mo ago also BIT-apache-2020-9490 , EUVD-2020-30299

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
88.8%
EPSS 88.8% chance of exploitation in 30 days, percentile 99.7%
public exploits
0
none known

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.

Patch / fix

  • bitnami apache 2.4.46
  • apache http_server 2.4.46
  • apache2 Debian 14, Debian 13, Debian 12 2.4.46-1

debian advisories DEBIAN-CVE-2020-9490

  • apache2 Ubuntu 18.04 LTS 2.4.29-1ubuntu4.14
  • apache2 Ubuntu 20.04 LTS 2.4.41-4ubuntu3.1

ubuntu advisories UBUNTU-CVE-2020-9490

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • httpd RHEL 8 2.4.37-21.module+el8.2.0+5008+cca404a3
  • mod_md RHEL 8 1:2.0.8-7.module+el8.2.0+5531+7e4d69a2
  • mod_ssl RHEL 8 1:2.4.37-21.module+el8.2.0+5008+cca404a3
  • mod_ldap RHEL 8 2.4.37-21.module+el8.2.0+5008+cca404a3
  • mod_http2 RHEL 8 1.11.3-3.module+el8.2.0+7758+84b4ca3e.1
  • httpd-tools RHEL 8 2.4.37-21.module+el8.2.0+5008+cca404a3
  • mod_session RHEL 8 2.4.37-21.module+el8.2.0+5008+cca404a3
  • httpd-manual RHEL 8 2.4.37-21.module+el8.2.0+5008+cca404a3

red hat advisories RHSA-2020:3726RHSA-2020:3714RHSA-2020:3734RHSA-2020:3733

  • apache2 SLES for SAP 15, SLES 15-LTSS, SLE Module for Server Applications 15 SP1 +2 more 2.4.33-3.41.1
  • apache2 SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +15 more 2.4.23-29.63.1
  • apache2 SLES for SAP 15, SLES 15-LTSS, SLE Module for Server Applications 15 SP1 +2 more 2.4.33-3.33.1
  • apache2 SLE Module for Server Applications 15 SP2, SLE Module for Basesystem 15 SP2 2.4.43-3.5.1

suse advisories SUSE-SU-2020:3067-1SUSE-SU-2020:2450-1SUSE-SU-2020:2344-1SUSE-SU-2020:2311-1

  • apache2 openSUSE Leap 15.1 2.4.33-lp151.8.21.1
  • apache2 openSUSE Leap 15.1 2.4.33-lp151.8.15.1
  • apache2 openSUSE Leap 15.2 2.4.43-lp152.2.3.1

opensuse advisories openSUSE-SU-2020:1792-1openSUSE-SU-2020:1293-1openSUSE-SU-2020:1285-1

  • apache2 Alpine 3.24, Alpine 3.23, Alpine 3.22 +13 more 2.4.46-r0

alpine advisories ALPINE-CVE-2020-9490

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-9490 updated cvss 7.5

httpd: Push diary crash on specifically crafted HTTP/2 header

  • Red Hat JBoss Enterprise Web Server 2 jbcs-httpd24, jbcs-httpd24-runtime
    affected: workaround, no fix planned “Configuring the HTTP/2 feature via "H2Push off" will mitigate this vulnerability.”
  • Red Hat Enterprise Linux AppStream (v. 8) mod_md 2.0.8-7.module+el8.2.0+5531+7e4d69a2, httpd 2.4.37-21.module+el8.2.0+5008+cca404a3, mod_ssl 2.4.37-21.module+el8.2.0+5008+cca404a3, mod_ldap 2.4.37-21.module+el8.2.0+5008+cca404a3, mod_http2 1.11.3-3.module+el8.2.0+7758+84b4ca3e.1, httpd-tools 2.4.37-21.module+el8.2.0+5008+cca404a3, +4 more
    fixed: vendor fix “Configuring the HTTP/2 feature via "H2Push off" will mitigate this vulnerability.” RHSA-2020:3714
  • Red Hat Enterprise Linux AppStream E4S (v. 8.0) httpd 2.4.37-12.module+el8.0.0+4096+eb40e6da, mod_md 2.4.37-12.module+el8.0.0+4096+eb40e6da, mod_ssl 2.4.37-12.module+el8.0.0+4096+eb40e6da, mod_ldap 2.4.37-12.module+el8.0.0+4096+eb40e6da, mod_http2 1.11.3-3.module+el8.0.0+7808+f6c0e84d.1, httpd-tools 2.4.37-12.module+el8.0.0+4096+eb40e6da, +4 more
    fixed: vendor fix “Configuring the HTTP/2 feature via "H2Push off" will mitigate this vulnerability.” RHSA-2020:3734
  • Red Hat Enterprise Linux AppStream EUS (v. 8.1) httpd 2.4.37-16.module+el8.1.0+4134+e6bad0ed, mod_md 2.4.37-16.module+el8.1.0+4134+e6bad0ed, mod_ssl 2.4.37-16.module+el8.1.0+4134+e6bad0ed, mod_ldap 2.4.37-16.module+el8.1.0+4134+e6bad0ed, mod_http2 1.11.3-3.module+el8.1.0+7763+babdfe5b.1, httpd-tools 2.4.37-16.module+el8.1.0+4134+e6bad0ed, +4 more
    fixed: vendor fix “Configuring the HTTP/2 feature via "H2Push off" will mitigate this vulnerability.” RHSA-2020:3726
  • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6) httpd24-httpd 2.4.34-18.el6.1, httpd24-mod_ssl 2.4.34-18.el6.1, httpd24-mod_ldap 2.4.34-18.el6.1, httpd24-httpd-tools 2.4.34-18.el6.1, httpd24-mod_session 2.4.34-18.el6.1, httpd24-httpd-manual 2.4.34-18.el6.1, +1 more Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) httpd24-httpd 2.4.34-18.el7.1, httpd24-mod_ssl 2.4.34-18.el7.1, httpd24-mod_ldap 2.4.34-18.el7.1, httpd24-httpd-tools 2.4.34-18.el7.1, httpd24-mod_session 2.4.34-18.el7.1, httpd24-httpd-manual 2.4.34-18.el7.1, +1 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6) httpd24-httpd 2.4.34-18.el7.1, httpd24-mod_ssl 2.4.34-18.el7.1, httpd24-mod_ldap 2.4.34-18.el7.1, httpd24-httpd-tools 2.4.34-18.el7.1, httpd24-mod_session 2.4.34-18.el7.1, httpd24-httpd-manual 2.4.34-18.el7.1, +1 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7) httpd24-httpd 2.4.34-18.el7.1, httpd24-mod_ssl 2.4.34-18.el7.1, httpd24-mod_ldap 2.4.34-18.el7.1, httpd24-httpd-tools 2.4.34-18.el7.1, httpd24-mod_session 2.4.34-18.el7.1, httpd24-httpd-manual 2.4.34-18.el7.1, +1 more Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6) httpd24-httpd 2.4.34-18.el6.1, httpd24-mod_ssl 2.4.34-18.el6.1, httpd24-mod_ldap 2.4.34-18.el6.1, httpd24-httpd-tools 2.4.34-18.el6.1, httpd24-mod_session 2.4.34-18.el6.1, httpd24-httpd-manual 2.4.34-18.el6.1, +1 more Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) httpd24-httpd 2.4.34-18.el7.1, httpd24-mod_ssl 2.4.34-18.el7.1, httpd24-mod_ldap 2.4.34-18.el7.1, httpd24-httpd-tools 2.4.34-18.el7.1, httpd24-mod_session 2.4.34-18.el7.1, httpd24-httpd-manual 2.4.34-18.el7.1, +1 more
    fixed: vendor fix “Configuring the HTTP/2 feature via "H2Push off" will mitigate this vulnerability.” RHSA-2020:3733
  • Red Hat Enterprise Linux 5 httpd Red Hat Enterprise Linux 6 httpd, mod_ssl, httpd-tools, httpd-manual Red Hat Enterprise Linux 7 httpd, mod_ssl, mod_ldap, httpd-tools, mod_session, httpd-manual, +1 more Red Hat JBoss Core Services jbcs-httpd24-httpd
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

88.84% chance of exploitation in the next 30 days, higher than 99.7% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
bitnami apache
>=2.4.20, <2.4.46
2.4.46

Affected products

  • n/a Apache HTTP Server

Classification

Weakness
  • CWE-444 Inconsistent Interpretation of HTTP Requests
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.