CVE-2020-9490
HighApache HTTP Server versions 2.4.20 to 2.4.43.
Published Apr 5, 2021 · Updated Sep 23, 2026 · Also known as ALPINE-CVE-2020-9490, BIT-apache-2020-9490, DEBIAN-CVE-2020-9490, UBUNTU-CVE-2020-9490
Key Facts
Patch immediately- CVE-2020-9490 is a high-severity vulnerability (CVSS 7.5 v3.1) affecting HTTP Server (Apache), Communications Element Manager (Oracle), Communications Session Report Manager (Oracle) and 22 more products.
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 89% probability of exploitation in the next 30 days.
- Fixed versions are available, including apache 2.4.46, HTTP Server 2.4.46, apache2 2.4.18-2ubuntu3.17.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (30-day exploit likelihood)
89%
Higher than 99.7% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
None known
Get the full CVE-2020-9490 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
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
303 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| HTTP ServerApache | >= 2.4.20 to 2.4.43 | 2.4.46 |
| Communications Element ManagerOracle | See advisory | 8.2.2 |
| Communications Session Report ManagerOracle | See advisory | 8.2.2 |
| Communications Session Route ManagerOracle | See advisory | 8.2.2 |
| Enterprise Manager Ops CenterOracle | 12.4.0.0 | n/a |
Patched Releases
apache
2.4.46
HTTP Server
2.4.46
apache2
2.4.18-2ubuntu3.17, 2.4.23-29.63.1, 2.4.29-1ubuntu4.14, 2.4.33-3.33.1, 2.4.33-3.41.1, 2.4.33-lp151.8.15.1, 2.4.33-lp151.8.21.1, 2.4.38-3+deb10u4, 2.4.41-4ubuntu3.1, 2.4.43-3.5.1, 2.4.43-lp152.2.3.1, 2.4.46-1, 2.4.46-r0
apache2-devel
2.4.23-29.63.1, 2.4.33-3.33.1, 2.4.33-3.41.1, 2.4.33-lp151.8.15.1, 2.4.33-lp151.8.21.1, 2.4.43-3.5.1, 2.4.43-lp152.2.3.1
apache2-doc
2.4.23-29.63.1, 2.4.33-3.33.1, 2.4.33-3.41.1, 2.4.33-lp151.8.15.1, 2.4.33-lp151.8.21.1, 2.4.43-3.5.1, 2.4.43-lp152.2.3.1
apache2-event
2.4.33-lp151.8.15.1, 2.4.33-lp151.8.21.1, 2.4.43-lp152.2.3.1
apache2-example-pages
2.4.23-29.63.1, 2.4.33-lp151.8.15.1, 2.4.33-lp151.8.21.1, 2.4.43-lp152.2.3.1
apache2-prefork
2.4.23-29.63.1, 2.4.33-3.33.1, 2.4.33-3.41.1, 2.4.33-lp151.8.15.1, 2.4.33-lp151.8.21.1, 2.4.43-3.5.1, 2.4.43-lp152.2.3.1
apache2-utils
2.4.23-29.63.1, 2.4.33-3.33.1, 2.4.33-3.41.1, 2.4.33-lp151.8.15.1, 2.4.33-lp151.8.21.1, 2.4.43-3.5.1, 2.4.43-lp152.2.3.1
apache2-worker
2.4.23-29.63.1, 2.4.33-3.33.1, 2.4.33-3.41.1, 2.4.33-lp151.8.15.1, 2.4.33-lp151.8.21.1, 2.4.43-3.5.1, 2.4.43-lp152.2.3.1
httpd
2.4.37-21.0.1.module+el8.2.0+5576+c083ffcb, 2.4.46-1.amzn2, 2.4.46-1.ph2, 2.4.46-5, NA
httpd-devel
2.4.37-21.0.1.module+el8.2.0+5576+c083ffcb, 2.4.46-1.amzn2
httpd-filesystem
2.4.37-21.0.1.module+el8.2.0+5576+c083ffcb, 2.4.46-1.amzn2
httpd-manual
2.4.37-21.0.1.module+el8.2.0+5576+c083ffcb, 2.4.46-1.amzn2
httpd-tools
2.4.37-21.0.1.module+el8.2.0+5576+c083ffcb, 2.4.46-1.amzn2
httpd:2.4
8020020200824162909.4cda2c84
httpd24
2.4.46-1.90.amzn1
httpd24-devel
2.4.46-1.90.amzn1
httpd24-httpd
0:2.4.34-18.el6.1, 0:2.4.34-18.el7.1
httpd24-manual
2.4.46-1.90.amzn1
httpd24-tools
2.4.46-1.90.amzn1
mod_http2
1.11.3-3.module+el8.2.0+7789+dac765eb.1, 1.15.14-2.amzn2
mod_ldap
2.4.37-21.0.1.module+el8.2.0+5576+c083ffcb, 2.4.46-1.amzn2
mod_md
1:2.0.8-7.module+el8.2.0+5576+c083ffcb, 2.4.46-1.amzn2
mod_proxy_html
1:2.4.37-21.0.1.module+el8.2.0+5576+c083ffcb, 1:2.4.46-1.amzn2
Timeline
Publicly disclosed
Apr 5, 2021
Last updated
Sep 23, 2026
Weakness Type
- CWE-400 Uncontrolled Resource Consumption
- CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
References
- advisoryopenSUSE-SU-2020:1285
- advisoryopenSUSE-SU-2020:1293
- advisoryopenSUSE-SU-2020:1792
- advisoryhttp://packetstormsecurity.com/files/160392/Apache-2.4.43-mod_http2-Memory-Corruption.html
- advisoryRHSA-2020:3714
FAQ
Common Questions.
Apache HTTP Server versions 2.4.20 to 2.4.43.
Affected: HTTP Server (Apache) versions >= 2.4.20 to 2.4.43; Communications Element Manager (Oracle); Communications Session Report Manager (Oracle), among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including apache 2.4.46, HTTP Server 2.4.46, apache2 2.4.18-2ubuntu3.17.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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