CVE-2020-9490
HIGHEPSS 100th pctlDescription
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.
How to fix
This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.
This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.
This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.
This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.
This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.
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Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploit Intelligence
Very high risk: more likely to be exploited than 100% of all known CVEs.
References
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.fedoraproject.org
- lists.fedoraproject.org
Related Vulnerabilities
Other CWE-444 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2022-22536 | Critical | 10.0 | 98% | KEV | - |
| CVE-2025-61884 | High | 7.5 | 96% | KEV + Ransom | - |
| CVE-2023-41265 | Critical | 9.6 | 88% | KEV + Ransom | - |
| CVE-2023-25690 | Critical | 9.8 | 85% | - | Fix |
| CVE-2022-32214 | Medium | 6.5 | 82% | - | Fix |
| CVE-2021-33037 | Medium | 5.3 | 75% | - | Fix |
Common questions
How do I fix CVE-2020-9490?
Published advisories record a fix for 18 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.
Is CVE-2020-9490 being actively exploited?
Not that we know of. CVE-2020-9490 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 88.8% is the estimated probability that it will be exploited in the next 30 days. That is higher than 100% of all scored CVEs.
How severe is CVE-2020-9490?
CVE-2020-9490 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2020-9490 affect?
Published advisories record a fix for httpd (Amazon), httpd-debuginfo (Amazon), httpd-devel (Amazon), httpd-filesystem (Amazon), and 14 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-17.