CVE-2020-9490

HIGHEPSS 100th pctl

7.5

CVSS v3

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.

CWE-444

How to fix

Remediation Available

apache2Debian

Fixed in:2.4.46-1CVE-2020-9490

apache2Ubuntu

Fixed in:2.4.18-2ubuntu3.17USN-4458-1

Fixed in:2.4.29-1ubuntu4.14USN-4458-1

Fixed in:2.4.41-4ubuntu3.1USN-4458-1

apache2-binUbuntu

Fixed in:2.4.18-2ubuntu3.17USN-4458-1

Fixed in:2.4.29-1ubuntu4.14USN-4458-1

Fixed in:2.4.41-4ubuntu3.1USN-4458-1

libapache2-mod-proxy-uwsgiUbuntu

Fixed in:2.4.41-4ubuntu3.1USN-4458-1

httpdWindows application

Affected:2.4.20 2.4.46Fixed in:2.4.46Apache Lounge

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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

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

89.74%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

References

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	98%	KEV + Ransom	-
CVE-2023-41265	Critical	9.6	84%	KEV + Ransom	-
CVE-2023-25690	Critical	9.8	84%	-	Fix
CVE-2022-32214	Medium	6.5	81%	-	Fix
CVE-2021-33037	Medium	5.3	75%	-	Fix

Common questions

How do I fix CVE-2020-9490?

Published advisories record a fix for 5 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 89.7% 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 apache2 (Debian), apache2 (Ubuntu), apache2-bin (Ubuntu), libapache2-mod-proxy-uwsgi (Ubuntu), and 1 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 2024-11-21.