Is CVE-2020-11993 in the CISA KEV catalog?

No. CVE-2020-11993 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-11993?

CVE-2020-11993 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2020-11993?

CVE-2020-11993 has an EPSS score of 58.72% (99th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-11993?

Upgrade apache2 on debian 11 to 2.4.46-1 or later. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2020-11993

HIGHEPSS 99th pctl

7.5

CVSS v3

NVD

Description

Apache HTTP Server versions 2.4.20 to 2.4.43 When trace/debug was enabled for the HTTP/2 module and on certain traffic edge patterns, logging statements were made on the wrong connection, causing concurrent use of memory pools. Configuring the LogLevel of mod_http2 above "info" will mitigate this vulnerability for unpatched servers.

CWE-444

How to fix

Remediation Available

apache2Debian

Fixed in:2.4.46-1CVE-2020-11993

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 2.4.44Fixed in:2.4.44Apache Lounge

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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

58.72%probability of exploitation in 30 days

99thpercentile

Very high risk: more likely to be exploited than 99% 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-2020-9490	High	7.5	90%	-	Fix
CVE-2023-41265	Critical	9.6	85%	KEV + Ransom	-
CVE-2023-25690	Critical	9.8	84%	-	Fix
CVE-2022-32214	Medium	6.5	81%	-	Fix

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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 2025-05-01.