Is CVE-2021-44790 in the CISA KEV catalog?

No. CVE-2021-44790 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-44790?

CVE-2021-44790 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2021-44790?

CVE-2021-44790 has an EPSS score of 97.11% (100th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-44790?

Upgrade apache2 on debian 11 to 2.4.52-1~deb11u2 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2021-44790

CRITICALEPSS 100th pctl

9.8

CVSS v3

NVD

Description

A carefully crafted request body can cause a buffer overflow in the mod_lua multipart parser (r:parsebody() called from Lua scripts). The Apache httpd team is not aware of an exploit for the vulnerabilty though it might be possible to craft one. This issue affects Apache HTTP Server 2.4.51 and earlier.

CWE-787Out-of-bounds Write

How to fix

Remediation Available

apache2Debian

Fixed in:2.4.52-1~deb11u2CVE-2021-44790

Fixed in:2.4.52-1CVE-2021-44790

apache2Ubuntu

Fixed in:2.4.7-1ubuntu4.22+esm3USN-5212-2

Fixed in:2.4.18-2ubuntu3.17+esm4USN-5212-2

Fixed in:2.4.29-1ubuntu4.21USN-5212-1

Fixed in:2.4.41-4ubuntu3.9USN-5212-1

apache2-binUbuntu

Fixed in:2.4.7-1ubuntu4.22+esm3USN-5212-2

Fixed in:2.4.18-2ubuntu3.17+esm4USN-5212-2

Fixed in:2.4.29-1ubuntu4.21USN-5212-1

Fixed in:2.4.41-4ubuntu3.9USN-5212-1

httpdWindows application

Affected:2.4.52Fixed in:2.4.52Apache 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

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

97.11%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-787 (Out-of-bounds Write) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-22457	Critical	9.0	100%	KEV + Ransom	Fix
CVE-2025-0282	Critical	9.0	100%	KEV + Ransom	-
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2021-20038	Critical	9.8	100%	KEV + Ransom	-
CVE-2023-4863	High	8.8	100%	KEV	Fix
CVE-2020-16040	Medium	6.5	100%	-	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.