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Vulnerability Details : CVE-2021-44224

A crafted URI sent to httpd configured as a forward proxy (ProxyRequests on) can cause a crash (NULL pointer dereference) or, for configurations mixing forward and reverse proxy declarations, can allow for requests to be directed to a declared Unix Domain Socket endpoint (Server Side Request Forgery). This issue affects Apache HTTP Server 2.4.7 up to 2.4.51 (included).
Publish Date : 2021-12-20 Last Update Date : 2022-05-17
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- CVSS Scores & Vulnerability Types

CVSS Score
Confidentiality Impact None (There is no impact to the confidentiality of the system.)
Integrity Impact Partial (Modification of some system files or information is possible, but the attacker does not have control over what can be modified, or the scope of what the attacker can affect is limited.)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s)
CWE ID 476

- Related OVAL Definitions

Title Definition Id Class Family
RHSA-2022:1915: httpd:2.4 security and bug fix update (Moderate) oval:com.redhat.rhsa:def:20221915 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2021-44224

# Product Type Vendor Product Version Update Edition Language
1 Application Apache Http Server * * * * Version Details Vulnerabilities
2 OS Debian Debian Linux 10.0 * * * Version Details Vulnerabilities
3 OS Debian Debian Linux 11.0 * * * Version Details Vulnerabilities
4 OS Fedoraproject Fedora 34 * * * Version Details Vulnerabilities
5 OS Fedoraproject Fedora 35 * * * Version Details Vulnerabilities
6 OS Fedoraproject Fedora 36 * * * Version Details Vulnerabilities
7 Application Oracle Instantis Enterprisetrack 17.1 * * * Version Details Vulnerabilities
8 Application Oracle Instantis Enterprisetrack 17.2 * * * Version Details Vulnerabilities
9 Application Oracle Instantis Enterprisetrack 17.3 * * * Version Details Vulnerabilities
10 Application Tenable * * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Apache Http Server 1
Debian Debian Linux 2
Fedoraproject Fedora 3
Oracle Instantis Enterprisetrack 3
Tenable 1

- References For CVE-2021-44224 CONFIRM
FULLDISC 20220516 APPLE-SA-2022-05-16-2 macOS Monterey 12.4
FEDORA FEDORA-2022-21264ec6db
FULLDISC 20220516 APPLE-SA-2022-05-16-3 macOS Big Sur 11.6.6 CONFIRM
FULLDISC 20220516 APPLE-SA-2022-05-16-4 Security Update 2022-004 Catalina CONFIRM
FEDORA FEDORA-2022-78e3211c55
FEDORA FEDORA-2021-29a536c2ae
MLIST [oss-security] 20211220 CVE-2021-44224: Apache HTTP Server: Possible NULL dereference or SSRF in forward proxy configurations in Apache HTTP Server 2.4.51 and earlier

- Metasploit Modules Related To CVE-2021-44224

There are not any metasploit modules related to this CVE entry (Please visit for more information)

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