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CVE-2021-44224

Good to know:

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Date: December 20, 2021

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).

Language: C

Severity Score

Related Resources (25)

https://support.apple.com/kb/HT213257
https://access.redhat.com/security/cve/CVE-2021-44224
https://support.apple.com/kb/HT213255
https://nvd.nist.gov/vuln/detail/CVE-2021-44224
https://support.apple.com/kb/HT213256
https://www.tenable.com/security/tns-2022-03
http://seclists.org/fulldisclosure/2022/May/38
https://www.tenable.com/security/tns-2022-01
https://www.oracle.com/security-alerts/cpujan2022.html
https://www.debian.org/security/2022/dsa-5035
http://httpd.apache.org/security/vulnerabilities_24.html
http://www.openwall.com/lists/oss-security/2021/12/20/3
http://seclists.org/fulldisclosure/2022/May/33
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BFSWOH4X77CV7AH7C4RMHUBDWKQDL4YH/
http://seclists.org/fulldisclosure/2022/May/35
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RGWILBORT67SHMSLYSQZG2NMXGCMPUZO/
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-44224
https://security.alpinelinux.org/vuln/CVE-2021-44224
https://security-tracker.debian.org/tracker/CVE-2021-44224
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/X73C35MMMZGBVPQQCH7LQZUMYZNQA5FO/
https://www.oracle.com/security-alerts/cpuapr2022.html
https://security.gentoo.org/glsa/202208-20
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/Z7H26WJ6TPKNWV3QKY4BHKUKQVUTZJTD/
https://security.netapp.com/advisory/ntap-20211224-0001/
https://www.mend.io/vulnerability-database/CVE-2021-44224

Severity Score

Weakness Type (CWE)

NULL Pointer Dereference

CWE-476

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): LOW
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): PARTIAL
Availability (A): PARTIAL
Additional information:

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