CVE-2021-44224

Home/CVE/A crafted URI sent to httpd configured as a forward proxy (ProxyRequests on) can cause a crash (NULL pointer dereference

CVE

A crafted URI sent to httpd configured as a forward proxy (ProxyRequests on) can cause a crash (NULL pointer dereference

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).

HIGH · CVSS 8.2 EPSS 0.0925

Schedule remediation

EPSS percentile: top 7% of all CVEs by exploitation likelihood
CVSS base score ≥ 7.0

Sigma rules8 YARA rules0

⬡

Weakness Classification

CWE-476NULL Pointer Dereference

▤

Affected Products & Versions

apache http server>= 2.4.7 and < 2.4.52
fedoraproject fedoraall versions
debian linuxall versions
tenable tenable.sc>= 5.14.0 and < 5.20.0
tenable tenable.sc>= 5.16.0 and < 202201.1
oracle communications element manager< 9.0
oracle communications operations monitorall versions
oracle communications session report manager< 9.0
Show all 15 affected productsoracle communications session route manager< 9.0
oracle http serverall versions
oracle instantis enterprisetrackall versions
apple mac os xall versions
apple macos< 10.15.7
apple macos>= 11.0 and < 11.6.6
apple macos>= 12.0.0 and < 12.4

◈

Sigma Hunt Rules

Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.

producthighSuspicious Microsoft Office Child Process - MacOS

producthighRemote Access Tool - Renamed MeshAgent Execution - MacOS

producthighBinary Padding - MacOS

productmediumSuspicious Execution via macOS Script Editor

productmediumSystem Information Discovery Via Sysctl - MacOS

productmediumNew File Exclusion Added To Time Machine Via Tmutil - MacOS

Show all 8 top matches

productmediumSuspicious MacOS Firmware Activity

productmediumDisk Image Mounting Via Hdiutil - MacOS

▣

Scoring & Timeline

8.2

HIGH · CVSS v3.1 · security@apache.org

View on NVD

Attack Vector

Network Adjacent Local Physical

Attack Complexity

Low High

Privileges Required

None Low High

User Interaction

None Required

Scope

Unchanged Changed

Confidentiality

None Low High

Integrity

None Low High

Availability

None Low High

Published to NVD20 Dec 2021 · 12:15 PM

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

⚑

Vendor Advisories

suse-csafopenSUSE-SU-2024:11695-1
rhsaRHSA-2022:6753Moderate
rhsaRHSA-2022:7144Moderate
suse-csafSUSE-SU-2022:0440-1
suse-csafSUSE-SU-2022:0091-2
Show all 15 vendor advisoriessuse-csafSUSE-SU-2022:0119-1
suse-csafopenSUSE-SU-2022:0091-1
suse-csafSUSE-SU-2022:0091-1
suse-csafSUSE-SU-2022:0065-1
usnUSN-5212-2
usnUSN-5212-1
msrcCVE-2021-44224
rhsaRHSA-2022:1915Moderate
rhsaRHSA-2022:7143Moderate
oracle-cpuoracle-cpu-Enterprise-Manager-Ops-Center-9835--CVE-2021-44224

🔗

References & Sources

Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.

http://httpd.apache.org/security/vulnerabilities_24.htmlVendor Advisory

http://seclists.org/fulldisclosure/2022/May/33Mailing ListThird Party Advisory

http://seclists.org/fulldisclosure/2022/May/35Mailing ListThird Party Advisory

http://seclists.org/fulldisclosure/2022/May/38Mailing ListThird Party Advisory

http://www.openwall.com/lists/oss-security/2021/12/20/3Mailing ListThird Party Advisory

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BFSWOH4X77CV7AH7C4RMHUBDWKQDL4YH/

Show all 19 references

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RGWILBORT67SHMSLYSQZG2NMXGCMPUZO/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X73C35MMMZGBVPQQCH7LQZUMYZNQA5FO/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z7H26WJ6TPKNWV3QKY4BHKUKQVUTZJTD/

https://security.gentoo.org/glsa/202208-20Third Party Advisory

https://security.netapp.com/advisory/ntap-20211224-0001/Third Party Advisory

https://support.apple.com/kb/HT213255Third Party Advisory

https://support.apple.com/kb/HT213256Third Party Advisory

https://support.apple.com/kb/HT213257Third Party Advisory

https://www.debian.org/security/2022/dsa-5035Third Party Advisory

https://www.oracle.com/security-alerts/cpuapr2022.htmlPatchThird Party Advisory

https://www.oracle.com/security-alerts/cpujan2022.htmlPatchThird Party Advisory

https://www.tenable.com/security/tns-2022-01Third Party Advisory

https://www.tenable.com/security/tns-2022-03Third Party Advisory

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