CVE-2021-44790

critical

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.

References

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

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

https://www.oracle.com/security-alerts/cpujan2022.html

https://www.oracle.com/security-alerts/cpuapr2022.html

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

https://support.apple.com/kb/HT213257

https://support.apple.com/kb/HT213256

https://support.apple.com/kb/HT213255

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

https://security.gentoo.org/glsa/202208-20

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

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/RGWILBORT67SHMSLYSQZG2NMXGCMPUZO/

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

http://www.openwall.com/lists/oss-security/2021/12/20/4

http://seclists.org/fulldisclosure/2022/May/38

http://seclists.org/fulldisclosure/2022/May/35

http://seclists.org/fulldisclosure/2022/May/33

https://support.apple.com/en-us/HT213256

https://support.apple.com/en-us/102770

https://www.tenable.com/blog/oracle-april-2022-critical-patch-update-addresses-221-cves

https://github.com/0xParth/stack-cve-cli

https://github.com/pujarishiva/network-vulnerability-scanner

https://github.com/alpaykuzu/PortScanner-CVE-Tool

https://github.com/minektur/rhel8-cve-eratta-checker

https://github.com/nuPacaChi/-CVE-2021-44790

https://github.com/ywChen-NTUST/CVE-POC

https://github.com/Live-Hack-CVE/CVE-2021-44790

http://packetstormsecurity.com/files/171631/Apache-2.4.x-Buffer-Overflow.html

http://httpd.apache.org/security/vulnerabilities_24.html

Details

Source: Mitre, NVD

Published: 2021-12-20

Updated: 2026-06-17

Risk Information

CVSS v2

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Severity: High

CVSS v3

Base Score: 9.8

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

Severity: Critical

EPSS

EPSS: 0.9684