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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server | Apache HTTP Server 2.4 – ≤ 2.4.51 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | apache2 | 2.4.52-1 | — |
| Debian 13 | apache2 | 2.4.52-1 | — |
| Debian 12 | apache2 | 2.4.52-1 | — |
| Debian 11 | apache2 | 2.4.52-1~deb11u2 | DSA-5035-1 |
| Debian 10 | apache2 | 2.4.38-3+deb10u7 | DSA-5035-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 9 | apache2 | 2.4.25-3+deb9u12 | DLA-2907-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | apache2 | 2.4.52-1ubuntu1 | — |
| Ubuntu 20.04 LTS | apache2 | 2.4.41-4ubuntu3.9 | USN-5212-1 |
| Ubuntu 18.04 LTS | apache2 | 2.4.29-1ubuntu4.21 | USN-5212-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | apache2 | 2.4.18-2ubuntu3.17+esm4 | USN-5212-2 |
| Ubuntu Pro 14.04 LTS | apache2 | 2.4.7-1ubuntu4.22+esm3 | USN-5212-2 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | httpd +6 | 2.4.37-43.module+el8.5.0+13806+b30d9eec.1 | RHSA-2022:0258 |
| RHEL 8 | mod_http2 | 1.15.7-3.module+el8.4.0+8625+d397f3da | RHSA-2022:0258 |
| RHEL 8 | mod_md | 1:2.0.8-8.module+el8.3.0+6814+67d1e611 | RHSA-2022:0258 |
| RHEL 8 | mod_ssl +1 | 1:2.4.37-43.module+el8.5.0+13806+b30d9eec.1 | RHSA-2022:0258 |
| RHEL 7 | httpd +5 | 2.4.6-97.el7_9.4 | RHSA-2022:0143 |
| RHEL 7 | mod_ssl +1 | 1:2.4.6-97.el7_9.4 | RHSA-2022:0143 |
| RHEL 3 | httpd24-httpd +5 | 2.4.34-23.el7.1 | RHSA-2022:0303 |
| RHEL 3 | httpd24-mod_ssl +1 | 1:2.4.34-23.el7.1 | RHSA-2022:0303 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8.4 EUS | httpd +6 | 2.4.37-39.module+el8.4.0+13807+c8c001ae.3 | RHSA-2022:0258 |
| RHEL 8.4 EUS | mod_http2 | 1.15.7-3.module+el8.4.0+8625+d397f3da | RHSA-2022:0258 |
| RHEL 8.4 EUS | mod_md | 1:2.0.8-8.module+el8.3.0+6814+67d1e611 | RHSA-2022:0258 |
| RHEL 8.4 EUS | mod_ssl +1 | 1:2.4.37-39.module+el8.4.0+13807+c8c001ae.3 | RHSA-2022:0258 |
| RHEL 8.2 EUS | httpd +6 | 2.4.37-21.module+el8.2.0+13808+dea277df.3 | RHSA-2022:0258 |
| RHEL 8.2 EUS | mod_http2 | 1.11.3-3.module+el8.2.0+7758+84b4ca3e.1 | RHSA-2022:0258 |
| RHEL 8.2 EUS | mod_md | 1:2.0.8-7.module+el8.2.0+5531+7e4d69a2 | RHSA-2022:0258 |
| RHEL 8.2 EUS | mod_ssl +1 | 1:2.4.37-21.module+el8.2.0+13808+dea277df.3 | RHSA-2022:0258 |
| RHEL 8.1 E4S | httpd +7 | 2.4.37-16.module+el8.1.0+13809+822d170a.3 | RHSA-2022:0288 |
| RHEL 8.1 E4S | mod_http2 | 1.11.3-3.module+el8.1.0+7763+babdfe5b.1 | RHSA-2022:0288 |
| RHEL 8.1 E4S | mod_ssl +1 | 1:2.4.37-16.module+el8.1.0+13809+822d170a.3 | RHSA-2022:0288 |
| RHEL 7.7 TUS | httpd +5 | 2.4.6-90.el7_7.3 | RHSA-2022:1137 |
| RHEL 7.7 TUS | mod_ssl +1 | 1:2.4.6-90.el7_7.3 | RHSA-2022:1137 |
| RHEL 7.7 E4S | httpd +5 | 2.4.6-90.el7_7.3 | RHSA-2022:1137 |
| RHEL 7.7 E4S | mod_ssl +1 | 1:2.4.6-90.el7_7.3 | RHSA-2022:1137 |
| RHEL 7.7 AUS | httpd +5 | 2.4.6-90.el7_7.3 | RHSA-2022:1137 |
| RHEL 7.7 AUS | mod_ssl +1 | 1:2.4.6-90.el7_7.3 | RHSA-2022:1137 |
| RHEL 7.6 TUS | httpd +5 | 2.4.6-89.el7_6.4 | RHSA-2022:1136 |
| RHEL 7.6 TUS | mod_ssl +1 | 1:2.4.6-89.el7_6.4 | RHSA-2022:1136 |
| RHEL 7.6 E4S | httpd +5 | 2.4.6-89.el7_6.4 | RHSA-2022:1136 |
| RHEL 7.6 E4S | mod_ssl +1 | 1:2.4.6-89.el7_6.4 | RHSA-2022:1136 |
| RHEL 7.6 AUS | httpd +5 | 2.4.6-89.el7_6.4 | RHSA-2022:1136 |
| RHEL 7.6 AUS | mod_ssl +1 | 1:2.4.6-89.el7_6.4 | RHSA-2022:1136 |
| RHEL 7.4 AUS | httpd +5 | 2.4.6-67.el7_4.9 | RHSA-2022:1138 |
| RHEL 7.4 AUS | mod_ssl +1 | 1:2.4.6-67.el7_4.9 | RHSA-2022:1138 |
| RHEL 7.3 AUS | httpd +5 | 2.4.6-45.el7_3.8 | RHSA-2022:1139 |
| RHEL 7.3 AUS | mod_ssl +1 | 1:2.4.6-45.el7_3.8 | RHSA-2022:1139 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | httpd +6 | 2.4.37-43.module_el8.5.0+2609+b30d9eec.1.alma | ALSA-2022:0258 |
| AlmaLinux 8 | mod_http2 | 1.15.7-3.module_el8.5.0+2609+b30d9eec | ALSA-2022:0258 |
| AlmaLinux 8 | mod_md | 1:2.0.8-8.module_el8.5.0+2609+b30d9eec | ALSA-2022:0258 |
| AlmaLinux 8 | mod_ssl +1 | 1:2.4.37-43.module_el8.5.0+2609+b30d9eec.1.alma | ALSA-2022:0258 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | httpd | 2.4.37-39.module+el8.4.0+571+fd70afb1 | RLSA-2022:0258 |
| Rocky Linux 8 | mod_http2 | 1.15.7-3.module+el8.4.0+553+7a69454b | RLSA-2022:0258 |
| Rocky Linux 8 | mod_md | 1:2.0.8-8.module+el8.4.0+553+7a69454b | RLSA-2022:0258 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | apache2 | 2.4.66-150400.6.57.1 | SUSE-SU-2026:2686-1 |
| SLES 15 SP4 | apache2 | 2.4.66-150400.6.57.1 | SUSE-SU-2026:2686-1 |
| SLES 15 SP3 | apache2 | 2.4.51-3.37.1 | SUSE-SU-2022:0091-1 |
| SLES 15 SP2 | apache2 | 2.4.51-3.37.1 | SUSE-SU-2022:0091-2, SUSE-SU-2022:0091-1 |
| SLES 15 SP1 | apache2 | 2.4.33-3.61.1 | SUSE-SU-2022:0119-1 |
Show 23 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 | apache2 | 2.4.33-3.61.1 | SUSE-SU-2022:0119-1 |
| SLES 12 SP5 | apache2 | 2.4.51-35.7.1 | SUSE-SU-2022:0440-1 |
| SLES 12 SP4 | apache2 | 2.4.23-29.83.1 | SUSE-SU-2022:0065-1 |
| SLES 12 SP3 | apache2 | 2.4.23-29.83.1 | SUSE-SU-2022:0065-1 |
| SLES 12 SP2 | apache2 | 2.4.23-29.83.1 | SUSE-SU-2022:0065-1 |
| SLES for SAP 15 SP5 | apache2 | 2.4.66-150400.6.57.1 | SUSE-SU-2026:2686-1 |
| SLES for SAP 15 SP4 | apache2 | 2.4.66-150400.6.57.1 | SUSE-SU-2026:2686-1 |
| SLES for SAP 15 SP1 | apache2 | 2.4.33-3.61.1 | SUSE-SU-2022:0119-1 |
| SLES for SAP 15 | apache2 | 2.4.33-3.61.1 | SUSE-SU-2022:0119-1 |
| SLES for SAP 12 SP5 | apache2 | 2.4.51-35.7.1 | SUSE-SU-2022:0440-1 |
| SLES for SAP 12 SP4 | apache2 | 2.4.23-29.83.1 | SUSE-SU-2022:0065-1 |
| SLES for SAP 12 SP3 | apache2 | 2.4.23-29.83.1 | SUSE-SU-2022:0065-1 |
| SLE HPC 15 SP5 | apache2 | 2.4.66-150400.6.57.1 | SUSE-SU-2026:2686-1 |
| SLE HPC 15 SP4 | apache2 | 2.4.66-150400.6.57.1 | SUSE-SU-2026:2686-1 |
| SLE HPC 15 SP1 | apache2 | 2.4.33-3.61.1 | SUSE-SU-2022:0119-1 |
| SLE HPC 15 | apache2 | 2.4.33-3.61.1 | SUSE-SU-2022:0119-1 |
| SUSE Package Hub 15 SP3 | chromium | 99.0.4844.84-bp153.2.75.1 | openSUSE-SU-2022:0091-1 |
| SUSE OpenStack Cloud Crowbar 9 | apache2 | 2.4.23-29.83.1 | SUSE-SU-2022:0065-1 |
| SUSE OpenStack Cloud Crowbar 8 | apache2 | 2.4.23-29.83.1 | SUSE-SU-2022:0065-1 |
| SUSE OpenStack Cloud 9 | apache2 | 2.4.23-29.83.1 | SUSE-SU-2022:0065-1 |
| SUSE OpenStack Cloud 8 | apache2 | 2.4.23-29.83.1 | SUSE-SU-2022:0065-1 |
| SUSE HPE Helion OpenStack 8 | apache2 | 2.4.23-29.83.1 | SUSE-SU-2022:0065-1 |
| SUSE Enterprise Storage 6 | apache2 | 2.4.33-3.61.1 | SUSE-SU-2022:0119-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | apache2 | 2.4.52-1.1 | openSUSE-SU-2024:11695-1 |
| openSUSE Leap 15.3 | apache2 | 2.4.51-3.37.1 | openSUSE-SU-2022:0091-1 |
| openSUSE Leap 15.3 | chromium | 99.0.4844.84-bp153.2.75.1 | openSUSE-SU-2022:0091-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | apache2 | 2.4.52-r0 | — |
| Alpine v3.23 | apache2 | 2.4.52-r0 | — |
| Alpine v3.22 | apache2 | 2.4.52-r0 | — |
| Alpine v3.21 | apache2 | 2.4.52-r0 | — |
| Alpine v3.20 | apache2 | 2.4.52-r0 | — |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | apache2 | 2.4.52-r0 | — |
| Alpine v3.18 | apache2 | 2.4.52-r0 | — |
| Alpine v3.17 | apache2 | 2.4.52-r0 | — |
| Alpine v3.16 | apache2 | 2.4.52-r0 | — |
| Alpine v3.15 | apache2 | 2.4.52-r0 | — |
| Alpine v3.14 | apache2 | 2.4.52-r0 | — |
| Alpine v3.13 | apache2 | 2.4.52-r0 | — |
| Alpine v3.12 | apache2 | 2.4.52-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | httpd +8 | 2.4.54-3.amzn2023.0.4 | ALAS2023-2023-072 |
| Amazon Linux 2023 | mod_ssl +1 | 1:2.4.54-3.amzn2023.0.4 | ALAS2023-2023-072 |
| Amazon Linux 2 | httpd +7 | 2.4.52-1.amzn2 | ALAS2-2022-1737 |
| Amazon Linux 2 | mod_ssl +1 | 1:2.4.52-1.amzn2 | ALAS2-2022-1737 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | httpd | 2.4.52-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | httpd +6 | 2.4.37-43.0.1.module+el8.5.0+20475+4f6a8fd5.1 | ELSA-2022-0258 |
| Oracle Linux 8 | mod_http2 | 1.15.7-3.module+el8.4.0+20024+b87b2deb | ELSA-2022-0258 |
| Oracle Linux 8 | mod_md | 1:2.0.8-8.module+el8.5.0+20475+4f6a8fd5 | ELSA-2022-0258 |
| Oracle Linux 8 | mod_ssl +1 | 1:2.4.37-43.0.1.module+el8.5.0+20475+4f6a8fd5.1 | ELSA-2022-0258 |
| Oracle Linux 7 | httpd +5 | 2.4.6-97.0.5.el7_9.4 | ELSA-2022-0143 |
| Oracle Linux 7 | mod_ssl +1 | 1:2.4.6-97.0.5.el7_9.4 | ELSA-2022-0143 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Exploit-DB 1
- Apache 2.4.x - Buffer Overflow EDB-51193 · webapps · Apr 1, 2023 · verified
GitHub 3 repositories
-
nuPacaChi/-CVE-2021-44790 ★ 4 · Dec 5, 2023
Thực nghiệm CVE-2021-44790
-
CerberusMrXi/Apache-Lua-Buffer-Overflow-Exploit-CVE-2021-44790 ★ 1 · Aug 4, 2026
Apache HTTP Server 2.4.x mod_lua Buffer Overflow (CVE-2021-44790) - Advanced exploitation framework with fingerprinting, multi-stage scanning, plugin architecture, professional reporting, screenshot …
-
MohammadAliMehri/cve-2021-44790-lab ★ 0 · Sep 19, 2026
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 33
- ALSA-2022:0258 Important: httpd:2.4 security update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2022-0432 Xerox FreeFlow Print Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 11, 2026
- WID-SEC-2022-0302 Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen Ausführen von beliebigem Programmcode mit Administratorrechten BSI CERT-Bund (WID) · Oct 11, 2026
- RHSA-2022:1139 Red Hat Security Advisory: httpd security update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- RHSA-2022:1137 Red Hat Security Advisory: httpd security update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- RHSA-2022:1138 Red Hat Security Advisory: httpd security update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- RHSA-2022:1136 Red Hat Security Advisory: httpd security update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- RHSA-2022:0143 Red Hat Security Advisory: httpd security update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- RHSA-2022:0303 Red Hat Security Advisory: httpd24-httpd security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2022:0288 Red Hat Security Advisory: httpd:2.4 security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2022:0258 Red Hat Security Advisory: httpd:2.4 security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- SUSE-SU-2026:2686-1 Security update for apache2 SUSE / openSUSE Security Updates · Jul 1, 2026
- WID-SEC-2022-0727 Apache HTTP Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 30, 2026
- USN-5212-2 apache2 vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- USN-5212-1 apache2 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-5035-1 apache2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2907-1 apache2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2022:0258 Important: httpd:2.4 security update Rocky Linux Security Advisories · Feb 4, 2026
- SUSE-SU-2022:0440-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0065-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0091-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0091-2 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11695-1 apache2-2.4.52-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0119-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2022:0091-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2024-0064 Juniper Produkte: Mehrere Schwachstellen BSI CERT-Bund (WID) · Apr 10, 2025
- WID-SEC-2024-1591 Juniper JUNOS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 11, 2024
- WID-SEC-2022-1057 Apple macOS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 21, 2023
- ALAS2023-2023-072 Important: httpd security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Feb 22, 2023
- ICSA-22-132-02 Mitsubishi Electric MELSOFT iQ AppPortal CISA ICS & IT advisories · May 12, 2022
- ELSA-2022-0258 Important: httpd:2.4 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jan 25, 2022
- ALAS2-2022-1737 Important: httpd security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jan 20, 2022
- ELSA-2022-0143 Important: httpd security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jan 18, 2022
References
- http://httpd.apache.org/security/vulnerabilities_24.html
- [oss-security] 20211220 CVE-2021-44790: Apache HTTP Server: Possible buffer overflow when parsing multipart content in mod_lua of Apache HTTP Server 2.4.51 and earlier mailing-list
- FEDORA-2021-29a536c2ae vendor-advisory
- DSA-5035 vendor-advisory
- https://www.oracle.com/security-alerts/cpujan2022.html
- https://security.netapp.com/advisory/ntap-20211224-0001/
- https://www.tenable.com/security/tns-2022-01
- https://www.tenable.com/security/tns-2022-03
- FEDORA-2022-b4103753e9 vendor-advisory
- FEDORA-2022-21264ec6db vendor-advisory
- FEDORA-2022-78e3211c55 vendor-advisory
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://support.apple.com/kb/HT213257
- https://support.apple.com/kb/HT213256
- https://support.apple.com/kb/HT213255
- 20220516 APPLE-SA-2022-05-16-4 Security Update 2022-004 Catalina mailing-list
- 20220516 APPLE-SA-2022-05-16-3 macOS Big Sur 11.6.6 mailing-list
- 20220516 APPLE-SA-2022-05-16-2 macOS Monterey 12.4 mailing-list
- GLSA-202208-20 vendor-advisory
- http://packetstormsecurity.com/files/171631/Apache-2.4.x-Buffer-Overflow.html