Vulnerability · Published Apr 4, 2024 · Assigned by apache
CVE-2023-38709Apache HTTP Server: HTTP response splitting
High 7.3
In plain English
A high-severity security flaw in Apache HTTP Server from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 3.9% (higher than 90% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.3High
Exploit odds (30 days)3.9%top 9.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC
Official description
Faulty input validation in the core of Apache allows malicious or exploitable backend/content generators to split HTTP responses. This issue affects Apache HTTP Server: through 2.4.58.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | httpd | 2.4.63-13.el10_2.4 | ALSA-2026:34109 |
| AlmaLinux:8 | httpd | 2.4.37-65.module_el8.10.0+3860+a6e26e50 | ALSA-2024:4197 |
| AlmaLinux:8 | httpd | 2.4.37-65.module_el8.10.0+4233+8b7d9181.9 | ALSA-2026:42828 |
| AlmaLinux:9 | httpd | 2.4.62-1.el9 | ALSA-2024:9306 |
| AlmaLinux:9 | httpd | 2.4.62-13.el9_8.5 | ALSA-2026:41906 |
| AlmaLinux:10 | httpd-core | 2.4.63-13.el10_2.4 | ALSA-2026:34109 |
| AlmaLinux:9 | httpd-core | 2.4.62-13.el9_8.5 | ALSA-2026:41906 |
| AlmaLinux:9 | httpd-core | 2.4.62-1.el9 | ALSA-2024:9306 |
| AlmaLinux:10 | httpd-devel | 2.4.63-13.el10_2.4 | ALSA-2026:34109 |
| AlmaLinux:8 | httpd-devel | 2.4.37-65.module_el8.10.0+4233+8b7d9181.9 | ALSA-2026:42828 |
| AlmaLinux:8 | httpd-devel | 2.4.37-65.module_el8.10.0+3860+a6e26e50 | ALSA-2024:4197 |
| AlmaLinux:9 | httpd-devel | 2.4.62-13.el9_8.5 | ALSA-2026:41906 |
| AlmaLinux:9 | httpd-devel | 2.4.62-1.el9 | ALSA-2024:9306 |
| AlmaLinux:10 | httpd-filesystem | 2.4.63-13.el10_2.4 | ALSA-2026:34109 |
| AlmaLinux:8 | httpd-filesystem | 2.4.37-65.module_el8.10.0+3860+a6e26e50 | ALSA-2024:4197 |
| AlmaLinux:9 | httpd-filesystem | 2.4.62-13.el9_8.5 | ALSA-2026:41906 |
| AlmaLinux:9 | httpd-filesystem | 2.4.62-1.el9 | ALSA-2024:9306 |
| AlmaLinux:10 | httpd-manual | 2.4.63-13.el10_2.4 | ALSA-2026:34109 |
| AlmaLinux:8 | httpd-manual | 2.4.37-65.module_el8.10.0+3860+a6e26e50 | ALSA-2024:4197 |
| AlmaLinux:8 | httpd-manual | 2.4.37-65.module_el8.10.0+4233+8b7d9181.9 | ALSA-2026:42828 |
| AlmaLinux:9 | httpd-manual | 2.4.62-1.el9 | ALSA-2024:9306 |
| AlmaLinux:9 | httpd-manual | 2.4.62-13.el9_8.5 | ALSA-2026:41906 |
| AlmaLinux:10 | httpd-tools | 2.4.63-13.el10_2.4 | ALSA-2026:34109 |
| AlmaLinux:8 | httpd-tools | 2.4.37-65.module_el8.10.0+4233+8b7d9181.9 | ALSA-2026:42828 |
| AlmaLinux:8 | httpd-tools | 2.4.37-65.module_el8.10.0+3860+a6e26e50 | ALSA-2024:4197 |
| AlmaLinux:9 | httpd-tools | 2.4.62-13.el9_8.5 | ALSA-2026:41906 |
| AlmaLinux:9 | httpd-tools | 2.4.62-1.el9 | ALSA-2024:9306 |
| AlmaLinux:8 | mod_http2 | 1.15.7-10.module_el8.10.0+3832+564e7653 | ALSA-2024:4197 |
| AlmaLinux:8 | mod_http2 | 1.15.7-10.module_el8.10.0+4233+8b7d9181.7 | ALSA-2026:42828 |
| AlmaLinux:10 | mod_ldap | 2.4.63-13.el10_2.4 | ALSA-2026:34109 |
| AlmaLinux:8 | mod_ldap | 2.4.37-65.module_el8.10.0+3860+a6e26e50 | ALSA-2024:4197 |
| AlmaLinux:8 | mod_ldap | 2.4.37-65.module_el8.10.0+4233+8b7d9181.9 | ALSA-2026:42828 |
| AlmaLinux:9 | mod_ldap | 2.4.62-13.el9_8.5 | ALSA-2026:41906 |
| AlmaLinux:9 | mod_ldap | 2.4.62-1.el9 | ALSA-2024:9306 |
| AlmaLinux:10 | mod_lua | 2.4.63-13.el10_2.4 | ALSA-2026:34109 |
| AlmaLinux:9 | mod_lua | 2.4.62-1.el9 | ALSA-2024:9306 |
| AlmaLinux:9 | mod_lua | 2.4.62-13.el9_8.5 | ALSA-2026:41906 |
| AlmaLinux:8 | mod_md | 1:2.0.8-8.module_el8.6.0+2872+fe0ff7aa | ALSA-2024:4197 |
| AlmaLinux:8 | mod_md | 1:2.0.8-8.module_el8.6.0+3031+fb177b09 | ALSA-2024:4197 |
| AlmaLinux:8 | mod_md | 1:2.0.8-8.module_el8.10.0+4088+57f011c1.2 | ALSA-2026:42828 |
| AlmaLinux:10 | mod_proxy_html | 1:2.4.63-13.el10_2.4 | ALSA-2026:34109 |
| AlmaLinux:8 | mod_proxy_html | 1:2.4.37-65.module_el8.10.0+3860+a6e26e50 | ALSA-2024:4197 |
| AlmaLinux:8 | mod_proxy_html | 1:2.4.37-65.module_el8.10.0+4233+8b7d9181.9 | ALSA-2026:42828 |
| AlmaLinux:9 | mod_proxy_html | 1:2.4.62-13.el9_8.5 | ALSA-2026:41906 |
| AlmaLinux:9 | mod_proxy_html | 1:2.4.62-1.el9 | ALSA-2024:9306 |
| AlmaLinux:10 | mod_session | 2.4.63-13.el10_2.4 | ALSA-2026:34109 |
| AlmaLinux:8 | mod_session | 2.4.37-65.module_el8.10.0+4233+8b7d9181.9 | ALSA-2026:42828 |
| AlmaLinux:8 | mod_session | 2.4.37-65.module_el8.10.0+3860+a6e26e50 | ALSA-2024:4197 |
| AlmaLinux:9 | mod_session | 2.4.62-13.el9_8.5 | ALSA-2026:41906 |
| AlmaLinux:9 | mod_session | 2.4.62-1.el9 | ALSA-2024:9306 |
| AlmaLinux:10 | mod_ssl | 1:2.4.63-13.el10_2.4 | ALSA-2026:34109 |
| AlmaLinux:8 | mod_ssl | 1:2.4.37-65.module_el8.10.0+3860+a6e26e50 | ALSA-2024:4197 |
| AlmaLinux:8 | mod_ssl | 1:2.4.37-65.module_el8.10.0+4233+8b7d9181.9 | ALSA-2026:42828 |
| AlmaLinux:9 | mod_ssl | 1:2.4.62-13.el9_8.5 | ALSA-2026:41906 |
| AlmaLinux:9 | mod_ssl | 1:2.4.62-1.el9 | ALSA-2024:9306 |
| Alpine:v3.20 | apache2 | 2.4.59-r0 | ALPINE-CVE-2023-38709 |
| Alpine:v3.21 | apache2 | 2.4.59-r0 | ALPINE-CVE-2023-38709 |
| Alpine:v3.22 | apache2 | 2.4.59-r0 | ALPINE-CVE-2023-38709 |
| Alpine:v3.23 | apache2 | 2.4.59-r0 | ALPINE-CVE-2023-38709 |
| Alpine:v3.24 | apache2 | 2.4.59-r0 | ALPINE-CVE-2023-38709 |
| Debian:12 | apache2 | 2.4.59-1~deb12u1 | DEBIAN-CVE-2023-38709 |
| Debian:12 | apache2 | 2.4.59-1~deb12u1 | DSA-5662-1 |
| Debian:13 | apache2 | 2.4.59-1 | DEBIAN-CVE-2023-38709 |
| Debian:14 | apache2 | 2.4.59-1 | DEBIAN-CVE-2023-38709 |
| Rocky Linux:8 | httpd | 0:2.4.37-65.module+el8.10.0+1830+22f0c9e0 | RLSA-2024:4197 |
| Rocky Linux:9 | httpd | 0:2.4.62-1.el9 | RLSA-2024:9306 |
| Rocky Linux:8 | mod_http2 | 0:1.15.7-10.module+el8.10.0+1775+6b057638 | RLSA-2024:4197 |
| Rocky Linux:8 | mod_md | 1:2.0.8-8.module+el8.9.0+1370+89cc8ad5 | RLSA-2024:4197 |
| Ubuntu:22.04:LTS | apache2 | 2.4.52-1ubuntu4.9 | USN-6729-1 |
| Ubuntu:22.04:LTS | apache2 | 2.4.52-1ubuntu4.9 | UBUNTU-CVE-2023-38709 |
| Ubuntu:24.04:LTS | apache2 | 2.4.58-1ubuntu8.1 | UBUNTU-CVE-2023-38709 |
| Ubuntu:24.04:LTS | apache2 | 2.4.58-1ubuntu8.1 | USN-6729-3 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache HTTP Server | 0 – through 2.4.58 |
Weakness: CWE-1284 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
References
- https://httpd.apache.org/security/vulnerabilities_24.html vendor-advisory
- https://security.netapp.com/advisory/ntap-20240415-0013/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WNV4SZAPVS43DZWNFU7XBYYOZEZMI4ZC/
- http://www.openwall.com/lists/oss-security/2024/04/04/3
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/I2N2NZEX3MR64IWSGL3QGN7KSRUGAEMF/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LX5U34KYGDYPRH3AJ6MDDCBJDWDPXNVJ/
- https://lists.debian.org/debian-lts-announce/2024/05/msg00013.html
- https://support.apple.com/kb/HT214119
- http://seclists.org/fulldisclosure/2024/Jul/18
- http://www.openwall.com/lists/oss-security/2025/07/10/2
- http://www.openwall.com/lists/oss-security/2025/07/10/3