Insufficient escaping of user-supplied data in mod_ssl in Apache HTTP Server 2.4.63 and earlier allows an untrusted SSL/TLS client to insert escape characters into log files in some configurations.
In a logging configuration where CustomLog is used with "%{varname}x" or "%{varname}c" to log variables provided by mod_ssl such as SSL_TLS_SNI, no escaping is performed by either mod_log_config or mod_ssl and unsanitized data provided by the client may appear in log files.
CVSS Details
- CVSS 3.1 Base Score: 7.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade mod_mdUpgrade mod_http2Upgrade mod_sslUpgrade httpd-manualUpgrade mod_proxy_htmlUpgrade httpd-coreUpgrade httpd-toolsUpgrade mod_luaUpgrade httpd-filesystemUpgrade httpdUpgrade mod_sessionUpgrade mod_ldapUpgrade httpd-devel | Sep 5, 2025 | Sep 3, 2025 |
| Alpine Linux | — | Upgrade apache2 | Aug 8, 2025 | Jul 10, 2025 |
| Amazon Linux Ami 2 | — | Upgrade httpd-filesystemUpgrade httpd-develUpgrade httpd-toolsUpgrade mod_proxy_htmlUpgrade mod_mdUpgrade httpdUpgrade mod_ldapUpgrade mod_sessionUpgrade mod_sslUpgrade httpd-manualUpgrade httpd-debuginfo | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade httpd-manualUpgrade httpd-core-debuginfoUpgrade httpd-debugsourceUpgrade httpd-tools-debuginfoUpgrade httpd-develUpgrade httpd-coreUpgrade httpdUpgrade httpd-toolsUpgrade mod_lua-debuginfoUpgrade mod_sslUpgrade httpd-debuginfoUpgrade mod_luaUpgrade mod_session-debuginfoUpgrade httpd-filesystemUpgrade mod_proxy_htmlUpgrade mod_proxy_html-debuginfoUpgrade mod_ssl-debuginfoUpgrade mod_ldap-debuginfoUpgrade mod_ldapUpgrade mod_session | Aug 5, 2025 | Jul 14, 2025 |
| Apache Httpd | — | Upgrade to the latest version of Apache HTTPD | Jul 18, 2025 | Jul 10, 2025 |
| Debian | — | Upgrade apache2 | Jul 14, 2025 | Jul 10, 2025 |
| Freebsd | — | Upgrade apache24 | Jul 13, 2025 | Jul 11, 2025 |
| Huawei Euleros 2_0_sp10 | — | Upgrade mod_sslUpgrade httpd-toolsUpgrade httpdUpgrade httpd-filesystem | Sep 15, 2025 | Sep 9, 2025 |
| Huawei Euleros 2_0_sp11 | — | Upgrade mod_sslUpgrade httpdUpgrade httpd-toolsUpgrade httpd-filesystem | Oct 14, 2025 | Sep 9, 2025 |
| Huawei Euleros 2_0_sp12 | — | Upgrade mod_sslUpgrade httpdUpgrade httpd-toolsUpgrade httpd-filesystem | Sep 15, 2025 | Sep 9, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade httpd-filesystemUpgrade mod_sslUpgrade httpdUpgrade httpd-tools | Oct 24, 2025 | Sep 9, 2025 |
| Oracle_linux | — | Upgrade mod_mdUpgrade mod_sslUpgrade mod_sessionUpgrade mod_http2Upgrade httpd-manualUpgrade httpd-coreUpgrade httpd-develUpgrade mod_proxy_htmlUpgrade httpdUpgrade mod_luaUpgrade httpd-toolsUpgrade mod_ldapUpgrade httpd-filesystem | Sep 3, 2025 | Jul 14, 2025 |
| Redhat_linux | — | Upgrade mod_session-debuginfoUpgrade mod_sessionUpgrade mod_sslUpgrade httpd-core-debuginfoUpgrade httpd-debugsourceUpgrade mod_md-debuginfoUpgrade httpd-filesystemUpgrade mod_proxy_htmlUpgrade mod_ldapUpgrade mod_http2Upgrade mod_proxy_html-debuginfoUpgrade mod_http2-debugsourceUpgrade mod_mdUpgrade mod_luaUpgrade mod_lua-debuginfoUpgrade httpd-develUpgrade mod_ldap-debuginfoUpgrade httpd-toolsUpgrade httpd-manualUpgrade httpd-coreUpgrade mod_md-debugsourceUpgrade httpd-tools-debuginfoUpgrade mod_http2-debuginfoUpgrade httpdUpgrade mod_ssl-debuginfoNo solution existsUpgrade httpd-debuginfo | Jul 15, 2025 | Jul 10, 2025 |
| Rocky_linux | — | Upgrade httpdUpgrade httpd-debuginfoUpgrade mod_ssl-debuginfoUpgrade mod_session-debuginfoUpgrade httpd-tools-debuginfoUpgrade mod_ldapUpgrade mod_luaUpgrade mod_lua-debuginfoUpgrade mod_proxy_html-debuginfoUpgrade mod_md-debugsourceUpgrade mod_sessionUpgrade mod_mdUpgrade mod_http2-debuginfoUpgrade mod_sslUpgrade httpd-coreUpgrade mod_md-debuginfoUpgrade mod_http2Upgrade httpd-core-debuginfoUpgrade httpd-toolsUpgrade mod_http2-debugsourceUpgrade httpd-debugsourceUpgrade httpd-develUpgrade mod_proxy_htmlUpgrade mod_ldap-debuginfo | Feb 5, 2026 | Sep 8, 2025 |
| Suse | — | Upgrade apache2-tls13-preforkUpgrade apache2-preforkUpgrade apache2-tls13Upgrade apache2-tls13-develUpgrade apache2-utilsUpgrade apache2-docUpgrade apache2-eventUpgrade apache2-tls13-utilsUpgrade apache2-tls13-example-pagesUpgrade apache2-workerUpgrade apache2-example-pagesUpgrade apache2-tls13-docUpgrade apache2-develUpgrade apache2-tls13-workerUpgrade apache2-manualUpgrade apache2 | Feb 19, 2026 | Sep 9, 2025 |
| Ubuntu | — | Upgrade apache2Upgrade apache2 (Ubuntu Pro) | Jul 17, 2025 | Jul 10, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Aug 11, 2025 | Jul 10, 2025 |
Prioritise with Active Threat Intelligence
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub