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The Apache HTTP Server 2.4.18 through 2.4.20, when mod_http2 and mod_ssl are enabled, does not properly recognize the "SSLVerifyClient require" directive for HTTP/2 request authorization, which allows remote attackers to bypass intended access restrictions by leveraging the ability to send multiple requests over a single connection and aborting a renegotiation.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade apache2 | Aug 30, 2017 | Jul 6, 2016 |
| Apache Httpd | — | Upgrade to the latest version of Apache HTTPD | Jul 20, 2016 | Jul 6, 2016 |
| Debian | — | Upgrade apache2 | Jul 30, 2024 | Jul 6, 2016 |
| Freebsd | — | Upgrade apache24 | Dec 10, 2025 | Jul 5, 2016 |
| Gentoo Linux | — | Upgrade www-servers/apache. | Oct 30, 2017 | Jul 6, 2016 |
| Ibm Http_server | — | Apply IBM HTTP Server version 9.0.0.1 or later | Jun 22, 2018 | Jul 6, 2016 |
| Oracle Solaris | — | Upgrade web/server/apache-24/module/apache-ldap to version 2.4.23-0.175.3.13.0.1.0 on Solaris 11.3Upgrade web/server/apache-24/module/apache-ssl-fips-140 to version 2.4.23-0.175.3.13.0.1.0 on Solaris 11.3Upgrade web/server/apache-24/module/apache-lua to version 2.4.23-0.175.3.13.0.1.0 on Solaris 11.3Upgrade web/server/apache-22 to version 2.2.31-0.175.3.13.0.1.0 on Solaris 11.3Upgrade web/server/apache-24/module/apache-ssl to version 2.4.23-0.175.3.13.0.1.0 on Solaris 11.3Upgrade web/server/apache-24/module/apache-dbd to version 2.4.23-0.175.3.13.0.1.0 on Solaris 11.3Upgrade web/server/apache-22/module/apache-sed to version 2.2.31-0.175.3.13.0.1.0 on Solaris 11.3Upgrade web/server/apache-22/documentation to version 2.2.31-0.175.3.13.0.1.0 on Solaris 11.3Upgrade web/server/apache-24 to version 2.4.23-0.175.3.13.0.1.0 on Solaris 11.3 | May 29, 2017 | Jul 6, 2016 |
| Suse | — | Upgrade apache2-utilsUpgrade apache2-docUpgrade apache2-eventUpgrade apache2-example-pagesUpgrade apache2-workerUpgrade apache2-preforkUpgrade apache2-develUpgrade apache2 | Dec 9, 2016 | Jul 6, 2016 |
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