{"id":"UBUNTU-CVE-2025-49630","details":"In certain proxy configurations, a denial of service attack against Apache HTTP Server versions 2.4.26 through to 2.4.63 can be triggered by untrusted clients causing an assertion in mod_proxy_http2. Configurations affected are a reverse proxy is configured for an HTTP/2 backend, with ProxyPreserveHost set to \"on\".","modified":"2026-04-22T16:03:46.870582Z","published":"2025-07-10T17:15:00Z","related":["USN-7639-1","USN-7639-2"],"upstream":["CVE-2025-49630"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-49630"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2025-49630"},{"type":"REPORT","url":"https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2025-49630"},{"type":"REPORT","url":"https://httpd.apache.org/security/vulnerabilities_24.html"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-7639-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-7639-2"}],"affected":[{"package":{"name":"apache2","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/apache2@2.4.29-1ubuntu4.27+esm6?arch=source&distro=esm-infra/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.29-1ubuntu4.27+esm6"}]}],"versions":["2.4.27-2ubuntu3","2.4.29-1ubuntu1","2.4.29-1ubuntu2","2.4.29-1ubuntu3","2.4.29-1ubuntu4","2.4.29-1ubuntu4.1","2.4.29-1ubuntu4.2","2.4.29-1ubuntu4.3","2.4.29-1ubuntu4.4","2.4.29-1ubuntu4.5","2.4.29-1ubuntu4.6","2.4.29-1ubuntu4.7","2.4.29-1ubuntu4.8","2.4.29-1ubuntu4.10","2.4.29-1ubuntu4.11","2.4.29-1ubuntu4.12","2.4.29-1ubuntu4.13","2.4.29-1ubuntu4.14","2.4.29-1ubuntu4.16","2.4.29-1ubuntu4.17","2.4.29-1ubuntu4.18","2.4.29-1ubuntu4.19","2.4.29-1ubuntu4.20","2.4.29-1ubuntu4.21","2.4.29-1ubuntu4.22","2.4.29-1ubuntu4.23","2.4.29-1ubuntu4.24","2.4.29-1ubuntu4.25","2.4.29-1ubuntu4.26","2.4.29-1ubuntu4.27","2.4.29-1ubuntu4.27+esm1","2.4.29-1ubuntu4.27+esm2","2.4.29-1ubuntu4.27+esm3","2.4.29-1ubuntu4.27+esm4"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"apache2","binary_version":"2.4.29-1ubuntu4.27+esm6"},{"binary_name":"apache2-bin","binary_version":"2.4.29-1ubuntu4.27+esm6"},{"binary_name":"apache2-data","binary_version":"2.4.29-1ubuntu4.27+esm6"},{"binary_name":"apache2-suexec-custom","binary_version":"2.4.29-1ubuntu4.27+esm6"},{"binary_name":"apache2-suexec-pristine","binary_version":"2.4.29-1ubuntu4.27+esm6"},{"binary_name":"apache2-utils","binary_version":"2.4.29-1ubuntu4.27+esm6"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-49630.json"}},{"package":{"name":"apache2","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/apache2@2.4.41-4ubuntu3.23+esm2?arch=source&distro=esm-infra/focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.41-4ubuntu3.23+esm2"}]}],"versions":["2.4.41-1ubuntu1","2.4.41-4ubuntu1","2.4.41-4ubuntu2","2.4.41-4ubuntu3","2.4.41-4ubuntu3.1","2.4.41-4ubuntu3.3","2.4.41-4ubuntu3.4","2.4.41-4ubuntu3.5","2.4.41-4ubuntu3.6","2.4.41-4ubuntu3.7","2.4.41-4ubuntu3.8","2.4.41-4ubuntu3.9","2.4.41-4ubuntu3.10","2.4.41-4ubuntu3.11","2.4.41-4ubuntu3.12","2.4.41-4ubuntu3.13","2.4.41-4ubuntu3.14","2.4.41-4ubuntu3.15","2.4.41-4ubuntu3.16","2.4.41-4ubuntu3.17","2.4.41-4ubuntu3.19","2.4.41-4ubuntu3.20","2.4.41-4ubuntu3.21","2.4.41-4ubuntu3.23"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"apache2","binary_version":"2.4.41-4ubuntu3.23+esm2"},{"binary_name":"apache2-bin","binary_version":"2.4.41-4ubuntu3.23+esm2"},{"binary_version":"2.4.41-4ubuntu3.23+esm2","binary_name":"apache2-data"},{"binary_name":"apache2-suexec-custom","binary_version":"2.4.41-4ubuntu3.23+esm2"},{"binary_name":"apache2-suexec-pristine","binary_version":"2.4.41-4ubuntu3.23+esm2"},{"binary_name":"apache2-utils","binary_version":"2.4.41-4ubuntu3.23+esm2"},{"binary_name":"libapache2-mod-md","binary_version":"2.4.41-4ubuntu3.23+esm2"},{"binary_name":"libapache2-mod-proxy-uwsgi","binary_version":"2.4.41-4ubuntu3.23+esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-49630.json"}},{"package":{"name":"apache2","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/apache2@2.4.52-1ubuntu4.15?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.52-1ubuntu4.15"}]}],"versions":["2.4.48-3.1ubuntu3","2.4.48-3.1ubuntu4","2.4.51-2ubuntu1","2.4.52-1ubuntu1","2.4.52-1ubuntu2","2.4.52-1ubuntu4","2.4.52-1ubuntu4.1","2.4.52-1ubuntu4.2","2.4.52-1ubuntu4.3","2.4.52-1ubuntu4.4","2.4.52-1ubuntu4.5","2.4.52-1ubuntu4.6","2.4.52-1ubuntu4.7","2.4.52-1ubuntu4.8","2.4.52-1ubuntu4.9","2.4.52-1ubuntu4.10","2.4.52-1ubuntu4.11","2.4.52-1ubuntu4.12","2.4.52-1ubuntu4.13","2.4.52-1ubuntu4.14"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"apache2","binary_version":"2.4.52-1ubuntu4.15"},{"binary_name":"apache2-bin","binary_version":"2.4.52-1ubuntu4.15"},{"binary_version":"2.4.52-1ubuntu4.15","binary_name":"apache2-data"},{"binary_name":"apache2-suexec-custom","binary_version":"2.4.52-1ubuntu4.15"},{"binary_name":"apache2-suexec-pristine","binary_version":"2.4.52-1ubuntu4.15"},{"binary_name":"apache2-utils","binary_version":"2.4.52-1ubuntu4.15"},{"binary_name":"libapache2-mod-md","binary_version":"2.4.52-1ubuntu4.15"},{"binary_name":"libapache2-mod-proxy-uwsgi","binary_version":"2.4.52-1ubuntu4.15"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-49630.json"}},{"package":{"name":"apache2","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/apache2@2.4.58-1ubuntu8.7?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.58-1ubuntu8.7"}]}],"versions":["2.4.57-2ubuntu2","2.4.57-2ubuntu3","2.4.58-1ubuntu1","2.4.58-1ubuntu2","2.4.58-1ubuntu6","2.4.58-1ubuntu7","2.4.58-1ubuntu8","2.4.58-1ubuntu8.1","2.4.58-1ubuntu8.2","2.4.58-1ubuntu8.3","2.4.58-1ubuntu8.4","2.4.58-1ubuntu8.5","2.4.58-1ubuntu8.6"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"apache2","binary_version":"2.4.58-1ubuntu8.7"},{"binary_name":"apache2-bin","binary_version":"2.4.58-1ubuntu8.7"},{"binary_version":"2.4.58-1ubuntu8.7","binary_name":"apache2-data"},{"binary_name":"apache2-suexec-custom","binary_version":"2.4.58-1ubuntu8.7"},{"binary_name":"apache2-suexec-pristine","binary_version":"2.4.58-1ubuntu8.7"},{"binary_name":"apache2-utils","binary_version":"2.4.58-1ubuntu8.7"},{"binary_name":"libapache2-mod-md","binary_version":"2.4.58-1ubuntu8.7"},{"binary_name":"libapache2-mod-proxy-uwsgi","binary_version":"2.4.58-1ubuntu8.7"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-49630.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}