{"id":"UBUNTU-CVE-2025-4444","details":"A security flaw has been discovered in Tor up to 0.4.7.16/0.4.8.17. Impacted is an unknown function of the component Onion Service Descriptor Handler. Performing manipulation results in resource consumption. The attack may be initiated remotely. The attack's complexity is rated as high. The exploitability is considered difficult. Upgrading to version 0.4.8.18 and 0.4.9.3-alpha is recommended to address this issue. It is recommended to upgrade the affected component.","modified":"2026-08-26T17:30:10.161794156Z","published":"2025-09-18T14:15:00Z","upstream":["CVE-2025-4444"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-4444"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2025-4444"},{"type":"REPORT","url":"https://github.com/chunmianwang/Tordos"},{"type":"REPORT","url":"https://forum.torproject.org/t/alpha-and-stable-release-0-4-8-18-and-0-4-9-3-alpha/20578"},{"type":"REPORT","url":"https://gitlab.torproject.org/tpo/core/tor/-/raw/release-0.4.8/ReleaseNotes"},{"type":"REPORT","url":"https://vuldb.com/?ctiid.324814"},{"type":"REPORT","url":"https://vuldb.com/?id.324814"},{"type":"REPORT","url":"https://vuldb.com/?submit.640605"}],"affected":[{"package":{"name":"tor","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/tor?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.2.3.25-1","0.2.4.19-1","0.2.4.20-1","0.2.4.27-1build0.14.04.1","0.2.4.27-1ubuntu0.1","0.2.4.27-1ubuntu0.1+esm1","0.2.4.27-1ubuntu0.1+esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"tor","binary_version":"0.2.4.27-1ubuntu0.1+esm2"},{"binary_version":"0.2.4.27-1ubuntu0.1+esm2","binary_name":"tor-geoipdb"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-4444.json"}},{"package":{"name":"tor","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/tor?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.2.6.10-1ubuntu2","0.2.7.6-1ubuntu1","0.2.9.11-1ubuntu1~16.04.1","0.2.9.14-1ubuntu1~16.04.1","0.2.9.14-1ubuntu1~16.04.2","0.2.9.14-1ubuntu1~16.04.3","0.2.9.14-1ubuntu1~16.04.3+esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.2.9.14-1ubuntu1~16.04.3+esm1","binary_name":"tor"},{"binary_name":"tor-geoipdb","binary_version":"0.2.9.14-1ubuntu1~16.04.3+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-4444.json"}},{"package":{"name":"tor","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/tor?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.3.0.10-1","0.3.1.8-2","0.3.1.9-1","0.3.2.9-1","0.3.2.9-1build1","0.3.2.10-1","0.3.2.10-1ubuntu0.1","0.3.2.10-1ubuntu0.2~esm1","0.3.2.10-1ubuntu0.2~esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"tor","binary_version":"0.3.2.10-1ubuntu0.2~esm2"},{"binary_name":"tor-geoipdb","binary_version":"0.3.2.10-1ubuntu0.2~esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-4444.json"}},{"package":{"name":"tor","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/tor?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4.1.5-1","0.4.1.5-1build1","0.4.1.6-1","0.4.2.5-1","0.4.2.6-1","0.4.2.7-1","0.4.2.7-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"tor","binary_version":"0.4.2.7-1ubuntu0.1~esm1"},{"binary_version":"0.4.2.7-1ubuntu0.1~esm1","binary_name":"tor-geoipdb"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-4444.json"}},{"package":{"name":"tor","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/tor?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4.5.9-1","0.4.6.8-1","0.4.6.8-1build1","0.4.6.9-1","0.4.6.10-1","0.4.9.11-0ubuntu0.22.04.1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.4.9.11-0ubuntu0.22.04.1","binary_name":"tor"},{"binary_name":"tor-geoipdb","binary_version":"0.4.9.11-0ubuntu0.22.04.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-4444.json"}},{"package":{"name":"tor","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/tor?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4.8.4-2","0.4.8.7-1","0.4.8.9-1","0.4.8.10-1","0.4.8.10-1build1","0.4.8.10-1build2","0.4.9.11-0ubuntu0.24.04.1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.4.9.11-0ubuntu0.24.04.1","binary_name":"tor"},{"binary_version":"0.4.9.11-0ubuntu0.24.04.1","binary_name":"tor-geoipdb"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-4444.json"}},{"package":{"name":"tor","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/tor?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4.8.14-1","0.4.8.16-1"],"ecosystem_specific":{"binaries":[{"binary_name":"tor","binary_version":"0.4.8.16-1"},{"binary_name":"tor-geoipdb","binary_version":"0.4.8.16-1"}]},"database_specific":{"source":"https: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