{"id":"UBUNTU-CVE-2021-33586","details":"InspIRCd 3.8.0 through 3.9.x before 3.10.0 allows any user (able to connect to the server) to access recently deallocated memory, aka the \"malformed PONG\" issue.","modified":"2026-02-04T04:20:42.318558Z","published":"2021-05-27T05:15:00Z","withdrawn":"2025-06-23T15:54:03Z","related":["CVE-2021-33586"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-33586"},{"type":"REPORT","url":"https://docs.inspircd.org/security/2021-01/"},{"type":"REPORT","url":"https://github.com/inspircd/inspircd/commit/4350a11c663b0d75f8119743bffb7736d87abd4d"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-33586"}],"affected":[{"package":{"name":"inspircd","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/inspircd@2.0.20-5build2?arch=source&distro=esm-apps/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.20-3","2.0.20-4","2.0.20-5","2.0.20-5build1","2.0.20-5build2"],"ecosystem_specific":{"ubuntu_priority":"medium"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-33586.json"}},{"package":{"name":"inspircd","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/inspircd@2.0.24-1ubuntu1?arch=source&distro=esm-apps/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.24-1ubuntu1"],"ecosystem_specific":{"ubuntu_priority":"medium"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-33586.json"}},{"package":{"name":"inspircd","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/inspircd@3.4.0-2ubuntu1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.27-1ubuntu2","3.4.0-2ubuntu1"],"ecosystem_specific":{"ubuntu_priority":"medium"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-33586.json"}},{"package":{"name":"inspircd","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/inspircd@3.12.0-1build1?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.8.1-2build1","3.12.0-1","3.12.0-1build1"],"ecosystem_specific":{"ubuntu_priority":"medium"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-33586.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"}]}