{"id":"USN-5053-1","summary":"libssh vulnerability","details":"It was discovered that libssh incorrectly handled rekeying. A remote\nattacker could use this issue to cause libssh to crash, resulting in a\ndenial of service, or possibly execute arbitrary code.\n","modified":"2026-04-22T10:31:45.260526Z","published":"2021-08-26T15:37:38Z","related":["UBUNTU-CVE-2021-3634"],"upstream":["CVE-2021-3634","UBUNTU-CVE-2021-3634"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5053-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-3634"}],"affected":[{"package":{"name":"libssh","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/libssh@0.9.3-2ubuntu2.2?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.3-2ubuntu2.2"}]}],"versions":["0.9.0-1ubuntu1","0.9.0-1ubuntu4","0.9.0-1ubuntu5","0.9.3-2ubuntu1","0.9.3-2ubuntu2","0.9.3-2ubuntu2.1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"libssh-4","binary_version":"0.9.3-2ubuntu2.2"},{"binary_name":"libssh-gcrypt-4","binary_version":"0.9.3-2ubuntu2.2"}]},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2021-3634","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:20.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5053-1.json"}}],"schema_version":"1.7.5"}