{"id":"USN-5203-1","summary":"apache-log4j2 vulnerability","details":"Hideki Okamoto and Guy Lederfein discovered that Apache Log4j 2 did not\nprotect against infinite recursion in lookup evaluation. A remote attacker\ncould possibly use this issue to cause Apache Log4j 2 to crash, leading to\na denial of service.\nPlease see the following link for more information:\nhttps://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/Log4Shell\n","modified":"2026-06-01T07:15:25.056937705Z","published":"2021-12-19T17:39:38Z","related":["UBUNTU-CVE-2021-45105"],"upstream":["CVE-2021-45105","UBUNTU-CVE-2021-45105"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5203-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-45105"}],"affected":[{"package":{"name":"apache-log4j2","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/apache-log4j2?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.17.0-0.20.04.1"}]}],"versions":["2.11.1-2","2.11.2-1","2.15.0-0.20.04.1","2.16.0-0.20.04.1"],"ecosystem_specific":{"binaries":[{"binary_version":"2.17.0-0.20.04.1","binary_name":"liblog4j2-java"}],"availability":"No subscription required"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:20.04:LTS","cves":[{"severity":[{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2021-45105"}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5203-1.json"}}],"schema_version":"1.7.5"}