{"id":"USN-5133-1","summary":"A security issue was fixed in ICU","details":"It was discovered that ICU contains a use after free issue.\nAn attacker could use this issue to cause a denial of service with crafted input.\n\n","modified":"2026-06-29T13:49:34.684453709Z","published":"2021-11-04T20:12:07Z","related":["UBUNTU-CVE-2020-21913"],"upstream":["CVE-2020-21913","UBUNTU-CVE-2020-21913"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5133-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-21913"}],"affected":[{"package":{"name":"icu","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/icu?arch=source&distro=trusty%2Fesm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"52.1-3ubuntu0.8+esm2"}]}],"versions":["4.8.1.1-12ubuntu2","4.8.1.1-13+nmu1","4.8.1.1-13+nmu1ubuntu1","52.1-3","52.1-3ubuntu0.2","52.1-3ubuntu0.3","52.1-3ubuntu0.4","52.1-3ubuntu0.5","52.1-3ubuntu0.6","52.1-3ubuntu0.7","52.1-3ubuntu0.8","52.1-3ubuntu0.8+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"icu-devtools","binary_version":"52.1-3ubuntu0.8+esm2"},{"binary_name":"libicu52","binary_version":"52.1-3ubuntu0.8+esm2"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5133-1.json","cves_map":{"cves":[{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"low"}],"id":"CVE-2020-21913"}],"ecosystem":"Ubuntu:Pro:14.04:LTS"}}},{"package":{"name":"icu","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/icu?arch=source&distro=esm-infra%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"55.1-7ubuntu0.5+esm1"}]}],"versions":["55.1-4ubuntu1","55.1-6ubuntu1","55.1-7","55.1-7ubuntu0.1","55.1-7ubuntu0.2","55.1-7ubuntu0.3","55.1-7ubuntu0.4","55.1-7ubuntu0.5"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"icu-devtools","binary_version":"55.1-7ubuntu0.5+esm1"},{"binary_name":"libicu55","binary_version":"55.1-7ubuntu0.5+esm1"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:16.04:LTS","cves":[{"id":"CVE-2020-21913","severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5133-1.json"}},{"package":{"name":"icu","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/icu?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"60.2-3ubuntu3.2"}]}],"versions":["57.1-6","59.1-3ubuntu1","60.1-1ubuntu2","60.2-1ubuntu1","60.2-3ubuntu1","60.2-3ubuntu3","60.2-3ubuntu3.1"],"ecosystem_specific":{"binaries":[{"binary_version":"60.2-3ubuntu3.2","binary_name":"icu-devtools"},{"binary_version":"60.2-3ubuntu3.2","binary_name":"libicu60"},{"binary_name":"libiculx60","binary_version":"60.2-3ubuntu3.2"}],"availability":"No subscription required"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:18.04:LTS","cves":[{"id":"CVE-2020-21913","severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"type":"Ubuntu","score":"low"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5133-1.json"}}],"schema_version":"1.7.5"}