{"id":"USN-4747-1","summary":"screen vulnerability","details":"Felix Weinmann discovered that GNU Screen incorrectly handled certain\ncharacter sequences. A remote attacker could use this issue to cause GNU\nScreen to crash, resulting in a denial of service, or possibly execute\narbitrary code.\n","modified":"2026-02-10T04:42:03Z","published":"2021-02-24T13:58:42Z","related":["UBUNTU-CVE-2021-26937"],"upstream":["CVE-2021-26937","UBUNTU-CVE-2021-26937"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4747-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-26937"}],"affected":[{"package":{"name":"screen","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/screen@4.3.1-2ubuntu0.1?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.3.1-2ubuntu0.1"}]}],"versions":["4.3.1-2","4.3.1-2build1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"screen","binary_version":"4.3.1-2ubuntu0.1"}]},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2021-26937","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:16.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4747-1.json"}},{"package":{"name":"screen","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/screen@4.6.2-1ubuntu1.1?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.6.2-1ubuntu1.1"}]}],"versions":["4.6.1-1","4.6.2-1","4.6.2-1ubuntu1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"screen","binary_version":"4.6.2-1ubuntu1.1"}]},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2021-26937","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:18.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4747-1.json"}},{"package":{"name":"screen","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/screen@4.8.0-1ubuntu0.1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.8.0-1ubuntu0.1"}]}],"versions":["4.6.2-3build1","4.7.0-1","4.8.0-1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"screen","binary_version":"4.8.0-1ubuntu0.1"}]},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2021-26937","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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-4747-1.json"}}],"schema_version":"1.7.3"}