{"id":"UBUNTU-CVE-2021-45115","details":"An issue was discovered in Django 2.2 before 2.2.26, 3.2 before 3.2.11, and 4.0 before 4.0.1. UserAttributeSimilarityValidator incurred significant overhead in evaluating a submitted password that was artificially large in relation to the comparison values. In a situation where access to user registration was unrestricted, this provided a potential vector for a denial-of-service attack.","modified":"2026-04-13T12:03:33.151821Z","published":"2022-01-04T10:00:00Z","related":["USN-5204-1"],"upstream":["CVE-2021-45115"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-45115"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5204-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-45115"}],"affected":[{"package":{"name":"python-django","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/python-django@1.6.11-0ubuntu1.3+esm11?arch=source&distro=esm-infra-legacy/trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.5.4-1ubuntu1","1.6-1","1.6.1-1","1.6.1-2","1.6.1-2ubuntu0.1","1.6.1-2ubuntu0.2","1.6.1-2ubuntu0.3","1.6.1-2ubuntu0.4","1.6.1-2ubuntu0.5","1.6.1-2ubuntu0.6","1.6.1-2ubuntu0.8","1.6.1-2ubuntu0.9","1.6.1-2ubuntu0.10","1.6.1-2ubuntu0.11","1.6.1-2ubuntu0.12","1.6.1-2ubuntu0.13","1.6.1-2ubuntu0.14","1.6.1-2ubuntu0.15","1.6.1-2ubuntu0.16","1.6.11-0ubuntu1","1.6.11-0ubuntu1.1","1.6.11-0ubuntu1.2","1.6.11-0ubuntu1.3","1.6.11-0ubuntu1.3+esm1","1.6.11-0ubuntu1.3+esm2","1.6.11-0ubuntu1.3+esm3","1.6.11-0ubuntu1.3+esm4","1.6.11-0ubuntu1.3+esm5","1.6.11-0ubuntu1.3+esm6","1.6.11-0ubuntu1.3+esm7","1.6.11-0ubuntu1.3+esm8","1.6.11-0ubuntu1.3+esm9","1.6.11-0ubuntu1.3+esm10","1.6.11-0ubuntu1.3+esm11"],"ecosystem_specific":{"binaries":[{"binary_version":"1.6.11-0ubuntu1.3+esm11","binary_name":"python-django"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-45115.json"}},{"package":{"name":"python-django","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/python-django@1.8.7-1ubuntu5.15+esm12?arch=source&distro=esm-infra/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.7.9-1ubuntu5","1.8.5-2ubuntu1","1.8.7-1ubuntu1","1.8.7-1ubuntu2","1.8.7-1ubuntu3","1.8.7-1ubuntu4","1.8.7-1ubuntu5","1.8.7-1ubuntu5.1","1.8.7-1ubuntu5.2","1.8.7-1ubuntu5.4","1.8.7-1ubuntu5.5","1.8.7-1ubuntu5.6","1.8.7-1ubuntu5.7","1.8.7-1ubuntu5.8","1.8.7-1ubuntu5.9","1.8.7-1ubuntu5.10","1.8.7-1ubuntu5.11","1.8.7-1ubuntu5.12","1.8.7-1ubuntu5.13","1.8.7-1ubuntu5.14","1.8.7-1ubuntu5.15","1.8.7-1ubuntu5.15+esm1","1.8.7-1ubuntu5.15+esm3","1.8.7-1ubuntu5.15+esm4","1.8.7-1ubuntu5.15+esm5","1.8.7-1ubuntu5.15+esm6","1.8.7-1ubuntu5.15+esm7","1.8.7-1ubuntu5.15+esm8","1.8.7-1ubuntu5.15+esm9","1.8.7-1ubuntu5.15+esm10","1.8.7-1ubuntu5.15+esm11","1.8.7-1ubuntu5.15+esm12"],"ecosystem_specific":{"binaries":[{"binary_version":"1.8.7-1ubuntu5.15+esm12","binary_name":"python-django"},{"binary_version":"1.8.7-1ubuntu5.15+esm12","binary_name":"python-django-common"},{"binary_version":"1.8.7-1ubuntu5.15+esm12","binary_name":"python3-django"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-45115.json"}},{"package":{"name":"python-django","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/python-django@1:1.11.11-1ubuntu1.15?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:1.11.11-1ubuntu1.15"}]}],"versions":["1:1.11.4-1ubuntu1","1:1.11.6-1ubuntu1","1:1.11.9-1ubuntu1","1:1.11.11-1ubuntu1","1:1.11.11-1ubuntu1.1","1:1.11.11-1ubuntu1.2","1:1.11.11-1ubuntu1.3","1:1.11.11-1ubuntu1.4","1:1.11.11-1ubuntu1.5","1:1.11.11-1ubuntu1.6","1:1.11.11-1ubuntu1.7","1:1.11.11-1ubuntu1.8","1:1.11.11-1ubuntu1.9","1:1.11.11-1ubuntu1.10","1:1.11.11-1ubuntu1.11","1:1.11.11-1ubuntu1.12","1:1.11.11-1ubuntu1.13","1:1.11.11-1ubuntu1.14"],"ecosystem_specific":{"binaries":[{"binary_version":"1:1.11.11-1ubuntu1.15","binary_name":"python-django"},{"binary_version":"1:1.11.11-1ubuntu1.15","binary_name":"python-django-common"},{"binary_version":"1:1.11.11-1ubuntu1.15","binary_name":"python3-django"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-45115.json"}},{"package":{"name":"python-django","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/python-django@2:2.2.12-1ubuntu0.9?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:2.2.12-1ubuntu0.9"}]}],"versions":["1:1.11.22-1ubuntu1","2:2.2.6-1ubuntu1","2:2.2.9-2ubuntu1","2:2.2.10-1","2:2.2.10-1ubuntu1","2:2.2.11-1","2:2.2.12-1","2:2.2.12-1ubuntu0.1","2:2.2.12-1ubuntu0.2","2:2.2.12-1ubuntu0.3","2:2.2.12-1ubuntu0.4","2:2.2.12-1ubuntu0.5","2:2.2.12-1ubuntu0.6","2:2.2.12-1ubuntu0.7","2:2.2.12-1ubuntu0.8"],"ecosystem_specific":{"binaries":[{"binary_version":"2:2.2.12-1ubuntu0.9","binary_name":"python3-django"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-45115.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}