{"id":"CVE-2017-17051","aliases":["GHSA-vq76-rxx3-4r4r","PYSEC-2026-692"],"url":"https://o3.security/vulnerability/CVE-2017-17051","summary":"OpenStack Nova DoS by rebuilding the same instance with a new image multiple times","details":"An issue was discovered in the default FilterScheduler in OpenStack Nova 16.0.3. By repeatedly rebuilding an instance with new images, an authenticated user may consume untracked resources on a hypervisor host leading to a denial of service, aka doubled resource allocations. This regression was introduced with the fix for OSSA-2017-005 (CVE-2017-16239); however, only Nova stable/pike or later deployments with that fix applied and relying on the default FilterScheduler are affected.","published":"2017-12-05T18:29:00.227Z","modified":"2026-07-08T11:49:20.793337Z","cvss":{"score":8.6,"severity":"HIGH","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H"},"epss":{"score":0.01989,"percentile":0.79648,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"nova","fixedVersion":"16.0.4"}],"fix":{"url":"https://github.com/openstack/nova/commit/25a1d78e83065c5bea5d8e0a017fd9d0914d41d9","label":"openstack/nova@25a1d78"},"references":[{"type":"ADVISORY","url":"http://www.securityfocus.com/bid/102102"},{"type":"ADVISORY","url":"https://review.openstack.org/521662"},{"type":"ADVISORY","url":"https://review.openstack.org/523214"},{"type":"ADVISORY","url":"https://security.openstack.org/ossa/OSSA-2017-006.html"},{"type":"REPORT","url":"https://launchpad.net/bugs/1732976"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2017-17051"},{"type":"WEB","url":"https://github.com/openstack/nova/commit/25a1d78e83065c5bea5d8e0a017fd9d0914d41d9"},{"type":"WEB","url":"https://github.com/openstack/nova/commit/fed660c1189fdf4159d97badfdc8c5b35ad14f23"},{"type":"PACKAGE","url":"https://github.com/openstack/nova"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T11:49:20.793337Z"}}