{"cve":"CVE-2021-33430","nvd":{"published":"2021-12-17T19:15:07.500","modified":"2026-06-17T03:54:32.750","status":"Modified","description":"A Buffer Overflow vulnerability exists in NumPy 1.9.x in the PyArray_NewFromDescr_int function of ctors.c when specifying arrays of large dimensions (over 32) from Python code, which could let a malicious user cause a Denial of Service. NOTE: The vendor does not agree this is a vulneraility; In (very limited) circumstances a user may be able provoke the buffer overflow, the user is most likely already privileged to at least provoke denial of service by exhausting memory. Triggering this further requires the use of uncommon API (complicated structured dtypes), which is very unlikely to be available to an unprivileged user","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.3},"cwes":["CWE-120"],"references":["https://github.com/numpy/numpy/issues/18939","https://github.com/numpy/numpy/issues/18939"],"products":["numpy:numpy"],"source":"nvd","synced_at":"2026-10-19T21:25:41.256909649+00:00"},"epss":{"cve":"CVE-2021-33430","score":0.01155,"percentile":0.67015,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-6p56-wp2h-9hxr","url":"https://osv.dev/vulnerability/GHSA-6p56-wp2h-9hxr","summary":"NumPy Buffer Overflow (Disputed)","modified":"2024-09-26T15:01:21.525444Z","packages":[{"ecosystem":"PyPI","name":"numpy","purl":"pkg:pypi/numpy","ranges":[">=1.9.0 <1.21"],"fixed":["1.21"]}]},{"id":"PYSEC-2021-854","url":"https://osv.dev/vulnerability/PYSEC-2021-854","summary":"","modified":"2023-11-08T04:06:04.438690Z","packages":[{"ecosystem":"PyPI","name":"numpy","purl":"pkg:pypi/numpy","ranges":[">=1.9.0 <1.10.0"],"fixed":["1.10.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}