{"cve":"CVE-2021-41220","nvd":{"published":"2021-11-05T23:15:08.350","modified":"2026-06-17T04:08:07.313","status":"Modified","description":"TensorFlow is an open source platform for machine learning. In affected versions the async implementation of `CollectiveReduceV2` suffers from a memory leak and a use after free. This occurs due to the asynchronous computation and the fact that objects that have been `std::move()`d from are still accessed. The fix will be included in TensorFlow 2.7.0. We will also cherrypick this commit on TensorFlow 2.6.1, as this version is the only one that is also affected.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-416"],"references":["https://github.com/tensorflow/tensorflow/commit/ca38dab9d3ee66c5de06f11af9a4b1200da5ef75","https://github.com/tensorflow/tensorflow/security/advisories/GHSA-gpfh-jvf9-7wg5","https://github.com/tensorflow/tensorflow/commit/ca38dab9d3ee66c5de06f11af9a4b1200da5ef75","https://github.com/tensorflow/tensorflow/security/advisories/GHSA-gpfh-jvf9-7wg5"],"products":["google:tensorflow"],"source":"nvd","synced_at":"2026-10-19T21:24:39.218183596+00:00"},"epss":{"cve":"CVE-2021-41220","score":0.00211,"percentile":0.11334,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-gpfh-jvf9-7wg5","url":"https://osv.dev/vulnerability/GHSA-gpfh-jvf9-7wg5","summary":"Use after free / memory leak in `CollectiveReduceV2`","modified":"2026-07-08T06:28:10.310979816Z","packages":[{"ecosystem":"PyPI","name":"tensorflow","purl":"pkg:pypi/tensorflow","ranges":[">=2.6.0 <2.6.1"],"fixed":["2.6.1"]},{"ecosystem":"PyPI","name":"tensorflow-cpu","purl":"pkg:pypi/tensorflow-cpu","ranges":[">=2.6.0 <2.6.1"],"fixed":["2.6.1"]},{"ecosystem":"PyPI","name":"tensorflow-gpu","purl":"pkg:pypi/tensorflow-gpu","ranges":[">=2.6.0 <2.6.1"],"fixed":["2.6.1"]}]},{"id":"PYSEC-2021-412","url":"https://osv.dev/vulnerability/PYSEC-2021-412","summary":"","modified":"2023-12-06T01:01:34.948938Z","packages":[{"ecosystem":"PyPI","name":"tensorflow","purl":"pkg:pypi/tensorflow","ranges":[">=2.6.0 <2.6.1",">=2.7.0rc0 <2.7.0"],"fixed":["2.6.1","2.7.0"]}]},{"id":"PYSEC-2021-629","url":"https://osv.dev/vulnerability/PYSEC-2021-629","summary":"","modified":"2023-12-06T01:01:34.948938Z","packages":[{"ecosystem":"PyPI","name":"tensorflow-cpu","purl":"pkg:pypi/tensorflow-cpu","ranges":[">=2.6.0 <2.6.1",">=2.7.0rc0 <2.7.0"],"fixed":["2.6.1","2.7.0"]}]},{"id":"PYSEC-2021-827","url":"https://osv.dev/vulnerability/PYSEC-2021-827","summary":"","modified":"2023-12-06T01:01:34.948938Z","packages":[{"ecosystem":"PyPI","name":"tensorflow-gpu","purl":"pkg:pypi/tensorflow-gpu","ranges":[">=2.6.0 <2.6.1",">=2.7.0rc0 <2.7.0"],"fixed":["2.6.1","2.7.0"]}]}],"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."]}