{"cve":"CVE-2021-37659","nvd":{"published":"2021-08-12T21:15:08.763","modified":"2026-06-17T04:00:55.550","status":"Modified","description":"TensorFlow is an end-to-end open source platform for machine learning. In affected versions an attacker can cause undefined behavior via binding a reference to null pointer in all binary cwise operations that don't require broadcasting (e.g., gradients of binary cwise operations). The [implementation](https://github.com/tensorflow/tensorflow/blob/84d053187cb80d975ef2b9684d4b61981bca0c41/tensorflow/core/kernels/cwise_ops_common.h#L264) assumes that the two inputs have exactly the same number of elements but does not check that. Hence, when the eigen functor executes it triggers heap OOB reads and undefined behavior due to binding to nullptr. We have patched the issue in GitHub commit 93f428fd1768df147171ed674fee1fc5ab8309ec. The fix will be included in TensorFlow 2.6.0. We will also cherrypick this commit on TensorFlow 2.5.1, TensorFlow 2.4.3, and TensorFlow 2.3.4, as these are also affected and still in supported range.","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-125","CWE-476"],"references":["https://github.com/tensorflow/tensorflow/commit/93f428fd1768df147171ed674fee1fc5ab8309ec","https://github.com/tensorflow/tensorflow/security/advisories/GHSA-q3g3-h9r4-prrc","https://github.com/tensorflow/tensorflow/commit/93f428fd1768df147171ed674fee1fc5ab8309ec","https://github.com/tensorflow/tensorflow/security/advisories/GHSA-q3g3-h9r4-prrc"],"products":["google:tensorflow"],"source":"nvd","synced_at":"2026-10-19T21:21:57.125947417+00:00"},"epss":{"cve":"CVE-2021-37659","score":0.00176,"percentile":0.07117,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-q3g3-h9r4-prrc","url":"https://osv.dev/vulnerability/GHSA-q3g3-h9r4-prrc","summary":"Reference binding to nullptr and heap OOB in binary cwise ops","modified":"2026-09-10T03:49:15.968526345Z","packages":[{"ecosystem":"PyPI","name":"tensorflow","purl":"pkg:pypi/tensorflow","ranges":["<2.3.4"],"fixed":["2.3.4"]},{"ecosystem":"PyPI","name":"tensorflow","purl":"pkg:pypi/tensorflow","ranges":[">=2.4.0 <2.4.3"],"fixed":["2.4.3"]},{"ecosystem":"PyPI","name":"tensorflow","purl":"pkg:pypi/tensorflow","ranges":[">=2.5.0 <2.5.1"],"fixed":["2.5.1"]},{"ecosystem":"PyPI","name":"tensorflow-cpu","purl":"pkg:pypi/tensorflow-cpu","ranges":["<2.3.4"],"fixed":["2.3.4"]},{"ecosystem":"PyPI","name":"tensorflow-cpu","purl":"pkg:pypi/tensorflow-cpu","ranges":[">=2.4.0 <2.4.3"],"fixed":["2.4.3"]},{"ecosystem":"PyPI","name":"tensorflow-cpu","purl":"pkg:pypi/tensorflow-cpu","ranges":[">=2.5.0 <2.5.1"],"fixed":["2.5.1"]},{"ecosystem":"PyPI","name":"tensorflow-gpu","purl":"pkg:pypi/tensorflow-gpu","ranges":["<2.3.4"],"fixed":["2.3.4"]},{"ecosystem":"PyPI","name":"tensorflow-gpu","purl":"pkg:pypi/tensorflow-gpu","ranges":[">=2.4.0 <2.4.3"],"fixed":["2.4.3"]},{"ecosystem":"PyPI","name":"tensorflow-gpu","purl":"pkg:pypi/tensorflow-gpu","ranges":[">=2.5.0 <2.5.1"],"fixed":["2.5.1"]}]},{"id":"PYSEC-2021-281","url":"https://osv.dev/vulnerability/PYSEC-2021-281","summary":"","modified":"2023-12-06T01:01:22.693271Z","packages":[{"ecosystem":"PyPI","name":"tensorflow","purl":"pkg:pypi/tensorflow","ranges":[">=2.3.0 <2.3.4",">=2.4.0 <2.4.3"],"fixed":["2.3.4","2.4.3"]}]},{"id":"PYSEC-2021-572","url":"https://osv.dev/vulnerability/PYSEC-2021-572","summary":"","modified":"2023-12-06T01:01:22.693271Z","packages":[{"ecosystem":"PyPI","name":"tensorflow-cpu","purl":"pkg:pypi/tensorflow-cpu","ranges":[">=2.3.0 <2.3.4",">=2.4.0 <2.4.3"],"fixed":["2.3.4","2.4.3"]}]},{"id":"PYSEC-2021-770","url":"https://osv.dev/vulnerability/PYSEC-2021-770","summary":"","modified":"2023-12-06T01:01:22.693271Z","packages":[{"ecosystem":"PyPI","name":"tensorflow-gpu","purl":"pkg:pypi/tensorflow-gpu","ranges":[">=2.3.0 <2.3.4",">=2.4.0 <2.4.3"],"fixed":["2.3.4","2.4.3"]}]}],"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."]}