Answer in brief
CVE-2021-37666 records a High severity (CVSS 7.8) vulnerability in Reference binding to nullptr in `RaggedTensorToVariant`. The current sources do not mark it as known exploited. The current feed maps tensorflow (pypi), tensorflow (pypi), tensorflow (pypi), tensorflow-cpu (pypi) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps tensorflow (pypi), tensorflow (pypi), tensorflow (pypi), tensorflow-cpu (pypi) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| tensorflowpypi | >=0 <2.3.4 | 2.3.4 |
| tensorflowpypi | >=2.4.0 <2.4.3 | 2.4.3 |
| tensorflowpypi | >=2.5.0 <2.5.1 | 2.5.1 |
| tensorflow-cpupypi | >=0 <2.3.4 | 2.3.4 |
| tensorflow-cpupypi | >=2.4.0 <2.4.3 | 2.4.3 |
| tensorflow-cpupypi | >=2.5.0 <2.5.1 | 2.5.1 |
| tensorflow-gpupypi | >=0 <2.3.4 | 2.3.4 |
| tensorflow-gpupypi | >=2.4.0 <2.4.3 | 2.4.3 |
| tensorflow-gpupypi | >=2.5.0 <2.5.1 | 2.5.1 |
Published upstream
Aug 25, 2021
Evidence: source:osv:source_dates:source-dates:recordSource modified
Sep 10, 2026
Evidence: source:osv:source_dates:source-dates:recordFirst seen by HOL
Aug 7, 2026
### Impact An attacker can cause undefined behavior via binding a reference to null pointer in `tf.raw_ops.RaggedTensorToVariant`: ```python import tensorflow as tf tf.raw_ops.RaggedTensorToVariant( rt_nested_splits=[], rt_dense_values=[1,2,3], batched_input=True) ``` The [implementation](https://github.com/tensorflow/tensorflow/blob/460e000de3a83278fb00b61a16d161b1964f15f4/tensorflow/core/kernels/ragged_tensor_to_variant_op.cc#L129) has an incomplete validation of the splits values, missing the case when the argument would be empty. ### Patches We have patched the issue in GitHub commit [be7a4de6adfbd303ce08be4332554dff70362612](https://github.com/tensorflow/tensorflow/commit/be7a4de6adfbd303ce08be4332554dff70362612). 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. ### For more information Please consult [our security guide](https://github.com/tensorflow/tensorflow/blob/master/SECURITY.md) for more information regarding the security model and how to contact us with issues and questions. ### Attribution This vulnerability has been reported by members of the Aivul Team from Qihoo 360.
Quoted source text, attributed separately from HOL analysis.