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Low severityNVD Advisory· Published May 14, 2021· Updated Aug 3, 2024

Division by zero in TFLite's implementation of `BatchToSpaceNd`

CVE-2021-29593

Description

TensorFlow is an end-to-end open source platform for machine learning. The implementation of the BatchToSpaceNd TFLite operator is vulnerable to a division by zero error(https://github.com/tensorflow/tensorflow/blob/b5ed552fe55895aee8bd8b191f744a069957d18d/tensorflow/lite/kernels/batch_to_space_nd.cc#L81-L82). An attacker can craft a model such that one dimension of the block input is 0. Hence, the corresponding value in block_shape is 0. The fix will be included in TensorFlow 2.5.0. We will also cherrypick this commit on TensorFlow 2.4.2, TensorFlow 2.3.3, TensorFlow 2.2.3 and TensorFlow 2.1.4, as these are also affected and still in supported range.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
tensorflowPyPI
< 2.1.42.1.4
tensorflowPyPI
>= 2.2.0, < 2.2.32.2.3
tensorflowPyPI
>= 2.3.0, < 2.3.32.3.3
tensorflowPyPI
>= 2.4.0, < 2.4.22.4.2
tensorflow-cpuPyPI
< 2.1.42.1.4
tensorflow-cpuPyPI
>= 2.2.0, < 2.2.32.2.3
tensorflow-cpuPyPI
>= 2.3.0, < 2.3.32.3.3
tensorflow-cpuPyPI
>= 2.4.0, < 2.4.22.4.2
tensorflow-gpuPyPI
< 2.1.42.1.4
tensorflow-gpuPyPI
>= 2.2.0, < 2.2.32.2.3
tensorflow-gpuPyPI
>= 2.3.0, < 2.3.32.3.3
tensorflow-gpuPyPI
>= 2.4.0, < 2.4.22.4.2

Affected products

1

Patches

1
2c74674348a4

Prevent division by 0

https://github.com/tensorflow/tensorflowMihai MaruseacApr 28, 2021via ghsa
commit
1 file changed · +1 −0
  • tensorflow/lite/kernels/batch_to_space_nd.cc+1 −0 modified
    @@ -78,6 +78,7 @@ TfLiteStatus ResizeOutputTensor(TfLiteContext* context,
   int output_batch_size = input_size->data[0];
   for (int dim = 0; dim < spatial_dims_num; ++dim) {
     // Number of batch must be multiple of (block_shape[dim]).
+    TF_LITE_ENSURE(context, block_shape[dim] != 0);
     TF_LITE_ENSURE_EQ(context, output_batch_size % block_shape[dim], 0);
     output_batch_size = output_batch_size / block_shape[dim];
     output_size->data[dim + 1] = input_size->data[dim + 1] * block_shape[dim] -

Vulnerability mechanics

Generated by null/stub on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.

References

8

News mentions

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