CVE-2021-41211

Heap OOB read in shape inference for `QuantizeV2`

HIGH

7.1

CVSS Score

Published: November 5, 2021 at 08:15 PM UTC

Updated: June 17, 2026 at 04:08 AM UTC

2 products affected across 2 vendorsTensorflowTensorFlow

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Severity

HIGH7.1

Exploit prediction

EPSS 0.2%

Description

TensorFlow is an open source platform for machine learning. In affected versions the shape inference code for `QuantizeV2` can trigger a read outside of bounds of heap allocated array. This occurs whenever `axis` is a negative value less than `-1`. In this case, we are accessing data before the start of a heap buffer. The code allows `axis` to be an optional argument (`s` would contain an `error::NOT_FOUND` error code). Otherwise, it assumes that `axis` is a valid index into the dimensions of the `input` tensor. If `axis` is less than `-1` then this results in a heap OOB read. 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.