What is CVE-2021-29566?

CVE-2021-29566 is a low-severity vulnerability in Google Tensorflow, classified under Out-of-bounds Write. CVSS score: 2.5/10. Published 2021-05-14.

How severe is CVE-2021-29566?

Low severity. CVSS v3 base score is 2.5 out of 10.

Buffer overflow in Google Tensorflow

CVE-2021-29566

TensorFlow is an end-to-end open source platform for machine learning. An attacker can write outside the bounds of heap allocated arrays by passing invalid arguments to `tf.raw_ops.Dilation2DBackpropInput`. This is because the implementation(https://github.com/tensorflow/tensorflow/blob/afd954e65f15aea4d438d0a219136fc4a63a573d/tensorflow/core/kernels/dilation_ops.cc#L321-L322) does not validate before writing to the output array. The values for `h_out` and `w_out` are guaranteed to be in range for `out_backprop` (as they are loop indices bounded by the size of the array). However, there are no similar guarantees relating `h_in_max`/`w_in_max` and `in_backprop`. 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.

Vulnerability class: Buffer Overflow

Published 2021-05-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 2.5 (Low). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.002 (8.9th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 9th percentile — 8.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Google Tensorflow
Tensorflow — versions < 2.1.4, >= 2.2.0, < 2.2.3, >= 2.3.0, < 2.3.3

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/tensorflow/tensorflow/security/advisories/GHSA-pvrc-hg3f-58r6 (Exploit, Patch, Third Party Advisory)
github.com/tensorflow/tensorflow/commit/3f6fe4dfef6f57e768260b48166c27d148f3015f (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-29566?: CVE-2021-29566 is a low-severity vulnerability in Google Tensorflow, classified under Out-of-bounds Write. CVSS score: 2.5/10. Published 2021-05-14.
How severe is CVE-2021-29566?: Low severity. CVSS v3 base score is 2.5 out of 10.