What is CVE-2021-29591?

CVE-2021-29591 is a high-severity vulnerability in Google Tensorflow, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 7.3/10. Published 2021-05-14.

How severe is CVE-2021-29591?

High severity. CVSS v3 base score is 7.3 out of 10.

Is CVE-2021-29591 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Google Tensorflow

CVE-2021-29591

TensorFlow is an end-to-end open source platform for machine learning. TFlite graphs must not have loops between nodes. However, this condition was not checked and an attacker could craft models that would result in infinite loop during evaluation. In certain cases, the infinite loop would be replaced by stack overflow due to too many recursive calls. For example, the `While` implementation(https://github.com/tensorflow/tensorflow/blob/106d8f4fb89335a2c52d7c895b7a7485465ca8d9/tensorflow/lite/kernels/while.cc) could be tricked into a scneario where both the body and the loop subgraphs are the same. Evaluating one of the subgraphs means calling the `Eval` function for the other and this quickly exhaust all stack space. 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. 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.

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

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H.

EPSS exploit prediction

EPSS: 0.003 (16.3th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 16.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · 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)

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

github.com/tensorflow/tensorflow/security/advisories/GHSA-cwv3-863g-39vx (Exploit, Patch, Third Party Advisory)
github.com/tensorflow/tensorflow/commit/9c1dc920d8ffb4893d6c9d27d1f039607b326743 (Patch, Third Party Advisory)
github.com/tensorflow/tensorflow/commit/c6173f5fe66cdbab74f4f869311fe6aae2ba35f4 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-29591?: CVE-2021-29591 is a high-severity vulnerability in Google Tensorflow, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 7.3/10. Published 2021-05-14.
How severe is CVE-2021-29591?: High severity. CVSS v3 base score is 7.3 out of 10.
Is CVE-2021-29591 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.