What is CVE-2021-41227?

CVE-2021-41227 is a medium-severity vulnerability in Google Tensorflow, classified under Out-of-bounds Read. CVSS score: 6.6/10. Published 2021-11-05.

How severe is CVE-2021-41227?

Medium severity. CVSS v3 base score is 6.6 out of 10.

Is CVE-2021-41227 known to be exploited?

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

Out-of-bounds Read in Google Tensorflow

CVE-2021-41227

TensorFlow is an open source platform for machine learning. In affected versions the `ImmutableConst` operation in TensorFlow can be tricked into reading arbitrary memory contents. This is because the `tstring` TensorFlow string class has a special case for memory mapped strings but the operation itself does not offer any support for this datatype. The fix will be included in TensorFlow 2.7.0. We will also cherrypick this commit on TensorFlow 2.6.1, TensorFlow 2.5.2, and TensorFlow 2.4.4, as these are also affected and still in supported range.

Vulnerability class: Buffer Overflow

Published 2021-11-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.6 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L.

EPSS exploit prediction

EPSS: 0.002 (13.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 13th percentile — 13.3% 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 — versions 2.7.0
Tensorflow — versions >= 2.6.0, < 2.6.1, >= 2.5.0, < 2.5.2, < 2.4.4

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

Public proof-of-concept exploits

References

github.com/tensorflow/tensorflow/security/advisories/GHSA-j8c8-67vp-6mx7 (Exploit, Patch, Third Party Advisory)
github.com/tensorflow/tensorflow/commit/1cb6bb6c2a6019417c9adaf9e6843ba75ee2580b (Patch, Third Party Advisory)
github.com/tensorflow/tensorflow/commit/3712a2d3455e6ccb924daa5724a3652a86f6b585 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-41227?: CVE-2021-41227 is a medium-severity vulnerability in Google Tensorflow, classified under Out-of-bounds Read. CVSS score: 6.6/10. Published 2021-11-05.
How severe is CVE-2021-41227?: Medium severity. CVSS v3 base score is 6.6 out of 10.
Is CVE-2021-41227 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.