CVE-2021-41206Public exploit

Process crashes and heap access via unchecked shapes

Published Nov 5, 2021 · Updated Aug 4, 2024

Improper tensor-shape validation in Google TensorFlow before 2.4.4, 2.5.0 through 2.5.1, and 2.6.0 allows local users to crash processes. GPU TridiagonalMatMul and several CPU kernels accept incompatible ranks, dimensions, or batch shapes and then index or allocate tensors under invalid assumptions. Local access to invoke affected operations with crafted tensor shapes is required, and outcomes range from CHECK failures and segmentation faults to heap reads and writes.

CVSS severity7.0
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper tensor-shape validation in Google TensorFlow before 2.4.4, 2.5.0 through 2.5.1, and 2.6.0 allows local users to crash processes. GPU TridiagonalMatMul and several CPU kernels accept incompatible ranks, dimensions, or batch shapes and then index or allocate tensors under invalid assumptions. Local access to invoke affected operations with crafted tensor shapes is required, and outcomes range from CHECK failures and segmentation faults to heap reads and writes.

The record

CVE
CVE-2021-41206
Published
Nov 5, 2021
Updated
Aug 4, 2024
Vendor
Google
Product
TensorFlow
Classifications
CWE-354
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 5, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.4.4
  2. Affected versionversion=>= 2.5.0, < 2.5.2
  3. Affected versionversion=>= 2.6.0, < 2.6.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Google · TensorFlowversion=< 2.4.4; version=>= 2.5.0, < 2.5.2; version=>= 2.6.0, < 2.6.1

Published CVSS scores

7.0GitHub, Inc.CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
4.6NIST NVDAV:L/AC:L/Au:N/C:P/I:P/A:P
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-354Improper Validation of Integrity Check Value

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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