CVE-2021-41225

Local service interruption via uninitialized Grappler pointer

Published Nov 5, 2021 · Updated Aug 4, 2024

A use of uninitialized resource in Google TensorFlow before 2.4.4, 2.5.0 through 2.5.1, or 2.6.0 allows local users to cause service interruption via Grappler. When an optimized saved model has no Dequeue node, Grappler leaves dequeue_node uninitialized and then tests the indeterminate pointer. The attacker must run TensorFlow locally and supply a model that reaches this optimizer path; the bounded consequence is process instability or interruption, with no evidence of remote access.

CVSS severity5.5
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A use of uninitialized resource in Google TensorFlow before 2.4.4, 2.5.0 through 2.5.1, or 2.6.0 allows local users to cause service interruption via Grappler. When an optimized saved model has no Dequeue node, Grappler leaves dequeue_node uninitialized and then tests the indeterminate pointer. The attacker must run TensorFlow locally and supply a model that reaches this optimizer path; the bounded consequence is process instability or interruption, with no evidence of remote access.

The record

CVE
CVE-2021-41225
Published
Nov 5, 2021
Updated
Aug 4, 2024
Vendor
Google
Product
TensorFlow
Classifications
CWE-908, T1499
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

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.0NVDAV:L/AC:L/Au:N/C:N/I:N/A:P

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-908Use of Uninitialized Resource
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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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