CVE-2021-29613Public exploit

Heap disclosure and process crash via malformed tensors

Published May 14, 2021 · Updated Aug 3, 2024

Out-of-bounds access in affected Google TensorFlow releases allows local users to read heap data or crash a process via malformed CTCLoss tensors. The CTCLoss kernel in ctc_loss_op.cc accepts a zero max_time or a labels_indices tensor with an empty second dimension, then indexes or dereferences invalid state. Triggering requires the ability to invoke the operation with attacker-chosen tensor shapes and values; bounded outcomes are heap disclosure, heap buffer overflow, and process termination.

CVSS severity7.1
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in affected Google TensorFlow releases allows local users to read heap data or crash a process via malformed CTCLoss tensors. The CTCLoss kernel in ctc_loss_op.cc accepts a zero max_time or a labels_indices tensor with an empty second dimension, then indexes or dereferences invalid state. Triggering requires the ability to invoke the operation with attacker-chosen tensor shapes and values; bounded outcomes are heap disclosure, heap buffer overflow, and process termination.

The record

CVE
CVE-2021-29613
Published
May 14, 2021
Updated
Aug 3, 2024
Vendor
Google
Product
TensorFlow
Classifications
CWE-665, CWE-125, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 14, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=< 2.1.4
  2. Affected versionversion=>= 2.2.0, < 2.2.3
  3. Affected versionversion=>= 2.3.0, < 2.3.3
  4. Affected versionversion=>= 2.4.0, < 2.4.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Google · TensorFlowversion=< 2.1.4; version=>= 2.2.0, < 2.2.3; version=>= 2.3.0, < 2.3.3; version=>= 2.4.0, < 2.4.2

Published CVSS scores

7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
3.6NIST NVDAV:L/AC:L/Au:N/C:P/I:N/A:P
6.3GitHub, Inc.CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/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.

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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-665Improper Initialization
CWE-125Out-of-bounds Read
T1499.004Application or System Exploitation

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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