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← Actionable
Low, CVSS 2.0amended

Session operations in eager mode lead to null pointer dereferences

CVE-2021-29518GHSA-62gx-355r-9fhg

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (tensorflow 2.4.2, 2.3.3, 2.2.3, 2.1.4; tensorflow-gpu 2.4.2, 2.3.3, 2.2.3, 2.1.4; tensorflow-cpu 2.4.2, 2.3.3, 2.2.3, 2.1.4), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • PyPI tensorflow

    Affected
    < 2.1.4>= 2.2.0, < 2.2.3>= 2.3.0, < 2.3.3>= 2.4.0, < 2.4.2
    Fixed in
    2.4.2, 2.3.3, 2.2.3, 2.1.4

  • PyPI tensorflow-gpu

    Affected
    < 2.1.4>= 2.2.0, < 2.2.3>= 2.3.0, < 2.3.3>= 2.4.0, < 2.4.2
    Fixed in
    2.4.2, 2.3.3, 2.2.3, 2.1.4

  • PyPI tensorflow-cpu

    Affected
    < 2.1.4>= 2.2.0, < 2.2.3>= 2.3.0, < 2.3.3>= 2.4.0, < 2.4.2
    Fixed in
    2.4.2, 2.3.3, 2.2.3, 2.1.4

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
2.0 · CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N · score source
EPSS
  • CVE-2021-29518: 0.20% estimated exploitation activity in the next 30 days; percentile 10.05 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Impact In eager mode (default in TF 2.0 and later), session operations are invalid. However, users could still call the raw ops associated with them and trigger a null pointer dereference: The implementation dereferences the session state pointer without checking if it is valid: Thus, in eager mode, ctx-sessionstate() is nullptr and the call of the member function is undefined behavior. Patches We have patched the issue in GitHub commit ff70c47a396ef1e3cb73c90513da4f5cb71bebba. 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. For more information Please consult our security guide for more information regarding the security model and how to contact us with issues and questions. Attribution This vulnerability has been reported by members of the Aivul Team from Qihoo 360.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-62gx-355r-9fhg

  2. Revision 2 · amended ·

    Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

  3. Revision 1 · created ·

    Published from osv record GHSA-62gx-355r-9fhg

Agent brief

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# Patch Next advisory brief: CVE-2021-29518

Advisory: Session operations in eager mode lead to null pointer dereferences
IDs: CVE-2021-29518, GHSA-62gx-355r-9fhg
Record: https://patchnext.com/advisories/cve-2021-29518 (revision 3, source checked 26 Oct 2026, 13:25 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Low (CVSS 2.0)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: tensorflow 2.4.2, 2.3.3, 2.2.3, 2.1.4; tensorflow-gpu 2.4.2, 2.3.3, 2.2.3, 2.1.4; tensorflow-cpu 2.4.2, 2.3.3, 2.2.3, 2.1.4. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI tensorflow: affected < 2.1.4; >= 2.2.0, < 2.2.3; >= 2.3.0, < 2.3.3; >= 2.4.0, < 2.4.2; fixed in 2.4.2, 2.3.3, 2.2.3, 2.1.4
- PyPI tensorflow-gpu: affected < 2.1.4; >= 2.2.0, < 2.2.3; >= 2.3.0, < 2.3.3; >= 2.4.0, < 2.4.2; fixed in 2.4.2, 2.3.3, 2.2.3, 2.1.4
- PyPI tensorflow-cpu: affected < 2.1.4; >= 2.2.0, < 2.2.3; >= 2.3.0, < 2.3.3; >= 2.4.0, < 2.4.2; fixed in 2.4.2, 2.3.3, 2.2.3, 2.1.4

## Suggested inspection (read-only)
- `python -m pip show tensorflow`: prints the installed version. Run with the environment that serves production active.
- `python -m pip show tensorflow-gpu`: prints the installed version. Run with the environment that serves production active.
- `python -m pip show tensorflow-cpu`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on tensorflow, tensorflow-gpu, tensorflow-cpu.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-62gx-355r-9fhg (OSV record GHSA-62gx-355r-9fhg lists affected ranges: PyPI tensorflow >=0 =2.2.0 =2.3.0 =2.4.0 =0 =2.2.0 =2.3.0 =2.4.0 =0 =2.2.0 =2.3.0 =2.4.0 <2.4.2 (fixed))
- Verified: https://github.com/advisories/GHSA-62gx-355r-9fhg (GitHub-reviewed advisory GHSA-62gx-355r-9fhg lists affected ranges: PyPI tensorflow >=0 =2.2.0 =2.3.0 =2.4.0 =0 =2.2.0 =2.3.0 =2.4.0 =0 =2.2.0 =2.3.0 =2.4.0 <2.4.2)

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