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Medium, CVSS 5.4amended

Improper certificate management in AWS IoT Device SDK v2

CVE-2021-40828GHSA-94jq-q5v2-76wj

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (awsiotsdk 1.5.18; software.amazon.awssdk.iotdevicesdk:aws-iot-device-sdk 1.3.3; aws-iot-device-sdk-v2 1.5.1), 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

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
5.4 · CVSS:4.0/AV:A/AC:L/AT:P/PR:H/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N · score source
EPSS
  • CVE-2021-40828: 0.41% estimated exploitation activity in the next 30 days; percentile 35.36 (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.

Connections initialized by the AWS IoT Device SDK v2 for Java (versions prior to 1.3.3), Python (versions prior to 1.5.18), C++ (versions prior to 1.12.7) and Node.js (versions prior to 1.5.1) did not verify server certificate hostname during TLS handshake when overriding Certificate Authorities (CA) in their trust stores on Windows. This issue has been addressed in aws-c-io submodule versions 0.9.13 onward. This issue affects: Amazon Web Services AWS IoT Device SDK v2 for Java versions prior to 1.3.3 on Microsoft Windows. Amazon Web Services AWS IoT Device SDK v2 for Python versions prior to 1.5.18 on Microsoft Windows. Amazon Web Services AWS IoT Device SDK v2 for C++ versions prior to 1.12.7 on Microsoft Windows. Amazon Web Services AWS IoT Device SDK v2 for Node.js versions prior to 1.5.3 on Microsoft Windows.

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

    Amended from ghsa record GHSA-94jq-q5v2-76wj

  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-94jq-q5v2-76wj

Agent brief

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# Patch Next advisory brief: CVE-2021-40828

Advisory: Improper certificate management in AWS IoT Device SDK v2
IDs: CVE-2021-40828, GHSA-94jq-q5v2-76wj
Record: https://patchnext.com/advisories/cve-2021-40828 (revision 3, source checked 26 Oct 2026, 12:31 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.4)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: awsiotsdk 1.5.18; software.amazon.awssdk.iotdevicesdk:aws-iot-device-sdk 1.3.3; aws-iot-device-sdk-v2 1.5.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI awsiotsdk: affected < 1.5.18; fixed in 1.5.18
- Maven software.amazon.awssdk.iotdevicesdk:aws-iot-device-sdk: affected < 1.3.3; fixed in 1.3.3
- npm aws-iot-device-sdk-v2: affected < 1.5.1; fixed in 1.5.1

## Suggested inspection (read-only)
- `python -m pip show awsiotsdk`: prints the installed version. Run with the environment that serves production active.
- Maven software.amazon.awssdk.iotdevicesdk:aws-iot-device-sdk: check the installed version with your package manager.
- `npm ls aws-iot-device-sdk-v2 --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## 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 awsiotsdk, software.amazon.awssdk.iotdevicesdk:aws-iot-device-sdk, aws-iot-device-sdk-v2.
- 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-94jq-q5v2-76wj (OSV record GHSA-94jq-q5v2-76wj lists affected ranges: Maven software.amazon.awssdk.iotdevicesdk:aws-iot-device-sdk >=0 =0 =0 <1.5.18 (fixed))
- Verified: https://github.com/advisories/GHSA-94jq-q5v2-76wj (GitHub-reviewed advisory GHSA-94jq-q5v2-76wj lists affected ranges: Maven software.amazon.awssdk.iotdevicesdk:aws-iot-device-sdk >=0 =0 =0 <1.5.18)

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