How severe is CVE-2021-40829?

CVE-2021-40829 has a CVSS score of 6.3 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.

Which packages are affected by CVE-2021-40829?

software.amazon.awssdk.iotdevicesdk:aws-iot-device-sdk (maven) versions < 1.4.2; aws-iot-device-sdk-v2 (npm) versions < 1.5.3; awsiotsdk (pip) versions < 1.6.1.

Is there a fix for CVE-2021-40829?

Yes. CVE-2021-40829 is fixed in 1.4.2, 1.5.3, 1.6.1. Upgrade to this version or later.

Is CVE-2021-40829 exploitable, and should I be worried?

Whether CVE-2021-40829 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk.

What actually determines whether CVE-2021-40829 is exploitable, and how bad it is?

Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.

CVE-2021-40829

Q: What is CVE-2021-40829?

CVE-2021-40829 is a high-severity security vulnerability in software.amazon.awssdk.iotdevicesdk:aws-iot-device-sdk (maven), affecting versions < 1.4.2. It is fixed in 1.4.2, 1.5.3, 1.6.1.

Q: Is there a fix for CVE-2021-40829?

Yes. CVE-2021-40829 is fixed in 1.4.2, 1.5.3, 1.6.1. Upgrade to this version or later.

Q: Is CVE-2021-40829 exploitable, and should I be worried?

Whether CVE-2021-40829 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk.

Q: What actually determines whether CVE-2021-40829 is exploitable, and how bad it is?

Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.

Q: How do I fix CVE-2021-40829?

Upgrade: software.amazon.awssdk.iotdevicesdk:aws-iot-device-sdk to 1.4.2 or later, aws-iot-device-sdk-v2 to 1.5.3 or later, awsiotsdk to 1.6.1 or later.

Summary

Improper certificate management in AWS IoT Device SDK v2

Connections initialized by the AWS IoT Device SDK v2 for Java (versions prior to 1.4.2), Python (versions prior to 1.6.1), C++ (versions prior to 1.12.7) and Node.js (versions prior to 1.5.3) did not verify server certificate hostname during TLS handshake when overriding Certificate Authorities (CA) in their trust stores on MacOS. This issue has been addressed in aws-c-io submodule versions 0.10.5 onward. This issue affects: Amazon Web Services AWS IoT Device SDK v2 for Java versions prior to 1.4.2 on macOS. Amazon Web Services AWS IoT Device SDK v2 for Python versions prior to 1.6.1 on macOS. Amazon Web Services AWS IoT Device SDK v2 for C++ versions prior to 1.12.7 on macOS. Amazon Web Services AWS IoT Device SDK v2 for Node.js versions prior to 1.5.3 on macOS. Amazon Web Services AWS-C-IO 0.10.4 on macOS.

Impact

CVE-2021-40829 has a CVSS score of 6.3 (High). The vector is reachable from an adjacent network, high privileges required, and user interaction required. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (1.4.2, 1.5.3, 1.6.1); upgrading removes the vulnerable code path.

Affected versions

software.amazon.awssdk.iotdevicesdk:aws-iot-device-sdk (< 1.4.2) aws-iot-device-sdk-v2 (< 1.5.3) awsiotsdk (< 1.6.1)

Security releases

software.amazon.awssdk.iotdevicesdk:aws-iot-device-sdk → 1.4.2 (maven) aws-iot-device-sdk-v2 → 1.5.3 (npm) awsiotsdk → 1.6.1 (pip)

Kodem intelligence

Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.

Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.

Already deployed Kodem?

See it in your environment New to Kodem? Get a demo →

Remediation advice

Upgrade the following packages to resolve this vulnerability:

software.amazon.awssdk.iotdevicesdk:aws-iot-device-sdk to 1.4.2 or later; aws-iot-device-sdk-v2 to 1.5.3 or later; awsiotsdk to 1.6.1 or later

Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.

Frequently Asked Questions

What is CVE-2021-40829? CVE-2021-40829 is a high-severity security vulnerability in software.amazon.awssdk.iotdevicesdk:aws-iot-device-sdk (maven), affecting versions < 1.4.2. It is fixed in 1.4.2, 1.5.3, 1.6.1.
How severe is CVE-2021-40829? CVE-2021-40829 has a CVSS score of 6.3 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
Which packages are affected by CVE-2021-40829?
- software.amazon.awssdk.iotdevicesdk:aws-iot-device-sdk (maven) (versions < 1.4.2)
- aws-iot-device-sdk-v2 (npm) (versions < 1.5.3)
- awsiotsdk (pip) (versions < 1.6.1)
Is there a fix for CVE-2021-40829? Yes. CVE-2021-40829 is fixed in 1.4.2, 1.5.3, 1.6.1. Upgrade to this version or later.
Is CVE-2021-40829 exploitable, and should I be worried? Whether CVE-2021-40829 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
What actually determines whether CVE-2021-40829 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
How do I fix CVE-2021-40829?
- Upgrade software.amazon.awssdk.iotdevicesdk:aws-iot-device-sdk to 1.4.2 or later
- Upgrade aws-iot-device-sdk-v2 to 1.5.3 or later
- Upgrade awsiotsdk to 1.6.1 or later

Other vulnerabilities in software.amazon.awssdk.iotdevicesdk:aws-iot-device-sdk

CVE-IDSeverityPackage summary

CVE-2021-40830Highsoftware.amazon.awssdk.iotdevicesdk:aws-iot-device-sdk: Improper certificate management in AWS IoT Device SDK v2 CVE-2021-40828Mediumsoftware.amazon.awssdk.iotdevicesdk:aws-iot-device-sdk: Improper certificate management in AWS IoT Device SDK v2 CVE-2021-40831Highsoftware.amazon.awssdk.iotdevicesdk:aws-iot-device-sdk: Improper certificate management in AWS IoT Device SDK v2