CVE-2021-40829 json
TLS hostname validation issues within AWS IoT Device SDKs on macOS
published 2021-11-22 4 y ago modified 2026-06-17 4 mo ago also GHSA-743r-5g92-5vgf , PYSEC-2021-862 , EUVD-2021-0029
- cvss
- 6.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 33%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- maven software.amazon.awssdk.iotdevicesdk:aws-iot-device-sdk 1.4.2
- npm aws-iot-device-sdk-v2 1.5.3
- pypi awsiotsdk 1.6.1
- Amazon Web Services AWS IoT Device SDK v2 for Java 1.4.2
- Amazon Web Services AWS IoT Device SDK v2 for Python 1.6.1
- Amazon Web Services AWS IoT Device SDK v2 for C++ 1.12.7
- Amazon Web Services AWS IoT Device SDK v2 for Node.js 1.5.3
- Amazon Web Services AWS-C-IO 0.10.4
Exploit prediction
0.39% chance of exploitation in the next 30 days, higher than 33% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.3 | CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 8.8 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 5.8 | AV:A/AC:L/Au:N/C:P/I:P/A:P |
| GitHub | 3.1 | 6.3 | CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| maven | software.amazon.awssdk.iotdevicesdk:aws-iot-device-sdk | <1.4.2 |
1.4.2 |
| npm | aws-iot-device-sdk-v2 | <1.5.3 |
1.5.3 |
| pypi | awsiotsdk | <1.6.1 |
1.6.1 |
Affected products
- Amazon Web Services AWS IoT Device SDK v2 for Java
- Amazon Web Services AWS IoT Device SDK v2 for Python
- Amazon Web Services AWS IoT Device SDK v2 for C++
- Amazon Web Services AWS IoT Device SDK v2 for Node.js
- Amazon Web Services AWS-C-IO
Classification
- Weakness
-
- CWE-295 Improper Certificate Validation
References
-
github.com
/awslabs/aws-c-io/
product, web
-
github.com
/aws/aws-iot-device-sdk-cpp-v2
web, product
-
github.com
/aws/aws-iot-device-sdk-python-v2
web, product
-
github.com
/aws/aws-iot-device-sdk-java-v2
web, product
-
github.com
/aws/aws-iot-device-sdk-js-v2
web, product
-
nvd.nist.gov
/vuln/detail/CVE-2021-40829
advisory
-
github.com
/advisories/GHSA-743r-5g92-5vgf
advisory
-
github.com
/aws/aws-iot-device-sdk-java-v2/commits/v1.4.2
web
-
github.com
/awslabs/aws-c-io
web
-
github.com
/pypa/advisory-database/tree/main/vulns/awsiotsdk/PYSEC-2021-862.yaml
web
Sources
- CVE List CVE-2021-40829
- GitHub Advisory GHSA-743r-5g92-5vgf
- NVD CVE-2021-40829
- OSV PYSEC-2021-862
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.