CVE-2021-40829

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

0.38% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 30.5% of scored records. A rank, not a probability.

NVD base score

8.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-11-22 23:41Z4 YR AGO

Last updated

2024-08-04 02:51Z2 YR AGO

Reserved

2021-09-09

Assigning CNA

F-SecureUS

Record state

PUBLISHED

Severity

Medium (CVSS 6.3)

CNA CVSS vector

CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H

Weaknesses

• CWE-295Improper Certificate ValidationBase

Data version

5.1

Document digest

9e1011d823334591430801186194a4a6d9dda952adf7dbbd2ae44a430f30a46a

• github.comhttps://github.com/awslabs/aws-c-io/x_refsource_MISC
• github.comhttps://github.com/aws/aws-iot-device-sdk-cpp-v2x_refsource_MISC
• github.comhttps://github.com/aws/aws-iot-device-sdk-python-v2x_refsource_MISC
• github.comhttps://github.com/aws/aws-iot-device-sdk-java-v2x_refsource_MISC
• github.comhttps://github.com/aws/aws-iot-device-sdk-js-v2x_refsource_MISC