CVE-2021-21374

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

1.04% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 63.9% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

CVSS:3.1/AV:N/AC:H/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

2021-03-26 21:25Z5 YR AGO

Last updated

2024-08-03 18:09Z2 YR AGO

Reserved

2020-12-22

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

High (CVSS 8.1)

CNA CVSS vector

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

Weaknesses

• CWE-348Use of Less Trusted SourceBase
• CWE-349Acceptance of Extraneous Untrusted Data With Trusted DataBase
• CWE-599Missing Validation of OpenSSL CertificateVariant
• CWE-295Improper Certificate ValidationBase

Data version

5.1

Document digest

9c47599d71303a26fe20dda0b62325551a6f5fc03be223d9c2ecb2f10b5aa549

• consensys.nethttps://consensys.net/diligence/vulnerabilities/nim-insecure-ssl-tls-defaults-remote-code-execution/x_refsource_MISC
• github.comhttps://github.com/nim-lang/nimble/blob/master/changelog.markdown#0130x_refsource_MISC
• github.comhttps://github.com/nim-lang/security/security/advisories/GHSA-c2wm-v66h-xhxxx_refsource_CONFIRM
• github.comhttps://github.com/nim-lang/Nim/pull/16940x_refsource_MISC