CVE-2021-3990

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

0.89% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 59.2% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

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

2021-12-01 10:50Z4 YR AGO

Last updated

2024-08-03 17:16Z2 YR AGO

Reserved

2021-11-20

Assigning CNA

@huntrdev

Record state

PUBLISHED

Severity

Medium (CVSS 6.5)

CNA CVSS vector

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L

Weaknesses

• CWE-338Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)Base

Data version

5.1

Document digest

162f1baef723e205354b0619a9021222d546a0fcf43039aba2a66a445e8971f3

• huntr.devhttps://huntr.dev/bounties/0680067d-56a7-4412-b06e-a267e850ae9fx_refsource_CONFIRM
• github.comhttps://github.com/star7th/showdoc/commit/a9886f26c08225e0adca75c67dfca3f7c42b87d0x_refsource_MISC