CVE-2021-3909

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

1.51% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 72.7% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

2021-11-11 21:45Z4 YR AGO

Last updated

2024-09-16 23:06Z1 YR AGO

Reserved

2021-10-26

Assigning CNA

cloudflare

Record state

PUBLISHED

Severity

Medium (CVSS 4.4)

CNA CVSS vector

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

Weaknesses

• CWE-400Uncontrolled Resource ConsumptionClass

Data version

5.1

Document digest

8b4bc2af10a6846c1599e1488c3bb62fc9dc8c50c90798248a35505fa77875c5

• github.comhttps://github.com/cloudflare/cfrpki/security/advisories/GHSA-8cvr-4rrf-f244x_refsource_MISC
• www.debian.orgDSA-5033https://www.debian.org/security/2021/dsa-5033vendor-advisoryx_refsource_DEBIAN
• www.debian.orgDSA-5041https://www.debian.org/security/2022/dsa-5041vendor-advisoryx_refsource_DEBIAN