CVE-2021-33824

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

1.93% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 78.3% 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

2021-06-18 19:08Z5 YR AGO

Last updated

2024-08-03 23:58Z2 YR AGO

Reserved

2021-06-03

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-400Uncontrolled Resource ConsumptionClass

Data version

5.1

Document digest

0a54f3068d3c05e3bd5077f4343bfdfb06bcf62545164b2c8db81c6512901b7c

• github.comhttps://github.com/shekyan/slowhttptestx_refsource_MISC
• www.moxa.comhttps://www.moxa.com/en/products/industrial-edge-connectivity/protocol-gateways/modbus-tcp-gateways/mgate-mb3180-mb3280-mb3480-seriesx_refsource_MISC
• github.comhttps://github.com/Jian-Xian/CVE-POC/blob/master/CVE-2021-33824.mdx_refsource_MISC