CVE-2021-4433

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

1.26% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 67.5% 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

2024-01-18 00:31Z2 YR AGO

Last updated

2024-10-23 18:22Z1 YR AGO

Reserved

2024-01-16

Assigning CNA

VulDB

Record state

PUBLISHED

Severity

Medium (CVSS 5.3)

CNA CVSS vector

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

Weaknesses

• CWE-404Improper Resource Shutdown or ReleaseClass

Data version

5.1

Document digest

dde8f4c4247723951e28636f9d9728ab11603177546c5b6cbee4b27666a22fed

• vuldb.comhttps://vuldb.com/?id.250836vdb-entry
• vuldb.comhttps://vuldb.com/?ctiid.250836signaturepermissions-required
• packetstormsecurity.comhttps://packetstormsecurity.com/files/163138/Sami-HTTP-Server-2.0-Denial-Of-Service.htmlexploit