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No exploitation reported

CVE-2021-33820

No exploitation reported by the sources we read.

  • Published2021-06-18

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

An issue was discovered in UniFi Protect G3 FLEX Camera Version UVC.v4.30.0.67.Attacker could send a huge amount of TCP SYN packet to make web service's resource exhausted. Then the web server is denial-of-service.

Timeline

dates in UTC
  1. 2021-06-1819:15CVE publishedNVD

Versions per branch

NVD
Ui camera g3 flex firmwareversion to verify
BranchAffectedFixed in
—= uvc.v4.30.0.67no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2021-06-18
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-8vw7-3cp3-ph8j

Frequently asked questions

What is CVE-2021-33820?

An issue was discovered in UniFi Protect G3 FLEX Camera Version UVC.v4.30.0.67.Attacker could send a huge amount of TCP SYN packet to make web service's resource exhausted. Then the web server is denial-of-service.

Is CVE-2021-33820 actively exploited?

Active exploitation of CVE-2021-33820 has not been confirmed. Its EPSS score was 1.9% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-33820?

CVE-2021-33820 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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Sources for this record