CVE-2021-33820

7.5 highEPSS 1.9%

High (7.5) in ui camera g3 flex firmware. EPSS 1.9% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

7.5 high

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

EPSS: 1.9% chance of exploitation in the next 30 days; higher than 80% of CVEs (scores of 2026-10-31)
Published: 2021-06-18
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

ui:camera_g3_flex_firmware

References

https://github.com/Jian-Xian/CVE-POC/blob/master/CVE-2021-33820.md
https://linuxhint.com/hping3/
https://store.ui.com/collections/unifi-protect-cameras/products/unifi-video-g3-flex-camera
https://github.com/Jian-Xian/CVE-POC/blob/master/CVE-2021-33820.md
https://linuxhint.com/hping3/

Check your stack JSON