What’s Vulnerable › Vulnerabilities

CVE-2021-33820

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-06-18 · updated 2026-06-17

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.

Affected products

• Ui Camera G3 Flex Firmware: uvc.v4.30.0.67

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/
• https://store.ui.com/collections/unifi-protect-cameras/products/unifi-video-g3-flex-camera

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