CVE-2023-3959: Zavio b8220 Firmware

Critical severity, CVSS 9.8. EPSS: 48.8% chance of exploitation in the next 30 days.

Zavio CF7500, CF7300, CF7201, CF7501, CB3211, CB3212, CB5220, CB6231, B8520, B8220, and CD321 IP Cameras with firmware version M2.1.6.05 are vulnerable to multiple instances of stack-based overflows. While processing XML elements from incoming network requests, the product does not sufficiently check or validate allocated buffer size. This may lead to remote code execution.

Affected products

• Zavio b8220 Firmware: version m2.1.6.05 only
• Zavio b8520 Firmware: version m2.1.6.05 only
• Zavio CB3211 Firmware: version m2.1.6.05 only
• Zavio CB3212 Firmware: version m2.1.6.05 only
• Zavio CB5220 Firmware: version m2.1.6.05 only
• Zavio CB6231 Firmware: version m2.1.6.05 only
• Zavio CD321 Firmware: version m2.1.6.05 only
• Zavio CF7201 Firmware: version m2.1.6.05 only
• Zavio CF7300 Firmware: version m2.1.6.05 only
• Zavio CF7500 Firmware: version m2.1.6.05 only
• Zavio CF7501 Firmware: version m2.1.6.05 only

Published 2023-11-08. Last modified 2026-06-17.