CVE-2021-35977: Digi 6350-Sr Firmware

Critical severity, CVSS 9.8. EPSS: 1.6% chance of exploitation in the next 30 days.

An issue was discovered in Digi RealPort for Windows through 4.8.488.0. A buffer overflow exists in the handling of ADDP discovery response messages. This could result in arbitrary code execution.

Affected products

• Digi 6350-Sr Firmware: any version
• Digi Cm Firmware: any version
• Digi Connect Es Firmware: any version
• Digi Connectport LTS 8/16/32 Firmware: any version
• Digi Connectport Ts 8/16 Firmware: any version
• Digi One Ia Firmware: any version
• Digi One Iap Family Firmware: any version
• Digi Passport Integrated Console Server Firmware: any version
• Digi Portserver Ts Firmware: any version
• Digi Portserver Ts M Mei Firmware: any version
• Digi Portserver Ts Mei Firmware: any version
• Digi Portserver Ts Mei Hardened Firmware: any version
• Digi Portserver Ts P Mei Firmware: any version
• Digi Realport: up to and including 1.9-40; up to and including 4.8.488.0
• Digi Transport WR11 Xt Firmware: any version
• Digi WR21 Firmware: any version
• Digi WR31 Firmware: any version
• Digi WR44 R Firmware: any version

Published 2021-10-08. Last modified 2026-06-17.