CVE-2021-27856: Fatpipeinc IPVPN Firmware

Critical severity, CVSS 9.8. EPSS: 5.5% chance of exploitation in the next 30 days.

FatPipe WARP, IPVPN, and MPVPN software prior to versions 10.1.2r60p91 and 10.2.2r42 includes an account named "cmuser" that has administrative privileges and no password. Older versions of FatPipe software may also be vulnerable. The FatPipe advisory identifier for this vulnerability is FPSA002.

Affected products

• Fatpipeinc IPVPN Firmware: version 5.2.0 only; version 6.1.2 only; version 7.1.2 only; version 9.1.2 only; version 10.1.2 only; version 10.2.2 only
• Fatpipeinc MPVPN Firmware: version 5.2.0 only; version 6.1.2 only; version 7.1.2 only; version 9.1.2 only; version 10.1.2 only; version 10.2.2 only
• Fatpipeinc WARP Firmware: version 5.2.0 only; version 6.1.2 only; version 7.1.2 only; version 9.1.2 only; version 10.1.2 only; version 10.2.2 only

Published 2021-12-15. Last modified 2026-06-17.