CVE-2022-42787: Wut At-Modem-Emulator Firmware

High severity, CVSS 8.8. EPSS: 0.8% chance of exploitation in the next 30 days.

Multiple W&T products of the Comserver Series use a small number space for allocating sessions ids. After login of an user an unathenticated remote attacker can brute force the users session id and get access to his account on the the device. As the user needs to log in for the attack to be successful a user interaction is required.

Affected products

• Wut At-Modem-Emulator Firmware: before 1.48 (fixed in 1.48)
• Wut Com-Server ++ Firmware: before 1.48 (fixed in 1.48)
• Wut Com-Server 20ma Firmware: before 1.48 (fixed in 1.48)
• Wut Com-Server Highspeed 100basefx Firmware: before 1.76 (fixed in 1.76)
• Wut Com-Server Highspeed 100baselx Firmware: before 1.76 (fixed in 1.76)
• Wut Com-Server Highspeed 19" 1port Firmware: before 1.76 (fixed in 1.76)
• Wut Com-Server Highspeed 19" 4port Firmware: before 1.76 (fixed in 1.76)
• Wut Com-Server Highspeed Compact Firmware: before 1.76 (fixed in 1.76)
• Wut Com-Server Highspeed Industry Firmware: before 1.76 (fixed in 1.76)
• Wut Com-Server Highspeed Isolated Firmware: before 1.76 (fixed in 1.76)
• Wut Com-Server Highspeed Lc Firmware: before 1.48 (fixed in 1.48)
• Wut Com-Server Highspeed Oem Firmware: before 1.76 (fixed in 1.76)
• Wut Com-Server Highspeed Office 1port Firmware: before 1.76 (fixed in 1.76)
• Wut Com-Server Highspeed Office 4port Firmware: before 1.76 (fixed in 1.76)
• Wut Com-Server Highspeed Poe 3x Isolated Firmware: before 1.48 (fixed in 1.48)
• Wut Com-Server Highspeed Poe Firmware: before 1.76 (fixed in 1.76)
• Wut Com-Server Highspeed Ul Firmware: before 1.48 (fixed in 1.48)

Published 2022-11-10. Last modified 2026-06-17.