CVE-2021-42338: 4mosan Gcb Doctor

Critical severity, CVSS 9.8. EPSS: 5.8% chance of exploitation in the next 30 days.

4MOSAn GCB Doctor’s login page has improper validation of Cookie, which allows an unauthenticated remote attacker to bypass authentication by code injection in cookie, and arbitrarily manipulate the system or interrupt services by upload and execution of arbitrary files.

Affected products

• 4mosan Gcb Doctor: up to and including 20210708

Published 2021-11-19. Last modified 2026-06-17.