csync2 uses insecure temporary directories when compiled with C99 or later, allowing for TOCTOU style attacks on the temporary directories.
Exploitability
AV:LAC:LAT:NPR:LUI:PVulnerable System
VC:NVI:NVA:HSubsequent System
SC:NSI:NSA:N5.1/CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N