Rack is a modular Ruby web server interface. Carefully crafted Range headers can cause a server to respond with an unexpectedly large response. Responding with such large responses could lead to a denial of service issue. Vulnerable applications will use the Rack::File middleware or the Rack::Utils.byte_ranges methods (this includes Rails applications). The vulnerability is fixed in 3.0.9.1 and 2.2.8.1.
Exploitability
AV:NAC:LPR:NUI:NScope
S:CImpact
C:NI:NA:L5.8/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:LResource Management