A sequence injection vulnerability exists in Rack <2.0.9.1, <2.1.4.1 and <2.2.3.1 which could allow is a possible shell escape in the Lint and CommonLogger components of Rack.
2.1.4-5ubuntu1.11.5.2-3+deb8u3ubuntu1~esm41.6.4-3ubuntu0.2+esm21.6.4-4ubuntu0.2+esm22.0.7-2ubuntu0.1+esm22.1.4-5ubuntu1+esm2Exploitability
AV:NAC:LPR:NUI:NScope
S:CImpact
C:HI:HA:HCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H