When folding a long comment in an email header containing exclusively unfoldable characters, the parenthesis would not be preserved. This could be used for injecting headers into email messages where addresses are user-controlled and not sanitized.
3.10.12-1~22.04.143.12.3-1ubuntu0.113.13.7-1ubuntu0.33.14.0-1ubuntu0.23.6.9-1~18.04ubuntu1.13+esm83.7.5-2ubuntu1~18.04.2+esm93.8.0-3ubuntu1~18.04.2+esm93.8.10-0ubuntu1~20.04.18+esm53.9.5-3ubuntu0~20.04.1+esm93.11.0~rc1-1~22.04.1~esm8Exploitability
AV:NAC:LAT:PPR:HUI:PVulnerable System
VC:NVI:HVA:NSubsequent System
SC:NSI:NSA:NCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N