NGINX Plus and NGINX Open Source have a vulnerability in the ngx_mail_smtp_module module due to the improper handling of CRLF sequences in DNS responses. This allows an attacker-controlled DNS server to inject arbitrary headers into SMTP upstream requests, leading to potential request manipulation. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
1.18.0-6ubuntu14.101.24.0-2ubuntu7.71.28.0-6ubuntu1.21.4.6-1ubuntu3.9+esm61.10.3-0ubuntu0.16.04.5+esm71.14.0-0ubuntu1.11+esm21.18.0-0ubuntu1.7+esm1Exploitability
AV:NAC:HAT:PPR:NUI:NVulnerable System
VC:NVI:LVA:NSubsequent System
SC:NSI:NSA:NCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N