The expand function in fio.c in Heirloom mailx 12.5 and earlier and BSD mailx 8.1.2 and earlier allows remote attackers to execute arbitrary commands via shell metacharacters in an email address.
                
                    Exploit prediction scoring system (EPSS) score
                    
                        
                            EPSS Score 0.02
                        
                    
                    
                        
                            EPSS Ranking 83.2%