bash Shellshock smtp vulnerability CVE-2014-6271 Description   This signature allows you to detect or block attempts of exploiting the bash Shell Shock vulnerability through vulnerable smtp server.       Default configuration   Profiles High Medium Low Internet Action Block Block Block Block Alarm Level Major Major Major Major       References   CVE: CVE-2014-6271 CVE: CVE-2014-7169       Available since   ASQ v5.0.0       Protects   Shell Linux Environment Variables ShellShock Remote Code Execution Vulnerability GNU Bash Environment Variables Function Parsing Two Vulnerabilities GNU Bash Script Parsing Two Vulnerabilities GNU Bash Environment Variables Parsing OS Commands Injection Vulnerability GNU Bash Shell Function Definitions OS Commands Injection Vulnerability 100 last CVE   CVE-2014-7227 CVE-2014-7187 CVE-2014-7186 CVE-2014-7169 CVE-2014-6278 CVE-2014-6277 CVE-2014-6271    Risk level  Critical