A heap buffer underflow in smtp_ungetc() has been found in Exim before version 4.94.2.
A heap buffer underflow in smtp_ungetc() has been found in Exim before version 4.94.2.
https://www.openwall.com/lists/oss-security/2021/05/04/6 https://www.qualys.com/2021/05/04/21nails/21nails.txt