Clearswift MAILsweeper for SMTP before 4.3.20 and MAILsweeper for Exchange before 4.3.20 allows remote attackers to cause a denial of service via (1) non-ASCII characters in a reverse DNS lookup result from a Received header, which leads to a Receiver service stop, and (2) unspecified vectors involving malformed messages, which causes "unpredictable behavior" that prevents the Security service from processing more messages.
| Software | From | Fixed in |
|---|---|---|
| clearswift / mailsweeper_for_smtp | - | 4.3.19.x |
| clearswift / mailsweeper_for_exchange | - | 4.3.19.x |