Clearswift MIMEsweeper for Web before 5.1.15 Hotfix allows remote attackers to cause a denial of service (crash) via an encrypted archived .RAR file, which triggers a scan error and causes the Web Policy Engine service to terminate.
Clearswift MAILsweeper for SMTP before 4.3_13 allows remote attackers to cause a denial of service (infinite loop) via an e-mail with a crafted RAR archive attached.
MAILsweeper for SMTP 3.x does not properly handle corrupt CDA documents in a ZIP file and hangs, which allows remote attackers to cause a denial of service.