The BAT! mail client allows remote attackers to bypass user warnings of an executable attachment and execute arbitrary commands via an attachment whose file name contains many spaces, which also causes the BAT! to misrepresent the attachment's type with a different icon.

Rit Research Labs The Bat! 1.51 for Windows allows a remote attacker to cause a denial of service by sending an email to a user's account containing a carriage return <CR> that is not followed by a line feed <LF>.

Directory traversal vulnerability in Rit Research Labs The Bat! 1.48f and earlier allows a remote attacker to create arbitrary files via a "dot dot" attack in the filename for an attachment.

The Bat! 1.53d and 1.54beta, and possibly other versions, allows remote attackers to cause a denial of service (crash) via an attachment whose name includes an MS-DOS device name.

Rit Research Labs The Bat! 1.0.11 through 2.0 creates new accounts with insecure ACLs, which allows local users to read other users' email messages.

RITLabs The Bat! before 3.0.0.15 displays certain important headers from encapsulated data in message/partial MIME messages, instead of the real headers, which is in violation of RFC2046 header merging rules and allows remote attackers to spoof the origin of e-mail by sending a fragmented message, as demonstrated using spoofed Received: and Message-ID: headers.

Buffer overflow in RITLabs The Bat! 3.60.07 allows remote attackers to execute arbitrary code via a long Subject field.

The S/MIME specification allows a Cipher Block Chaining (CBC) malleability-gadget attack that can indirectly lead to plaintext exfiltration, aka EFAIL.