Heap-based buffer overflow in Sophos Anti-Virus and Endpoint Security before 6.0.5, Anti-Virus for Linux before 5.0.10, and other platforms before 4.11, when archive scanning is enabled, allows remote attackers to trigger a denial of service (memory corruption) via a CHM file with an LZX decompression header that specifies a Window_size of 0.
Sophos Anti-Virus and Endpoint Security before 6.0.5, Anti-Virus for Linux before 5.0.10, and other platforms before 4.11, when "Enabled scanning of archives" is set, allows remote attackers to cause a denial of service (infinite loop) via a malformed RAR archive with an Archive Header section with the head_size and pack_size fields set to zero.
Sophos Anti-Virus 5.1 allows remote attackers to cause a denial of service (memory consumption) via a file that is compressed with Petite and contains a large number of sections.
Sophos Anti-Virus 5.0.1, with "Scan inside archive files" enabled, allows remote attackers to cause a denial of service (CPU consumption by infinite loop) via a Bzip2 archive with a large 'Extra field length' value.
Sophos PureMessage Scanner service (PMScanner.exe) in PureMessage for Microsoft Exchange 3.0 before 3.0.2 allows remote attackers to cause a denial of service (message queue delay and incomplete spam rule update) via a crafted (1) RTF or (2) PDF file.
The installation of Sophos PureMessage for Microsoft Exchange 3.0 before 3.0.2, when both anti-virus and anti-spam are supported, does not create or launch the associated scan engines when the system is under heavy load, which has unspecified impact, probably remote bypass of scanner protection or a denial of service (message loss or delay).
Sophos PureMessage for Microsoft Exchange 3.0 before 3.0.2 allows remote attackers to cause a denial of service (EdgeTransport.exe termination) via a TNEF-encoded message with a crafted rich text body that is not properly handled during conversion to plain text. NOTE: this might be related to CVE-2008-7104.
Sophos virus detection engine 2.75 on Linux and Unix, as used in Sophos Email Appliance, Pure Message for Unix, and Sophos Anti-Virus Interface (SAVI), allows remote attackers to cause a denial of service (engine crash) via zero-length MIME attachments.