The CCITTFax decoding filter in Ghostscript 8.60, 8.61, and possibly other versions, allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a crafted PDF file that triggers a buffer underflow in the cf_decode_2d function.
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.