The remote host is missing an update to screen announced via advisory DSA 1202-1. cstone and Rich Felker discovered that specially crafted UTF-8 sequences may lead an out of bands memory write when displayed inside the screen terminal multiplexer, allowing denial of service and potentially the execution of arbitrary code.
For the stable distribution (sarge) this problem has been fixed in version 4.0.2-4.1sarge1. Due to technical problems with the security buildd infrastructure this update lacks a build for the Sun Sparc architecture. It will be released as soon as the problems are resolved. For the unstable distribution (sid) this problem has been fixed in version 4.0.3-0.1. We recommend that you upgrade your screen package. https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201202-1