The remote host is missing an update to asterisk announced via advisory DSA 2460-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%202460-1

Several vulnerabilities were discovered in the Asterisk PBX and telephony toolkit: CVE-2012-1183 Russell Bryant discovered a buffer overflow in the Milliwatt application. CVE-2012-2414 David Woolley discovered a privilege escalation in the Asterisk manager interface. CVE-2012-2415 Russell Bryant discovered a buffer overflow in the Skinny driver. For the stable distribution (squeeze), this problem has been fixed in version 1:1.6.2.9-2+squeeze5. For the unstable distribution (sid), this problem will be fixed soon. We recommend that you upgrade your asterisk packages.