The remote host is missing an update to kernel-source-2.4.27 announced via advisory DSA 1237-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201237-1

Several local and remote vulnerabilities have been discovered in the Linux kernel that may lead to a denial of service or the execution of arbitrary code. For details, please visit the referenced security advisories. The following matrix explains which kernel version for which architecture fix the problems mentioned above: Debian 3.1 (sarge) Source 2.4.27-10sarge5 Alpha architecture 2.4.27-10sarge5 ARM architecture 2.4.27-2sarge5 Intel IA-32 architecture 2.4.27-10sarge5 Intel IA-64 architecture 2.4.27-10sarge5 Motorola 680x0 architecture 2.4.27-3sarge5 Big endian MIPS 2.4.27-10.sarge4.040815-2 Little endian MIPS 2.4.27-10.sarge4.040815-2 PowerPC architecture 2.4.27-10sarge5 IBM S/390 architecture 2.4.27-2sarge5 Sun Sparc architecture 2.4.27-9sarge5 The following matrix lists additional packages that were rebuilt for compatibility with or to take advantage of this update: Debian 3.1 (sarge) fai-kernels 1.9.1sarge5 kernel-image-2.4.27-speakup 2.4.27-1.1sarge4 mindi-kernel 2.4.27-2sarge4 systemimager 3.2.3-6sarge4 We recommend that you upgrade your kernel package immediately and reboot