IIS 5.0 uses relative paths to find system files that will run in-process, which allows local users to gain privileges via a Trojan horse file, aka the "System file listing privilege elevation" vulnerability.
AV:L/AC:L/Au:N/C:C/I:C/A:C
This vulnerability has a 8.85% probability of being exploited in the next 30 days, ranking higher than 95% of all scored CVEs.