UpHeron
All vulnerabilities

Servers and applications

CVE-1999-0253

IIS 3.0 with the iis-fix hotfix installed allows remote intruders to read source code for ASP programs by using a %2e instead of a . (dot) in the URL.

Severity
High 7.5
Published
1 Jan 1997
Last changed
16 Jun 2026
Added to UpHeron
21 Oct 2026
Exploit chance
8% in the next 30 daysHigher than 94% of CVEs. EPSS by FIRST, 12 Nov 2026
Attack
Over the network · No login needed
Attacker can
Read some data · Change some data · Slow it down
CVSS vector
AV:N/AC:L/Au:N/C:P/I:P/A:P
Sources
NVD

Affected software

SoftwareAffected versions
Microsoft IISServers and applications · cpe:a:microsoft:internet_information_services
  • Version 1.0
  • Version 2.0

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-1999-0253
  • CVE.org https://www.cve.org/CVERecord?id=CVE-1999-0253