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Servers and applications

CVE-2000-0258

IIS 4.0 and 5.0 allows remote attackers to cause a denial of service by sending many URLs with a large number of escaped characters, aka the "Myriad Escaped Characters" Vulnerability.

Severity
High 7.5
Published
12 Apr 2000
Last changed
16 Jun 2026
Added to UpHeron
21 Oct 2026
Exploit chance
19% in the next 30 daysHigher than 97% of CVEs. EPSS by FIRST, 12 Nov 2026
Weakness
Improper input validation (CWE-20)
Attack
Over the network · No login needed · No user action needed
Attacker can
Take it down
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Sources
NVD

Affected software

SoftwareAffected versions
Microsoft IISServers and applications · cpe:a:microsoft:internet_information_services
  • Version 5.0

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2000-0258
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2000-0258