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7.5High

Microsoft Internet Information Server

CVE-2000-0970

IIS 4.0 and 5.0 .ASP pages send the same Session ID cookie for secure and insecure web sessions, which could allow remote attackers to hijack the secure web session of the user if that user moves to an insecure session, aka the "Session ID Cookie Marking" vulnerability.

What this means for your business

  • It affects Microsoft Internet Information Server. It matters if your company, or a supplier that handles your data, runs it.
  • An attacker can use it remotely, over a network.

What to do

  1. 1Check whether your company or your suppliers run Microsoft Internet Information Server, and which version. The affected versions are listed further down this page.
  2. 2If you do, follow the vendor's guidance. No patch reference has been published yet.

Not sure if your company is exposed?

Fastnexa’s certified penetration testers can check whether attackers could use this flaw, or others like it, against your websites, apps and network. The full test is free for our first 10 founding clients until 31 December 2026.

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Scoring

CVSS
7.5 (v2.0)
Vector
AV:N/AC:L/Au:N/C:P/I:P/A:P
Assigned by
cve@mitre.org

Dates

Published
2000-12-19
Last modified
2026-09-23
Sources
NVD

Affected products

  • Microsoft Internet Information Server4.0
  • Microsoft Internet Information Services5.0

As listed in the NVD configuration data. Not a statement about your estate.

References