Commercial Internet System vulnerabilitiesRanked by how likely they are to be used.

Product2 versions
The short answer

Commercial Internet System is made by Microsoft. We track 6 published vulnerabilities in it, across 2 versions. None of them is on the list of flaws known to be exploited today. If you run Commercial Internet System, keep it on a version the vendor still supports.

See the riskiest flaws

We keep watching the known-exploited list.

Known exploited

Which Commercial Internet System vulnerabilities are being exploited?

This is the list that matters most: flaws criminals are using now.

None of Commercial Internet System's published vulnerabilities is on the list of flaws known to be exploited today. We keep watching that list.

Exploit likelihood

Which Commercial Internet System flaws are most likely to be used?

Ranked by the latest exploit-likelihood forecast: the chance each flaw is used in an attack in the next 30 days. A high severity score on its own doesn't tell you that. Flaws shared by many other makers' products are left out.

50% or more10% to 49%Under 10%
  1. 80%

    IIS 4.0 and 5.0 does not properly perform ISAPI extension processing if a virtual directory is mapped to a UNC share, which allows remote attackers to read the source code of ASP and other files, aka the "Virtualized...

    CVSS5.0Published30 Mar 2000
  2. 22%

    Denial of service in IIS 4.0 via a flood of HTTP requests with malformed headers.

    CVSS5.0Published11 Aug 1999
  3. 15%

    Microsoft Commercial Internet System (MCIS) IMAP server allows remote attackers to cause a denial of service via a malformed IMAP request.

    CVSS7.5Published4 Jan 2000
  4. 12%

    IIS FTP servers may allow a remote attacker to read or delete files on the server, even if they have "No Access" permissions.

    CVSS7.5Published23 Sep 1999
  5. 5.8%

    Microsoft Site Server and Commercial Internet System (MCIS) do not set an expiration for a cookie, which could then be cached by a proxy and inadvertently used by a different user.

    CVSS5.0Published10 Sep 1999
  6. 3.2%

    Race condition in the SSL ISAPI filter in IIS and other servers may leak information in plaintext.

    CVSS2.6Published11 Aug 1999
Precursor Intelligence

Running Commercial Internet System? We'll keep checking.

Looking flaws up one at a time doesn't scale. Tell us what you run once, and we tell you which flaws matter to you, in what order, and keep watching for new ones.

  1. Tell us what you runPick your software from a list, or let us work it out from your website.
  2. We match it to every flawOver 400,000 published flaws, checked against your list.
  3. Ranked by real-world riskA 0 to 100 score, led by evidence criminals are using it.
  4. Told as soon as we knowAn alert by email, in the app or by webhook to your own tools.

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FAQ

Common questions, answered plainly.

Something else? Talk to the team →

We track 6 published vulnerabilities listed under the name Commercial Internet System, across 2 versions.

None of Commercial Internet System's vulnerabilities is on the list of flaws known to be exploited today.

Create a Precursor Intelligence account and track Commercial Internet System. We match it against every published flaw, give each one a risk score from 0 to 100 and keep watching, so you hear about new ones as soon as we know, by email, in the app or by webhook.