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Vulnerabilities

Vulnerability · CVE-2001-0507

Microsoft IIS 5.0 System file listing Privilege Escalation

Published Jan 5, 2021 · catalog updated Jan 5, 2021 · Microsoft Microsoft Internet Information Server (IIS)

Patch now

CVE-2001-0507 is in the CISA known-exploited catalog. Confirm Microsoft Microsoft Internet Information Server (IIS) against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
Unknown—
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
8.85%
Remediation
Remediation guidance
Affected products
vendor Microsoft Microsoft Internet Information Server (IIS)

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Microsoft Microsoft Internet Information Server (IIS)version unspecified

How to fix CVE-2001-0507

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2001-0507 is in the CISA known-exploited catalog. Confirm Microsoft Microsoft Internet Information Server (IIS) against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

No weakness class is stored. EPSS 8.85%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jan 5, 2021 · VulnCheck KEV

    Detected

    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.

  2. Jan 5, 2021 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

Sources

  • CVE.orgVulnerability recordCVE-2001-0507

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2001-0507

    30-day exploitation probability 8.8%

    first.org
  • VulnCheck KEVConfirmed exploitationCVE-2001-0507

    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.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.