How severe is CVE-2001-0333?

No CVSS score has been assigned to CVE-2001-0333 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2001-0333?

Affected package information for CVE-2001-0333 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2001-0333?

No fixed release is recorded for CVE-2001-0333 yet. Track the upstream advisory, and apply the exposure-reduction steps below in the meantime.

How do I detect CVE-2001-0333 in my code and dependencies?

Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).

How do I mitigate CVE-2001-0333 if there is no patch (or I can't update yet)?

Resolve every user-supplied path to its canonical form and reject anything that escapes the intended directory, and run the component under an account that has no read or write access outside the directory it legitimately serves.

Is CVE-2001-0333 actively exploited in the wild?

Yes. There are 10 known exploit references for CVE-2001-0333, including 9 documented proof-of-concept exploits on Exploit-DB and 1 in-the-wild exploitation observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2001-0333?

CVE-2001-0333 has an EPSS (Exploit Prediction Scoring System) score of 90.8%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

When was CVE-2001-0333 published, and has it been updated?

CVE-2001-0333 was published on September 18, 2001 and was last updated on August 8, 2024. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

Not in CISA KEV

CVE-2001-0333 — Microsoft

CVE-2001-0333 is a security vulnerability. 10 public exploit references exist, so weaponization risk is real. No vendor fix is recorded yet; mitigation options are listed below.

Directory traversal vulnerability in IIS 5.0 and earlier allows remote attackers to execute arbitrary commands by encoding .. (dot dot) and "\" characters twice.

Published

Sep 18, 2001

Updated

Aug 8, 2024

Affected

1 product

Patched

See advisory

Exploits

10 known

Exploitation data as of Oct 27, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

90.8%probability of exploitation in next 30 days

Very High Risk0.00%

Lower risk than most CVEs100th percentile — riskier than 100% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Description

Directory traversal vulnerability in IIS 5.0 and earlier allows remote attackers to execute arbitrary commands by encoding .. (dot dot) and "" characters twice.

Affected Products

1 product · 2 configurations

Application

internet information servermicrosoft

≤ 5.0

1 version

4.0

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-20835remotewindows✓ Verified

Microsoft IIS 3.0/4.0/5.0 - PWS Escaped Characters Decoding Command Execution (1)

by Filip Maertens · May 15, 2001

Exploit-DB Source

EDB-20839remotewindows✓ Verified

Microsoft IIS 3.0/4.0/5.0 - PWS Escaped Characters Decoding Command Execution (5)

by Leif Jakob · May 15, 2001

Exploit-DB Source

EDB-20842remotewindows✓ Verified

Microsoft IIS 3.0/4.0/5.0 - PWS Escaped Characters Decoding Command Execution (8)

by Roelof · May 15, 2001

Exploit-DB Source

EDB-20837remotewindows✓ Verified

Microsoft IIS 3.0/4.0/5.0 - PWS Escaped Characters Decoding Command Execution (3)

by Cyrus The Gerat · May 15, 2001

Exploit-DB Source

EDB-16467remotewindows✓ Verified

Microsoft IIS/PWS - CGI Filename Double Decode Command Execution (MS01-026) (Metasploit)

by Metasploit · Jan 8, 2011

Exploit-DB Source

EDB-20838remotewindows✓ Verified

Microsoft IIS 3.0/4.0/5.0 - PWS Escaped Characters Decoding Command Execution (4)

by MovAX · May 15, 2001

Exploit-DB Source

EDB-20840remotewindows✓ Verified

Microsoft IIS 3.0/4.0/5.0 - PWS Escaped Characters Decoding Command Execution (6)

by A.Ramos · May 15, 2001

Exploit-DB Source

EDB-20841remotewindows✓ Verified

Microsoft IIS 3.0/4.0/5.0 - PWS Escaped Characters Decoding Command Execution (7)

by Gary O'Leary-Steele · May 15, 2001

Exploit-DB Source

EDB-20836remotewindows✓ Verified

Microsoft IIS 3.0/4.0/5.0 - PWS Escaped Characters Decoding Command Execution (2)

by HuXfLuX · May 16, 2001

Exploit-DB Source

Detection & mitigation playbook

Vulnerability

Detect
Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).
Remediation status
No fixed release is recorded for CVE-2001-0333 yet. Track the upstream advisory, and apply the exposure-reduction steps below in the meantime.
Mitigate without a patch
Resolve every user-supplied path to its canonical form and reject anything that escapes the intended directory, and run the component under an account that has no read or write access outside the directory it legitimately serves.

Frequently Asked Questions

Directory traversal vulnerability in IIS 5.0 and earlier allows remote attackers to execute arbitrary commands by encoding .. (dot dot) and "\" characters twice.

O3 Security · Impact-Aware SCA

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CVE-2001-0333 — Microsoft

EPSS Exploitation Probability

Description

Affected Products

Detection & mitigation playbook

Detect

Remediation status

Mitigate without a patch

Frequently Asked Questions

Is CVE-2001-0333 in your dependencies?