CVE-2001-1556

Name: CVE-2001-1556
Creator: NVD / NIST
Published: 2001-12-31T05:00:00+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 3.56%

Last modified Jun 16, 2026

CVE-2001-1556 is a vulnerability of currently unknown severity. The log files in Apache web server contain information directly supplied by clients and does not filter or quote control characters, which could allow remote attackers to hide HTTP requests and spoof source IP addresses when logs are viewed with UNIX programs such as cat, tail, and grep.. EPSS estimates a 3.56% chance of exploitation in the next 30 days.

Description

The log files in Apache web server contain information directly supplied by clients and does not filter or quote control characters, which could allow remote attackers to hide HTTP requests and spoof source IP addresses when logs are viewed with UNIX programs such as cat, tail, and grep.

Metrics

EPSS Probability

3.56%

87.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-532

Affected Software

Vendor	Product	Versions
Apache	Http Server	>= 1.3.0, < 1.3.31
Apache	Http Server	>= 2.0.0, < 2.0.49

References

http://archives.neohapsis.com/archives/bugtraq/2001-10/0231.htmlBroken Link
http://httpd.apache.org/docs/logs.htmlVendor Advisory
http://www.iss.net/security_center/static/7363.phpBroken Link
http://archives.neohapsis.com/archives/bugtraq/2001-10/0231.htmlBroken Link
http://httpd.apache.org/docs/logs.htmlVendor Advisory
http://www.iss.net/security_center/static/7363.phpBroken Link

Timeline

Published: Dec 31, 2001
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2001-1556?

How severe is CVE-2001-1556?

Severity scoring for CVE-2001-1556 is pending analysis. The EPSS model estimates a 3.56% probability of exploitation in the next 30 days.

How do I fix CVE-2001-1556?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2001-1556?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST