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CVE-2001-1556

18
FAUCET Score

CVE-2001-1556 describes a vulnerability in Apache web server where log files fail to properly filter or quote control characters from client-supplied data. This allows remote attackers to obscure HTTP requests and spoof source IP addresses when logs are viewed with standard UNIX utilities. The vulnerability has a CVSS score of 5.0 (MEDIUM), indicating it can be exploited remotely with low complexity to impact data integrity (I:P). There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.3.0, < 1.3.31CPE matchmatch criteria
cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
>= 2.0.0, < 2.0.49CPE matchmatch criteria
cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

AV:N/AC:L/Au:N/C:N/I:P/A:N

Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
3.56%
Probability of exploitation in next 30 days
EPSS Percentile
88.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0356 is in the 84th percentile among its peer group of 23,705 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2001-1556Low

httpd: log files contain information directly supplied by clients and does not filter or quote control characters

Dec 31, 2001

References

archives.neohapsis.com / archives/bugtraq/2001-10/0231.html
Broken Link
httpd.apache.org / docs/logs.html
Vendor Advisory
iss.net / security_center/static/7363.php
Broken Link