Is CVE-2001-1556 in the CISA KEV catalog?

No. CVE-2001-1556 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2001-1556?

CVE-2001-1556 has a CVSS v2 base score of 5.0 (MEDIUM).

What is the EPSS score for CVE-2001-1556?

CVE-2001-1556 has an EPSS score of 3.56% (88th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2001-1556?

Upgrade httpd to 1.3.31 or later.

CVE & CISA-KEV Catalog

CVE-2001-1556

MEDIUMEPSS 88th pctl

5.0

CVSS v2

NVD

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.

CWE-532

How to fix

Remediation Available

httpdWindows application

Affected:1.3.0 1.3.31Fixed in:1.3.31Apache Lounge

Affected:2.0.0 2.0.49Fixed in:2.0.49Apache Lounge

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

3.56%probability of exploitation in 30 days

88thpercentile

Elevated risk: more likely to be exploited than 88% of all known CVEs.

References

Vendor Advisory1

httpd.apache.org

Other references2

Related Vulnerabilities

Other CWE-532 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-1622	Medium	5.3	79%	-	-
CVE-2020-35234	High	7.5	65%	-	Fix
CVE-2023-43261	High	7.5	59%	-	Fix
CVE-2024-20440	High	7.5	52%	-	-
CVE-2018-3609	High	8.1	22%	-	-
CVE-2018-8719	Medium	5.3	17%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-16.