Apache HTTP Server up to 1.3.19 on Win/OS2 HTTP Request null pointer dereference

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.1	$0-$5k	0.00

Summaryinfo

A vulnerability labeled as problematic has been found in Apache HTTP Server up to 1.3.19 on Win/OS2. This affects an unknown function of the component HTTP Request Handler. Executing a manipulation with the input <url>///////// can lead to null pointer dereference. The identification of this vulnerability is CVE-2001-1342. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Apache HTTP Server up to 1.3.19 on Win/OS2 (Web Server). It has been declared as problematic. This vulnerability affects an unknown part of the component HTTP Request Handler. The manipulation with the input value <url>///////// leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability. CVE summarizes:

Apache before 1.3.20 on Windows and OS/2 systems allows remote attackers to cause a denial of service (GPF) via an HTTP request for a URI that contains a large number of / (slash) or other characters, which causes certain functions to dereference a null pointer.

The weakness was shared 05/12/2001 by Auriemma Luigi as not defined posting (Bugtraq). The advisory is shared for download at online.securityfocus.com. This vulnerability was named CVE-2001-1342. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available.

The commercial vulnerability scanner Qualys is able to test this issue with plugin 86144 (Apache Web Server HTTP Request Denial of Service Vulnerability).

Upgrading to version 1.3.20 eliminates this vulnerability.

The vulnerability is also documented in the databases at X-Force (6527), SecurityFocus (BID 2740†) and Vulnerability Center (SBV-3614†). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Web Server

Vendor

• Apache

Name

• HTTP Server

Version

• 1.3.0
• 1.3.1
• 1.3.2
• 1.3.3
• 1.3.4
• 1.3.5
• 1.3.6
• 1.3.7
• 1.3.8
• 1.3.9
• 1.3.10
• 1.3.11
• 1.3.12
• 1.3.13
• 1.3.14
• 1.3.15
• 1.3.16
• 1.3.17
• 1.3.18
• 1.3.19

License

• open-source

Support

• end of life (old version)

Website

• Vendor: https://www.apache.org/

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: HTTP Server 1.3.20
McAfee IPS: 🔍
McAfee IPS Version: 🔍

Timelineinfo

04/12/2001 🔍
05/12/2001 +30 days 🔍
05/12/2001 +0 days 🔍
05/12/2001 +0 days 🔍
01/28/2004 +991 days 🔍
07/04/2014 +3810 days 🔍
09/26/2025 +4102 days 🔍

Sourcesinfo

Vendor: apache.org

Advisory: online.securityfocus.com⛔
Researcher: Auriemma Luigi
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2001-1342 (🔍)
GCVE (CVE): GCVE-0-2001-1342
GCVE (VulDB): GCVE-100-16684
X-Force: 6527 - Apache Web Server for Windows and OS2 denial of service
SecurityFocus: 2740 - Apache Web Server HTTP Request Denial of Service Vulnerability
Vulnerability Center: 3614 - DoS in Apache <1.3.20 on Windows and OS/2 Systems via a Large Number of / (slash) Characters, High

Entryinfo

Created: 07/04/2014 11:00
Updated: 09/26/2025 09:29
Changes: 07/04/2014 11:00 (62), 05/19/2019 14:46 (6), 09/26/2025 09:29 (20)
Complete: 🔍
Cache ID: 216:D12:103

Once again VulDB remains the best source for vulnerability data.

Discussion

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