SSH 2.4 Connection denial of service

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.1$0-$5k0.00

Summaryinfo

A vulnerability was found in SSH 2.4. It has been classified as problematic. The affected element is an unknown function of the component Connection Handler. The manipulation leads to denial of service. This vulnerability is uniquely identified as CVE-2001-0364. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in SSH 2.4 (SSH Server Software). It has been rated as problematic. This issue affects an unknown code block of the component Connection Handler. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is availability. The summary by CVE is:

SSH Communications Security sshd 2.4 for Windows allows remote attackers to create a denial of service via a large number of simultaneous connections.

The bug was discovered 03/16/2001. The weakness was disclosed 06/27/2001 by Martin (Website). It is possible to read the advisory at marc.info. The identification of this vulnerability is CVE-2001-0364. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 103 days. During that time the estimated underground price was around $0-$5k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 38033 (SSH Secure Shell Denial of Service Vulnerability).

Upgrading to version 2.5 eliminates this vulnerability.

The vulnerability is also documented in the databases at X-Force (6241), SecurityFocus (BID 2477†), OSVDB (1773†) and Vulnerability Center (SBV-5966†). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Name

Version

License

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

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: SSH 2.5

Timelineinfo

03/16/2001 🔍
03/16/2001 +0 days 🔍
06/27/2001 +103 days 🔍
06/27/2001 +0 days 🔍
06/27/2001 +0 days 🔍
11/23/2004 +1245 days 🔍
07/04/2014 +3510 days 🔍
10/06/2025 +4112 days 🔍

Sourcesinfo

Advisory: marc.info
Researcher: Martin
Status: Confirmed

CVE: CVE-2001-0364 (🔍)
GCVE (CVE): GCVE-0-2001-0364
GCVE (VulDB): GCVE-100-16847
X-Force: 6241
SecurityFocus: 2477 - SSH Secure Shell Denial of Service Vulnerability
OSVDB: 1773 - CVE-2001-0364 - SSH - Denial of Service Issue
Vulnerability Center: 5966 - DoS in SSH Communications Security via Large Number of Simultaneous Connections, Medium

Entryinfo

Created: 07/04/2014 16:34
Updated: 10/06/2025 15:55
Changes: 07/04/2014 16:34 (60), 06/03/2019 11:08 (3), 10/06/2025 15:55 (20)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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