SSH up to 1.2.31 SSH-1 Protocol cryptographic issue

CVSS Meta Temp Score
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CTI Interest Score
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7.0$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in SSH up to 1.2.31. The impacted element is an unknown function of the component SSH-1 Protocol Handler. Performing a manipulation results in cryptographic issue. This vulnerability was named CVE-2001-1473. There is no available exploit. This vulnerability has a historic impact because of its background and how it was received. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in SSH up to 1.2.31 (SSH Server Software). This affects an unknown functionality of the component SSH-1 Protocol Handler. The manipulation with an unknown input leads to a cryptographic issue vulnerability. CWE is classifying the issue as CWE-310. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

The SSH-1 protocol allows remote servers to conduct man-in-the-middle attacks and replay a client challenge response to a target server by creating a Session ID that matches the Session ID of the target, but which uses a public key pair that is weaker than the target s public key, which allows the attacker to compute the corresponding private key and use the target s Session ID with the compromised key pair to masquerade as the target.

The weakness was presented 01/18/2001 as confirmed advisory (CERT.org). The advisory is shared at kb.cert.org. This vulnerability is uniquely identified as CVE-2001-1473 since 04/21/2005. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/25/2025). MITRE ATT&CK project uses the attack technique T1600 for this issue. Due to its background and reception, this vulnerability has a historic impact.

The vulnerability scanner Nessus provides a plugin with the ID 10882 (SSH Protocol Version 1 Session Key Retrieval), which helps to determine the existence of the flaw in a target environment. It is assigned to the family General and running in the context r. The commercial vulnerability scanner Qualys is able to test this issue with plugin 38304 (SSH Protocol Version 1 Supported).

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at X-Force (6603), Tenable (10882), SecurityFocus (BID 2344†) and Vulnerability Center (SBV-1151†). See VDB-16846 for similar entry. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
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: Cryptographic issue
CWE: CWE-310
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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Nessus ID: 10882
Nessus Name: SSH Protocol Version 1 Session Key Retrieval
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 801993
OpenVAS Name: SSH SSH-1 Protocol Authentication Bypass Vulnerability
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

01/18/2001 🔍
01/18/2001 +0 days 🔍
01/18/2002 +365 days 🔍
03/06/2002 +47 days 🔍
05/05/2003 +425 days 🔍
04/21/2005 +717 days 🔍
07/02/2014 +3359 days 🔍
09/25/2025 +4103 days 🔍

Sourcesinfo

Advisory: kb.cert.org
Status: Confirmed

CVE: CVE-2001-1473 (🔍)
GCVE (CVE): GCVE-0-2001-1473
GCVE (VulDB): GCVE-100-16353
CERT: 🔍
X-Force: 6603
SecurityFocus: 2344
Vulnerability Center: 1151 - SSH Protocol Version 1 is Supported, Medium

See also: 🔍

Entryinfo

Created: 07/03/2014 00:57
Updated: 09/25/2025 03:18
Changes: 07/03/2014 00:57 (67), 05/09/2019 19:00 (2), 11/17/2024 05:59 (17), 09/25/2025 03:18 (2)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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