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Vulnerability record · CVE-2001-1473 · published 18 January 2001

CVE-2001-1473: Ssh vulnerability

Ssh · Ssh

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.

7.5 CVSS 2.0 High EPSS 6.3% · top 6.7% CWE-310 · CWE-310
7.5CVSS 2.0 base score
6.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
16 Jun 2026Last modified by NVD

Description

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.kb.cert.org/vuls/id/684820 US Government Resource
https://exchange.xforce.ibmcloud.com/vulnerabilities/6603
http://www.kb.cert.org/vuls/id/684820 US Government Resource
https://exchange.xforce.ibmcloud.com/vulnerabilities/6603

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2001-0144Openbsd openssh vulnerabilityCORE SDI SSH1 CRC-32 compensation attack detector allows remote attackers to execute arbitrary commands on an SSH server or client via an integer ove…EPSS 32%10.0CVE-1999-0248Ssh vulnerabilityA race condition in the authentication agent mechanism of sshd 1.2.17 allows an attacker to steal another user's credentials.EPSS 1.6%8.4CVE-1999-0013Ssh insufficiently protected credentials vulnerabilityStolen credentials from SSH clients via ssh-agent program, allowing other local users to access remote accounts belonging to the ssh-agent user.EPSS 1.1%7.8CVE-2011-0766Erlang crypto vulnerabilityThe random number generator in the Crypto application before 2.0.2.2, and SSH before 2.0.5, as used in the Erlang/OTP ssh library before R14B03, uses…EPSS 3.1%7.5CVE-2001-0572Openbsd openssh vulnerabilityThe SSH protocols 1 and 2 (aka SSH-2) as implemented in OpenSSH and other packages have various weaknesses which can allow a remote attacker to obtai…EPSS 7.1%7.5CVE-2001-0471Ssh vulnerabilitySSH daemon version 1 (aka SSHD-1 or SSH-1) 1.2.30 and earlier does not log repeated login attempts, which could allow remote attackers to compromise …EPSS 5.6%7.5CVE-2001-1475Ssh vulnerabilitySSH before 2.0, when using RC4 and password authentication, allows remote attackers to replay messages until a new server key (VK) is generated.EPSS 1.5%7.5CVE-2001-1476Ssh vulnerabilitySSH before 2.0, with RC4 encryption and the "disallow NULL passwords" option enabled, makes it easier for remote attackers to guess portions of user …EPSS 1.0%

Source: NIST National Vulnerability Database (record CVE-2001-1473), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.