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Vulnerability record · CVE-2001-1476 · published 18 January 2001

CVE-2001-1476: Ssh vulnerability

Ssh · Ssh

SSH before 2.0, with RC4 encryption and the "disallow NULL passwords" option enabled, makes it easier for remote attackers to guess portions of user passwords by replaying user sessions with certain modifications, which trigger different messages depending on whether the guess is correct or not.

7.5 CVSS 2.0 High EPSS 1.0% · top 38.4%
7.5CVSS 2.0 base score
1.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
16 Jun 2026Last modified by NVD

Description

SSH before 2.0, with RC4 encryption and the "disallow NULL passwords" option enabled, makes it easier for remote attackers to guess portions of user passwords by replaying user sessions with certain modifications, which trigger different messages depending on whether the guess is correct or not.

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/565052 ExploitPatchUS Government Resource
https://exchange.xforce.ibmcloud.com/vulnerabilities/6490
http://www.kb.cert.org/vuls/id/565052 ExploitPatchUS Government Resource
https://exchange.xforce.ibmcloud.com/vulnerabilities/6490

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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-2001-1473Ssh vulnerabilityThe 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…EPSS 6.3%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%

Source: NIST National Vulnerability Database (record CVE-2001-1476), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.