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Vulnerability record · CVE-2001-0080 · published 12 February 2001

CVE-2001-0080: Cisco catalyst 4000 vulnerability

Cisco · Catalyst 4000

Cisco Catalyst 6000, 5000, or 4000 switches allow remote attackers to cause a denial of service by connecting to the SSH service with a non-SSH client, which generates a protocol mismatch error.

5.0 CVSS 2.0 Medium EPSS 8.9% · top 4.9%
5.0CVSS 2.0 base score
8.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
6References
16 Jun 2026Last modified by NVD

Description

Cisco Catalyst 6000, 5000, or 4000 switches allow remote attackers to cause a denial of service by connecting to the SSH service with a non-SSH client, which generates a protocol mismatch error.

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

Affected products

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

References

LinkTags
http://www.cisco.com/warp/public/707/catalyst-ssh-protocolmismatch-pub.shtml PatchVendor Advisory
http://www.securityfocus.com/bid/2117
https://exchange.xforce.ibmcloud.com/vulnerabilities/5760
http://www.cisco.com/warp/public/707/catalyst-ssh-protocolmismatch-pub.shtml PatchVendor Advisory
http://www.securityfocus.com/bid/2117
https://exchange.xforce.ibmcloud.com/vulnerabilities/5760

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Related vulnerabilities

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

7.8CVE-2005-4258Cisco catalyst vulnerabilityUnspecified Cisco Catalyst Switches allow remote attackers to cause a denial of service (device crash) via an IP packet with the same source and dest…EPSS 2.1%6.1CVE-2007-1258Cisco catalyst 6000 vulnerabilityUnspecified vulnerability in Cisco IOS 12.2SXA, SXB, SXD, and SXF; and the MSFC2, MSFC2a and MSFC3 running in Hybrid Mode on Cisco Catalyst 6000, 650…EPSS 1.0%5.0CVE-2004-0551Cisco catos vulnerabilityCisco CatOS 5.x before 5.5(20) through 8.x before 8.2(2) and 8.3(2)GLX, as used in Catalyst switches, allows remote attackers to cause a denial of se…EPSS 3.1%5.0CVE-2001-0895Cisco catalyst 2900xl vulnerabilityMultiple Cisco networking products allow remote attackers to cause a denial of service on the local network via a series of ARP packets sent to the r…EPSS 2.4%

Source: NIST National Vulnerability Database (record CVE-2001-0080), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.