CVE-2019-1859

What it is

A vulnerability in the Secure Shell (SSH) authentication process of Cisco Small Business Switches software could allow an attacker to bypass client-side certificate authentication and revert to password authentication. The vulnerability exists because OpenSSH mishandles the authentication process. An attacker could exploit this vulnerability by attempting to connect to the device via SSH. A successful exploit could allow the attacker to access the configuration as an administrative user if the default credentials are not changed. There are no workarounds available; however, if client-side certificate authentication is enabled, disable it and use strong password authentication. Client-side certificate authentication is disabled by default.

At a glance

Exploitability

Can be exploited over the network with an admin-level account. High risk of data exposure, data tampering, service disruption.

Exploit odds

0.8% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2019-05-03 17:29 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 02:29 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.8% in the next 30 days (EPSS).
• Severity: 7.2 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2019-05-03 17:29 UTC

Last modified

2026-06-17 02:29 UTC

Exploit probability

0.8% · EPSS, next 30 days

Weakness

CWE-285

Record status

Modified

Affected

• Cisco sg200-50 Firmware < 1.4.10.6
• Cisco sg200-50p Firmware < 1.4.10.6
• Cisco sg200-50fp Firmware < 1.4.10.6
• Cisco sg200-26 Firmware < 1.4.10.6
• Cisco sg200-26p Firmware < 1.4.10.6
• Cisco sg200-26fp Firmware < 1.4.10.6
• Cisco sg200-18 Firmware < 1.4.10.6
• Cisco sg200-10fp Firmware < 1.4.10.6

Attack profile CVSS 3.1 · 7.2

Attack vector

Network

Complexity

Low

Privileges needed

High

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2019-1859.md and follow it. Check whether this project is affected by CVE-2019-1859. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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