CVE intelligence and bounded remediation

CVE-2019-1859 — Cisco Sg200-50 Firmware security vulnerability

High CVSS 7.2

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.

Severity
High
CVSS
7.2 (3.1)
Published
2019-05-03
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-285, CWE-295

Affected products

  • cisco / sg200-50_firmware
  • cisco / sg200-50p_firmware
  • cisco / sg200-50fp_firmware
  • cisco / sg200-26_firmware
  • cisco / sg200-26p_firmware
  • cisco / sg200-26fp_firmware

Showing 6 representative product identities from 114 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Authorization bypass, IDOR, and cross-tenant access

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Map object and action authorization checks across API, UI, batch, import/export, and background-job paths.
  • Identify tenant, ownership, role, and policy boundaries for affected resources and administrative operations.
  • Use synthetic fixtures to compare intended access matrices without accessing another user's real data.

Remediate safely

  • Enforce server-side authorization at each resource access and state transition using the authenticated principal and trusted tenant context.
  • Scope data queries by tenant and ownership; treat client-supplied identifiers, roles, and policy claims as untrusted.
  • Add deny-by-default policy tests for horizontal and vertical access across every affected transport.

Authoritative sources

Complete CVE record and remediation plan

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