CVE intelligence and bounded remediation

CVE-2020-3364 — Cisco Ios Xr security vulnerability

Medium CVSS 5.3

A vulnerability in the access control list (ACL) functionality of the standby route processor management interface of Cisco IOS XR Software could allow an unauthenticated, remote attacker to reach the configured IP addresses on the standby route processor management Gigabit Ethernet Management interface. The vulnerability is due to a logic error that was introduced in the Cisco IOS XR Software, which prevents the ACL from working when applied against the standby route processor management interface. An attacker could exploit this vulnerability by attempting to access the device through the standby route processor management interface.

Severity
Medium
CVSS
5.3 (3.1)
Published
2020-06-18
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-284, CWE-863

Affected products

  • cisco / ios_xr / 6.7.1
  • cisco / ios_xr / 7.0.2
  • cisco / ios_xr / 7.0.11
  • cisco / ios_xr / 7.0.12
  • cisco / ios_xr / 7.1.1
  • cisco / ios_xr / 7.1.15

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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