CVE intelligence and bounded remediation

CVE-2026-20073 — Cisco Adaptive Security Appliance Software security vulnerability

Medium CVSS 5.8

A vulnerability in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to send traffic that should be denied through an affected device. This vulnerability is due to improper error handling when an affected device that is joining a cluster runs out of memory while replicating access control rules. An attacker could exploit this vulnerability by sending traffic that should be blocked through the device. A successful exploit could allow the attacker to bypass access controls and reach devices in protected networks.

Severity
Medium
CVSS
5.8 (3.1)
Published
2026-03-04
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-284

Affected products

  • cisco / adaptive_security_appliance_software / 9.12.1
  • cisco / adaptive_security_appliance_software / 9.12.1.2
  • cisco / adaptive_security_appliance_software / 9.12.1.3
  • cisco / adaptive_security_appliance_software / 9.12.2
  • cisco / adaptive_security_appliance_software / 9.12.2.1
  • cisco / adaptive_security_appliance_software / 9.12.2.4

Showing 6 representative product identities from 232 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Authorization bypass, IDOR, and cross-tenant access

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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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