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CVE-2026-20073

Severity CVSS v4.0:
Pending analysis
Type:
CWE-284 Improper Access Control
Publication date:
04/03/2026
Last modified:
04/05/2026

Description

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.<br /> <br /> 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.

Impact

Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N CVSS v3.1 Severity and Metrics:

Base Score: 5.80 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Changed
Confidentiality (C): None
Integrity (I): Low
Availability (A): None

Base Score 3.x
5.80
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.1.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.1.3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.2.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.2.4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.2.5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.2.9:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.3.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.3.7:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.3.9:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.3.12:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.2:*:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools