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Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Access Control Rules Bypass Vulnerability

cisco-sa-asa-ftd-acl-bypass-mtPze9Yh · Medium · Published · Updated

A vulnerability in the implementation of access control rules for loopback interfaces 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 have been blocked to a loopback interface. This vulnerability is due to improper enforcement of access control rules for loopback interfaces. An attacker could exploit this vulnerability by sending traffic to a loopback interface on an affected device. A successful exploit could allow the attacker to bypass configured access control rules and send traffic that should have been blocked to a loopback interface on the device. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link:https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ftd-acl-bypass-mtPze9Yh This advisory is part of the August 2025 release of the Cisco Secure Firewall ASA, Secure FMC, and Secure FTD Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: August 2025 Semiannual Cisco Secure Firewall ASA, Secure FMC, and Secure FTD Software Security Advisory Bundled Publication.

Cisco advisory ·CSAF JSON

Workarounds

There are no workarounds that address this vulnerability.

CVEsCVE-2025-20219
Cisco Bug IDsCSCwi57783, CSCwn19639
CVSS ScoreBase 5.3
Base 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:X/RL:X/RC:X
Product Names From Source
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.2, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.2.5, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.2.7, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.2.8, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.3, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.3.39, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.3.46, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.3.53, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.3.55, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.3.56, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4.5, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4.8, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4.22, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4.24, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4.29, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4.34, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4.40, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4.47, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4.50, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1.5, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1.9, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1.12, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1.18, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1.22, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1.24, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1.27, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1.28, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1.31, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1.37, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1.38, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.1, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.1.5, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.2, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.2.10, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.2.21, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.2.22, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.3, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.3.4, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.3.7, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.3.9, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.22.1.1, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.22.1.2, Cisco Secure Firewall Threat Defense (FTD) Software 7.3.0, Cisco Secure Firewall Threat Defense (FTD) Software 7.3.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.3.1.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.3.1.2, Cisco Secure Firewall Threat Defense (FTD) Software 7.4.0, Cisco Secure Firewall Threat Defense (FTD) Software 7.4.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.4.1.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.4.2, Cisco Secure Firewall Threat Defense (FTD) Software 7.4.2.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.6.0, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software, Cisco Secure Firewall Threat Defense (FTD) Software, Cisco Firepower 2100 Series, Cisco Firepower 1000 Series, Cisco 3000 Series Industrial Security Appliances (ISA), Cisco Firepower 9000 Series, Cisco Firepower 4100 Series, Cisco Adaptive Security Virtual Appliance (ASAv), Cisco Secure Firewall 3100 Series, Cisco Secure Firewall 4200 Series, Cisco Secure Firewall 1200 Series, Cisco Secure Firewall Threat Defense Virtual

CSAF Product Statuses

Product Status Source CVE Rows
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.2 when installed on Cisco 3000 Series Industrial Security Appliances (ISA) known_affected cisco_csaf CVE-2025-20219 1
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.2 when installed on Cisco Adaptive Security Virtual Appliance (ASAv) known_affected cisco_csaf CVE-2025-20219 1
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.2 when installed on Cisco Firepower 1000 Series known_affected cisco_csaf CVE-2025-20219 1
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.2 when installed on Cisco Firepower 2100 Series known_affected cisco_csaf CVE-2025-20219 1
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.2 when installed on Cisco Firepower 4100 Series known_affected cisco_csaf CVE-2025-20219 1
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.2 when installed on Cisco Firepower 9000 Series known_affected cisco_csaf CVE-2025-20219 1
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.2 when installed on Cisco Secure Firewall 3100 Series known_affected cisco_csaf CVE-2025-20219 1
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.2.5 when installed on Cisco 3000 Series Industrial Security Appliances (ISA) known_affected cisco_csaf CVE-2025-20219 1
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.2.5 when installed on Cisco Adaptive Security Virtual Appliance (ASAv) known_affected cisco_csaf CVE-2025-20219 1
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.2.5 when installed on Cisco Firepower 1000 Series known_affected cisco_csaf CVE-2025-20219 1
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.2.5 when installed on Cisco Firepower 2100 Series known_affected cisco_csaf CVE-2025-20219 1
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.2.5 when installed on Cisco Firepower 4100 Series known_affected cisco_csaf CVE-2025-20219 1

Showing 12 of 358 CSAF status groups; 346 more not shown.

Related Products

Product CVE Evidence
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software CVE-2025-20219 Cisco OpenVuln
Cisco Secure Firewall Threat Defense (FTD) Software CVE-2025-20219 Cisco OpenVuln
Cisco Firepower 2100 Series CVE-2025-20219 Cisco OpenVuln · family-level
Cisco Firepower 1000 Series CVE-2025-20219 Cisco OpenVuln · family-level
Cisco 3000 Series Industrial Security Appliances (ISA) CVE-2025-20219 Cisco OpenVuln · family-level
Cisco Firepower 9000 Series CVE-2025-20219 Cisco OpenVuln · family-level
Cisco Firepower 4100 Series CVE-2025-20219 Cisco OpenVuln · family-level
Cisco Adaptive Security Virtual Appliance (ASAv) CVE-2025-20219 Cisco OpenVuln
Cisco Secure Firewall 3100 Series CVE-2025-20219 Cisco OpenVuln · family-level
Cisco Secure Firewall 4200 Series CVE-2025-20219 Cisco OpenVuln · family-level
Cisco Secure Firewall 1200 Series CVE-2025-20219 Cisco OpenVuln · family-level
Cisco Secure Firewall Threat Defense Virtual CVE-2025-20219 Cisco OpenVuln
Cisco Adaptive Security Appliance (ASA) Software CVE-2025-20219 Cisco OpenVuln
Cisco Firepower Threat Defense Software CVE-2025-20219 Cisco OpenVuln
Cisco 3000 Series Routers CVE-2025-20219 Cisco OpenVuln