Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat...

5.3 / 10

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Description

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.

Basic Information

ID CVE-2025-20219

Source cisco

Published Aug 14, 2025 at 16:28

Modified Aug 14, 2025 at 20:44

Affected Product

Vendor Cisco

Product Cisco Adaptive Security Appliance (ASA) Software

Version 9.18.2

Affected Versions Cisco Cisco Adaptive Security Appliance (ASA) Software 9.18.2
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.18.2.5
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.18.2.7
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.19.1
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.18.2.8
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.18.3
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.19.1.5
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.19.1.9
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.18.3.39
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.19.1.12
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.18.3.46
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.19.1.18
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.18.3.53
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.18.3.55
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.18.3.56
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.20.1
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.19.1.22
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.18.4
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.20.1.5
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.18.4.5
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.19.1.24
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.18.4.8
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.20.2
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.19.1.27
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.18.4.22
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.20.2.10
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.19.1.28
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.18.4.24
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.20.2.21
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.19.1.31
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.18.4.29
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.20.2.22
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.18.4.34
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.20.3
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.18.4.40
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.22.1.1
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.20.3.4
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.18.4.47
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.20.3.7
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.19.1.37
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.20.3.9
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.19.1.38
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.18.4.50
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.22.1.2
Cisco Cisco Firepower Threat Defense Software 7.3.0
Cisco Cisco Firepower Threat Defense Software 7.3.1
Cisco Cisco Firepower Threat Defense Software 7.3.1.1
Cisco Cisco Firepower Threat Defense Software 7.4.0
Cisco Cisco Firepower Threat Defense Software 7.4.1
Cisco Cisco Firepower Threat Defense Software 7.4.1.1
Cisco Cisco Firepower Threat Defense Software 7.3.1.2
Cisco Cisco Firepower Threat Defense Software 7.6.0
Cisco Cisco Firepower Threat Defense Software 7.4.2
Cisco Cisco Firepower Threat Defense Software 7.4.2.1

References

sec.cloudapps.cisco.com /security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ftd-acl-bypass-mtPze9Yh

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    "lastseen": "",
    "description": "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.\r\n\r\nThis 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.",
    "published": "2025-08-14T16:28:40.010Z",
    "modified": "2025-08-14T20:44:27.252Z",
    "type": "cve",
    "title": "Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Access Control Bypass Vulnerability",
    "source": "cisco",
    "references": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ftd-acl-bypass-mtPze9Yh",
    "id": "CVE-2025-20219",
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    "cwe": null,
    "cvelist": null,
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    "sourceHref": "",
    "cvss": {
        "score": 5.3,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
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        "vectorString": "",
        "baseScore": 0,
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        "cvssV3": {
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    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Cisco Adaptive Security Appliance (ASA) Software",
    "version": "9.18.2",
    "vendor": "Cisco",
    "ai_description": "",
    "ai_severity": "",
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    "ai_score": 0
}

Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Access Control Bypass Vulnerability_CVE-2025-20219

Description

Basic Information

Affected Product

References

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