CVE Tools
Sign in

CVE-2025-20219

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

Published: Aug 14, 2025Updated: Aug 15, 2025 Sources: CVE List NVD BDUCWE-284
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.4%
Top 72.6%
CISA KEV
Not in KEV
Exploits
0 Known
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-284

Affected Products

Adaptive Security ApplianceCisco Systems Inc.
Network Device
Networking Infrastructure / firewall
Firepower Threat DefenseCisco Systems Inc.
On-premSecurity Product
Networking Infrastructure / firewall
Cisco Adaptive Security Appliance (ASA) SoftwareCisco
On-premSecurity Product
Networking Infrastructure / firewall
Cisco Firepower Threat Defense SoftwareCisco
On-premSecurity Product
Networking Infrastructure / firewall
cisco systems inc.commercialUSNetworking Infrastructureaka cisco systems, cisco
ciscocommercialUSNetworking Infrastructureaka cisco systems, cisco systems inc.

Exploitability

0 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

References

https://www.cve.org/CVERecord?id=CVE-2025-20219
cve.org
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ftd-acl-bypass-mtPze9Yh
sec.cloudapps.cisco.com

Timeline

Published
Aug 14, 2025
Last Updated
Aug 15, 2025

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2025-20219 and every CVE in our database. Create a free account — no credit card required.

Create Free Account
Plain-language analysis
Impact assessment and exploitation scenario in plain English
Attack graph visualization
Interactive attack path and kill chain mapping
Exploit details & PoC links
ExploitDB, Metasploit, GitHub PoCs with direct links
Nuclei scanner templates
Ready-to-use vulnerability scanner templates
Full remediation guide
Patch instructions, workarounds, and compliance impact
Interactive AI chat
Ask questions about this vulnerability in natural language
Related vulnerabilities
Semantically similar CVEs and attack patterns
REST API & MCP access
Integrate vulnerability data into your workflows