Improper access control in Cisco Adaptive Security Appliance Software
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-284.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Cisco | Cisco Adaptive Security Appliance (ASA) Software | 9.18.2; 9.18.2.5; 9.18.2.7; 9.19.1; 9.18.2.8; 9.18.3; 9.19.1.5; 9.19.1.9; 9.18.3.39; 9.19.1.12; 9.18.3.46; 9.19.1.18; 9.18.3.53; 9.18.3.55; 9.18.3.56; 9.20.1; 9.19.1.22; 9.18.4; 9.20.1.5; 9.18.4.5; 9.19.1.24; 9.18.4.8; 9.20.2; 9.19.1.27; 9.18.4.22; 9.20.2.10; 9.19.1.28; 9.18.4.24; 9.20.2.21; 9.19.1.31; 9.18.4.29; 9.20.2.22; 9.18.4.34; 9.20.3; 9.18.4.40; 9.22.1.1; 9.20.3.4; 9.18.4.47; 9.20.3.7; 9.19.1.37; 9.20.3.9; 9.19.1.38; 9.18.4.50; 9.22.1.2 | — | No fix listed | CNA |
| Cisco | Cisco Firepower Threat Defense Software | 7.3.0; 7.3.1; 7.3.1.1; 7.4.0; 7.4.1; 7.4.1.1; 7.3.1.2; 7.6.0; 7.4.2; 7.4.2.1 | — | No fix listed | CNA |
- Cisco Adaptive Security Appliance (ASA) Software VendorCisco Affected 9.18.2; 9.18.2.5; 9.18.2.7; 9.19.1; 9.18.2.8; 9.18.3; 9.19.1.5; 9.19.1.9; 9.18.3.39; 9.19.1.12; 9.18.3.46; 9.19.1.18; 9.18.3.53; 9.18.3.55; 9.18.3.56; 9.20.1; 9.19.1.22; 9.18.4; 9.20.1.5; 9.18.4.5; 9.19.1.24; 9.18.4.8; 9.20.2; 9.19.1.27; 9.18.4.22; 9.20.2.10; 9.19.1.28; 9.18.4.24; 9.20.2.21; 9.19.1.31; 9.18.4.29; 9.20.2.22; 9.18.4.34; 9.20.3; 9.18.4.40; 9.22.1.1; 9.20.3.4; 9.18.4.47; 9.20.3.7; 9.19.1.37; 9.20.3.9; 9.19.1.38; 9.18.4.50; 9.22.1.2 Fixed in — No fix listed CNA
- Cisco Firepower Threat Defense Software VendorCisco Affected 7.3.0; 7.3.1; 7.3.1.1; 7.4.0; 7.4.1; 7.4.1.1; 7.3.1.2; 7.6.0; 7.4.2; 7.4.2.1 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2025-20219
- 2026-10-03 Alias added: GHSA-8x2f-w8fv-gqcm
References
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- TI-2026-16344 Cisco Secure Firewall Management Center Software Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 10.0
Sources
- CVE-2025-20219 · CVE Program
- CVE-2025-20219 · NVD
- FIRST EPSS
- GHSA-8x2f-w8fv-gqcm · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences