Vulnerability Intelligence Report
Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Remote Access SSL VPN Denial of Service Vulnerability
CVE-2025-20243
A vulnerability in the management and VPN web servers of Cisco Secure Firewall ASA Software and Secure FTD Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a DoS condition. This vulnerability is due to improper validation of user-supplied input on an interface with VPN web services. An attacker could exploit this vulnerability by sending crafted HTTP requests to a targeted web server on an affected device. A successful exploit could allow the attacker to cause a DoS condition when the device reloads.
No Active Exploit Signals
CVSS Base Score
8.6
HIGH
Exploitability:3.9
Impact Score:4.0
EPSS Probability:0.55%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-835 ↗Loop with Unreachable Exit Condition ('Infinite Loop')
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Cisco | Cisco Adaptive Security Appliance (ASA) Software | 9.12.3 (affected), 9.8.3 (affected), 9.12.1 (affected), 9.8.1 (affected), 9.12.2 (affected), 9.8.2.45 (affected), 9.8.2 (affected), 9.8.4 (affected), 9.14.1 (affected), 9.12.4 (affected), 9.8.2.26 (affected), 9.8.2.24 (affected), 9.8.2.15 (affected), 9.8.2.14 (affected), 9.8.2.35 (affected), 9.8.2.20 (affected), 9.8.2.8 (affected), 9.8.2.17 (affected), 9.8.2.28 (affected), 9.8.2.33 (affected), 9.8.2.38 (affected), 9.8.4.25 (affected), 9.12.3.2 (affected), 9.12.3.7 (affected), 9.8.3.18 (affected), 9.8.3.14 (affected), 9.8.4.15 (affected), 9.8.4.8 (affected), 9.8.1.7 (affected), 9.8.3.29 (affected), 9.14.1.10 (affected), 9.12.2.5 (affected), 9.8.4.22 (affected), 9.12.3.12 (affected), 9.8.4.7 (affected), 9.8.4.17 (affected), 9.8.3.16 (affected), 9.8.4.20 (affected), 9.8.3.11 (affected), 9.12.1.3 (affected), 9.8.4.3 (affected), 9.12.2.4 (affected), 9.8.4.12 (affected), 9.12.1.2 (affected), 9.8.3.26 (affected), 9.8.1.5 (affected), 9.12.2.9 (affected), 9.12.3.9 (affected), 9.8.3.21 (affected), 9.8.4.10 (affected), 9.12.2.1 (affected), 9.12.4.2 (affected), 9.14.1.6 (affected), 9.8.3.8 (affected), 9.14.1.15 (affected), 9.14.1.19 (affected), 9.8.4.26 (affected), 9.12.4.4 (affected), 9.14.1.30 (affected), 9.8.4.29 (affected), 9.12.4.7 (affected), 9.14.2 (affected), 9.12.4.8 (affected), 9.8.4.32 (affected), 9.12.4.10 (affected), 9.14.2.4 (affected), 9.14.2.8 (affected), 9.12.4.13 (affected), 9.8.4.33 (affected), 9.14.2.13 (affected), 9.8.4.34 (affected), 9.12.4.18 (affected), 9.8.4.35 (affected), 9.14.2.15 (affected), 9.12.4.24 (affected), 9.16.1 (affected), 9.8.4.39 (affected), 9.14.3 (affected), 9.12.4.26 (affected), 9.16.1.28 (affected), 9.14.3.1 (affected), 9.12.4.29 (affected), 9.14.3.9 (affected), 9.16.2 (affected), 9.12.4.30 (affected), 9.16.2.3 (affected), 9.8.4.40 (affected), 9.14.3.11 (affected), 9.12.4.35 (affected), 9.8.4.41 (affected), 9.14.3.13 (affected), 9.16.2.7 (affected), 9.12.4.37 (affected), 9.14.3.15 (affected), 9.17.1 (affected), 9.16.2.11 (affected), 9.14.3.18 (affected), 9.16.2.13 (affected), 9.12.4.39 (affected), 9.12.4.38 (affected), 9.8.4.43 (affected), 9.14.4 (affected), 9.16.2.14 (affected), 9.17.1.7 (affected), 9.12.4.40 (affected), 9.16.3.3 (affected), 9.14.4.6 (affected), 9.16.3 (affected), 9.16.3.14 (affected), 9.17.1.9 (affected), 9.14.4.7 (affected), 9.12.4.41 (affected), 9.17.1.10 (affected), 9.8.4.44 (affected), 9.18.1 (affected), 9.12.4.47 (affected), 9.14.4.12 (affected), 9.16.3.15 (affected), 9.18.1.3 (affected), 9.17.1.11 (affected), 9.12.4.48 (affected), 9.14.4.13 (affected), 9.18.2 (affected), 9.16.3.19 (affected), 9.17.1.13 (affected), 9.12.4.50 (affected), 9.14.4.14 (affected), 9.17.1.15 (affected), 9.8.4.45 (affected), 9.12.4.52 (affected), 9.14.4.15 (affected), 9.16.3.23 (affected), 9.18.2.5 (affected), 9.16.4 (affected), 9.12.4.54 (affected), 9.14.4.17 (affected), 9.8.4.46 (affected), 9.17.1.20 (affected), 9.18.2.7 (affected), 9.19.1 (affected), 9.16.4.9 (affected), 9.12.4.55 (affected), 9.18.2.8 (affected), 9.14.4.22 (affected), 9.16.4.14 (affected), 9.8.4.48 (affected), 9.18.3 (affected), 9.19.1.5 (affected), 9.14.4.23 (affected), 9.12.4.56 (affected), 9.16.4.18 (affected), 9.17.1.30 (affected), 9.19.1.9 (affected), 9.18.3.39 (affected), 9.16.4.19 (affected), 9.12.4.58 (affected), 9.19.1.12 (affected), 9.18.3.46 (affected), 9.16.4.27 (affected), 9.19.1.18 (affected), 9.18.3.53 (affected), 9.18.3.55 (affected), 9.16.4.38 (affected), 9.17.1.33 (affected), 9.12.4.62 (affected), 9.16.4.39 (affected), 9.18.3.56 (affected), 9.20.1 (affected), 9.16.4.42 (affected), 9.19.1.22 (affected), 9.18.4 (affected), 9.20.1.5 (affected), 9.18.4.5 (affected), 9.19.1.24 (affected), 9.16.4.48 (affected), 9.18.4.8 (affected), 9.20.2 (affected), 9.19.1.27 (affected), 9.12.4.65 (affected), 9.16.4.55 (affected), 9.18.4.22 (affected), 9.20.2.10 (affected), 9.16.4.57 (affected), 9.19.1.28 (affected), 9.17.1.39 (affected), 9.12.4.67 (affected), 9.14.4.24 (affected), 9.18.4.24 (affected), 9.20.2.21 (affected), 9.16.4.61 (affected), 9.19.1.31 (affected), 9.18.4.29 (affected), 9.20.2.22 (affected), 9.16.4.62 (affected), 9.18.4.34 (affected), 9.20.3 (affected), 9.16.4.67 (affected), 9.16.4.70 (affected), 9.18.4.40 (affected), 9.23.1 (affected), 9.22.1.1 (affected), 9.16.4.71 (affected), 9.20.3.4 (affected), 9.18.4.47 (affected), 9.20.3.7 (affected), 9.17.1.45 (affected), 9.19.1.37 (affected), 9.17.1.46 (affected), 9.16.4.76 (affected), 9.20.3.9 (affected), 9.19.1.38 (affected), 9.18.4.50 (affected), 9.22.1.3 (affected), 9.20.3.10 (affected), 9.22.1.2 (affected), 9.18.4.52 (affected), 9.20.3.13 (affected), 9.22.1.6 (affected), 9.18.4.53 (affected), 9.16.4.82 (affected) |
| Cisco | Cisco Firepower Threat Defense Software | 6.2.3.14 (affected), 6.4.0.1 (affected), 6.2.3.7 (affected), 6.2.3 (affected), 6.4.0.2 (affected), 6.2.3.9 (affected), 6.2.3.1 (affected), 6.2.3.2 (affected), 6.4.0.5 (affected), 6.2.3.10 (affected), 6.4.0 (affected), 6.4.0.3 (affected), 6.2.3.6 (affected), 6.4.0.4 (affected), 6.2.3.15 (affected), 6.2.3.5 (affected), 6.2.3.4 (affected), 6.2.3.3 (affected), 6.2.3.8 (affected), 6.4.0.6 (affected), 6.2.3.11 (affected), 6.2.3.12 (affected), 6.2.3.13 (affected), 6.4.0.7 (affected), 6.4.0.8 (affected), 6.6.0 (affected), 6.4.0.9 (affected), 6.2.3.16 (affected), 6.6.0.1 (affected), 6.6.1 (affected), 6.4.0.10 (affected), 6.4.0.11 (affected), 6.6.3 (affected), 6.6.4 (affected), 6.4.0.12 (affected), 7.0.0 (affected), 6.2.3.17 (affected), 7.0.0.1 (affected), 6.6.5 (affected), 7.0.1 (affected), 7.1.0 (affected), 6.4.0.13 (affected), 6.6.5.1 (affected), 6.2.3.18 (affected), 7.0.1.1 (affected), 6.4.0.14 (affected), 7.1.0.1 (affected), 6.6.5.2 (affected), 7.0.2 (affected), 6.4.0.15 (affected), 7.2.0 (affected), 7.0.2.1 (affected), 7.0.3 (affected), 6.6.7 (affected), 7.1.0.2 (affected), 7.2.0.1 (affected), 7.0.4 (affected), 7.2.1 (affected), 7.0.5 (affected), 6.4.0.16 (affected), 7.3.0 (affected), 7.2.2 (affected), 7.2.3 (affected), 6.6.7.1 (affected), 7.3.1 (affected), 7.1.0.3 (affected), 7.2.4 (affected), 7.0.6 (affected), 7.2.5 (affected), 7.2.4.1 (affected), 7.3.1.1 (affected), 7.4.0 (affected), 6.4.0.17 (affected), 7.0.6.1 (affected), 7.2.5.1 (affected), 7.4.1 (affected), 7.2.6 (affected), 7.0.6.2 (affected), 7.4.1.1 (affected), 6.6.7.2 (affected), 6.4.0.18 (affected), 7.2.7 (affected), 7.2.5.2 (affected), 7.3.1.2 (affected), 7.2.8 (affected), 7.6.0 (affected), 7.4.2 (affected), 7.2.8.1 (affected), 7.0.6.3 (affected), 7.4.2.1 (affected), 7.2.9 (affected), 7.0.7 (affected), 7.7.0 (affected), 7.4.2.2 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
0.545%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Cisco Systems, Inc. · Hosted Service · USA |
| Reserved | 2024-10-10T19:15:13 |
| Published | 2025-08-14T16:29:21 |
| Last Updated | 2025-08-14T19:19:56 |
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