Vulnerability Intelligence Report
Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Buffer Overflow Vulnerability
CVE-2025-20333
A vulnerability in the VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, remote attacker to execute arbitrary code on an affected device. This vulnerability is due to improper validation of user-supplied input in HTTP(S) requests. An attacker with valid VPN user credentials could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute arbitrary code as root, possibly resulting in the complete compromise of the affected device.
CISA KEV
SSVC: Active Exploitation
CVSS Base Score
9.9
CRITICAL
Exploitability:3.2
Impact Score:6.1
EPSS Probability:40.39%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-120 ↗Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Cisco | Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | 9.8.1 (affected), 9.8.1.5 (affected), 9.8.1.7 (affected), 9.8.2 (affected), 9.8.2.8 (affected), 9.8.2.14 (affected), 9.8.2.15 (affected), 9.8.2.17 (affected), 9.8.2.20 (affected), 9.8.2.24 (affected), 9.8.2.26 (affected), 9.8.2.28 (affected), 9.8.2.33 (affected), 9.8.2.35 (affected), 9.8.2.38 (affected), 9.8.3.8 (affected), 9.8.3.11 (affected), 9.8.3.14 (affected), 9.8.3.16 (affected), 9.8.3.18 (affected), 9.8.3.21 (affected), 9.8.3 (affected), 9.8.3.26 (affected), 9.8.3.29 (affected), 9.8.4 (affected), 9.8.4.3 (affected), 9.8.4.7 (affected), 9.8.4.8 (affected), 9.8.4.10 (affected), 9.8.4.12 (affected), 9.8.4.15 (affected), 9.8.4.17 (affected), 9.8.2.45 (affected), 9.8.4.25 (affected), 9.8.4.20 (affected), 9.8.4.22 (affected), 9.8.4.26 (affected), 9.8.4.29 (affected), 9.8.4.32 (affected), 9.8.4.33 (affected), 9.8.4.34 (affected), 9.8.4.35 (affected), 9.8.4.39 (affected), 9.8.4.40 (affected), 9.8.4.41 (affected), 9.8.4.43 (affected), 9.8.4.44 (affected), 9.8.4.45 (affected), 9.8.4.46 (affected), 9.8.4.48 (affected), 9.12.1 (affected), 9.12.1.2 (affected), 9.12.1.3 (affected), 9.12.2 (affected), 9.12.2.4 (affected), 9.12.2.5 (affected), 9.12.2.9 (affected), 9.12.3 (affected), 9.12.3.2 (affected), 9.12.3.7 (affected), 9.12.4 (affected), 9.12.3.12 (affected), 9.12.3.9 (affected), 9.12.2.1 (affected), 9.12.4.2 (affected), 9.12.4.4 (affected), 9.12.4.7 (affected), 9.12.4.10 (affected), 9.12.4.13 (affected), 9.12.4.8 (affected), 9.12.4.18 (affected), 9.12.4.24 (affected), 9.12.4.26 (affected), 9.12.4.29 (affected), 9.12.4.30 (affected), 9.12.4.35 (affected), 9.12.4.37 (affected), 9.12.4.38 (affected), 9.12.4.39 (affected), 9.12.4.40 (affected), 9.12.4.41 (affected), 9.12.4.47 (affected), 9.12.4.48 (affected), 9.12.4.50 (affected), 9.12.4.52 (affected), 9.12.4.54 (affected), 9.12.4.55 (affected), 9.12.4.56 (affected), 9.12.4.58 (affected), 9.12.4.62 (affected), 9.12.4.65 (affected), 9.12.4.67 (affected), 9.14.1 (affected), 9.14.1.10 (affected), 9.14.1.6 (affected), 9.14.1.15 (affected), 9.14.1.19 (affected), 9.14.1.30 (affected), 9.14.2 (affected), 9.14.2.4 (affected), 9.14.2.8 (affected), 9.14.2.13 (affected), 9.14.2.15 (affected), 9.14.3 (affected), 9.14.3.1 (affected), 9.14.3.9 (affected), 9.14.3.11 (affected), 9.14.3.13 (affected), 9.14.3.18 (affected), 9.14.3.15 (affected), 9.14.4 (affected), 9.14.4.6 (affected), 9.14.4.7 (affected), 9.14.4.12 (affected), 9.14.4.13 (affected), 9.14.4.14 (affected), 9.14.4.15 (affected), 9.14.4.17 (affected), 9.14.4.22 (affected), 9.14.4.23 (affected), 9.14.4.24 (affected), 9.16.1 (affected), 9.16.1.28 (affected), 9.16.2 (affected), 9.16.2.3 (affected), 9.16.2.7 (affected), 9.16.2.11 (affected), 9.16.2.13 (affected), 9.16.2.14 (affected), 9.16.3 (affected), 9.16.3.3 (affected), 9.16.3.14 (affected), 9.16.3.15 (affected), 9.16.3.19 (affected), 9.16.3.23 (affected), 9.16.4 (affected), 9.16.4.9 (affected), 9.16.4.14 (affected), 9.16.4.18 (affected), 9.16.4.19 (affected), 9.16.4.27 (affected), 9.16.4.38 (affected), 9.16.4.39 (affected), 9.16.4.42 (affected), 9.16.4.48 (affected), 9.16.4.55 (affected), 9.16.4.57 (affected), 9.16.4.61 (affected), 9.16.4.62 (affected), 9.16.4.67 (affected), 9.16.4.70 (affected), 9.16.4.71 (affected), 9.16.4.76 (affected), 9.16.4.82 (affected), 9.16.4.84 (affected), 9.17.1 (affected), 9.17.1.7 (affected), 9.17.1.9 (affected), 9.17.1.10 (affected), 9.17.1.11 (affected), 9.17.1.13 (affected), 9.17.1.15 (affected), 9.17.1.20 (affected), 9.17.1.30 (affected), 9.17.1.33 (affected), 9.17.1.39 (affected), 9.18.1 (affected), 9.18.1.3 (affected), 9.18.2 (affected), 9.18.2.5 (affected), 9.18.2.7 (affected), 9.18.2.8 (affected), 9.18.3 (affected), 9.18.3.39 (affected), 9.18.3.46 (affected), 9.18.3.53 (affected), 9.18.3.55 (affected), 9.18.3.56 (affected), 9.18.4 (affected), 9.18.4.5 (affected), 9.18.4.8 (affected), 9.18.4.22 (affected), 9.18.4.24 (affected), 9.18.4.29 (affected), 9.18.4.34 (affected), 9.18.4.40 (affected), 9.19.1 (affected), 9.19.1.5 (affected), 9.19.1.9 (affected), 9.19.1.12 (affected), 9.19.1.18 (affected), 9.19.1.22 (affected), 9.19.1.24 (affected), 9.19.1.27 (affected), 9.19.1.28 (affected), 9.19.1.31 (affected), 9.20.1 (affected), 9.20.1.5 (affected), 9.20.2 (affected), 9.20.2.10 (affected), 9.20.2.21 (affected), 9.20.2.22 (affected), 9.20.3 (affected), 9.20.3.4 (affected), 9.22.1.1 (affected), 9.22.1.2 (affected) |
| Cisco | Cisco Secure Firewall Threat Defense (FTD) Software | 6.2.3 (affected), 6.2.3.1 (affected), 6.2.3.2 (affected), 6.2.3.3 (affected), 6.2.3.4 (affected), 6.2.3.5 (affected), 6.2.3.6 (affected), 6.2.3.7 (affected), 6.2.3.8 (affected), 6.2.3.10 (affected), 6.2.3.11 (affected), 6.2.3.9 (affected), 6.2.3.12 (affected), 6.2.3.13 (affected), 6.2.3.14 (affected), 6.2.3.15 (affected), 6.2.3.16 (affected), 6.2.3.17 (affected), 6.2.3.18 (affected), 6.6.0 (affected), 6.6.0.1 (affected), 6.6.1 (affected), 6.6.3 (affected), 6.6.4 (affected), 6.6.5 (affected), 6.6.5.1 (affected), 6.6.5.2 (affected), 6.6.7 (affected), 6.6.7.1 (affected), 6.6.7.2 (affected), 6.4.0 (affected), 6.4.0.1 (affected), 6.4.0.3 (affected), 6.4.0.2 (affected), 6.4.0.4 (affected), 6.4.0.5 (affected), 6.4.0.6 (affected), 6.4.0.7 (affected), 6.4.0.8 (affected), 6.4.0.9 (affected), 6.4.0.10 (affected), 6.4.0.11 (affected), 6.4.0.12 (affected), 6.4.0.13 (affected), 6.4.0.14 (affected), 6.4.0.15 (affected), 6.4.0.16 (affected), 6.4.0.17 (affected), 6.4.0.18 (affected), 7.0.0 (affected), 7.0.0.1 (affected), 7.0.1 (affected), 7.0.1.1 (affected), 7.0.2 (affected), 7.0.2.1 (affected), 7.0.3 (affected), 7.0.4 (affected), 7.0.5 (affected), 7.0.6 (affected), 7.0.6.1 (affected), 7.0.6.2 (affected), 7.0.6.3 (affected), 7.0.7 (affected), 7.0.8 (affected), 7.1.0 (affected), 7.1.0.1 (affected), 7.1.0.2 (affected), 7.1.0.3 (affected), 7.2.0 (affected), 7.2.0.1 (affected), 7.2.1 (affected), 7.2.2 (affected), 7.2.3 (affected), 7.2.4 (affected), 7.2.4.1 (affected), 7.2.5 (affected), 7.2.5.1 (affected), 7.2.6 (affected), 7.2.7 (affected), 7.2.5.2 (affected), 7.2.8 (affected), 7.2.8.1 (affected), 7.3.0 (affected), 7.3.1 (affected), 7.3.1.1 (affected), 7.3.1.2 (affected), 7.4.0 (affected), 7.4.1 (affected), 7.4.1.1 (affected), 7.4.2 (affected), 7.4.2.1 (affected), 7.4.2.2 (affected), 7.4.2.3 (affected), 7.6.0 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Cisco Systems, Inc. · Hosted Service · USA |
| Reserved | 2024-10-10T19:15:13 |
| Published | 2025-09-25T16:12:14 |
| Last Updated | 2026-02-26T17:47:58 |
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