Vulnerability Intelligence Report
Cisco ASA and FTD Denial-of-Service Vulnerability
CVE-2024-20481
A vulnerability in the Remote Access VPN (RAVPN) service of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) of the RAVPN service. This vulnerability is due to resource exhaustion. An attacker could exploit this vulnerability by sending a large number of VPN authentication requests to an affected device. A successful exploit could allow the attacker to exhaust resources, resulting in a DoS of the RAVPN service on the affected device. Depending on the impact of the attack, a reload of the device may be required to restore the RAVPN service. Services that are not related to VPN are not affected. Cisco Talos discussed these attacks in the blog post Large-scale brute-force activity targeting VPNs, SSH services with commonly used login credentials.
CISA KEV
SSVC: Active Exploitation
Automatable
CVSS Base Score
5.8
MEDIUM
Exploitability:3.9
Impact Score:1.5
EPSS Probability:15.95%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-772 ↗Missing Release of Resource after Effective Lifetime
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Cisco | Cisco 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), 9.15.1 (affected), 9.15.1.7 (affected), 9.15.1.10 (affected), 9.15.1.15 (affected), 9.15.1.16 (affected), 9.15.1.17 (affected), 9.15.1.1 (affected), 9.15.1.21 (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), 9.17.1 (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), 9.19.1 (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) |
| Cisco | Cisco Firepower Threat Defense 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), 6.7.0 (affected), 6.7.0.1 (affected), 6.7.0.2 (affected), 6.7.0.3 (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), 7.1.0 (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) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Cisco Systems, Inc. · Hosted Service · USA |
| Reserved | 2023-11-08T15:08:07 |
| Published | 2024-10-23T17:51:38 |
| Last Updated | 2025-10-21T22:55:41 |
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