--- title: "CVE-2024-20481: Cisco Adaptive Security Appliance (ASA)… | CubePath" description: "A vulnerability in the Remote Access VPN (RAVPN) service of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD)…" language: en source: https://cubepath.com/security/cve/CVE-2024-20481 --- # CVE-2024-20481: Cisco Adaptive Security Appliance (ASA)… | CubePath ## Description 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. Official description from the CVE record, published by cisco. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2024-20481) ## Key data ### CVSS 3.1 Medium 5.8 Score published by cisco in the CVE record. CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L | Metric | Value | What it means | | ---------------------- | ------- | ----------------------------------------------------------------------------------- | | Attack vector | Network | The vulnerable component can be reached over a network, possibly from the Internet. | | Attack complexity | Low | No special conditions are needed. The attack can be repeated at will. | | Privileges required | None | No account or privileges are needed. | | User interaction | None | No action from any user is needed. | | Scope | Changed | The impact can reach other components beyond the vulnerable one. | | Confidentiality impact | None | No effect on the secrecy of data. | | Integrity impact | None | No effect on the trustworthiness of data. | | Availability impact | Low | Limited effect on availability. | CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at [first.org/cvss](https://www.first.org/cvss/) . ### EPSS Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days. Score 0.15885 (15.9% probability) Percentile 96.9% Scores of Nov 10, 2026 Model v2026.06.15 ### CISA Known Exploited Vulnerabilities This CVE is listed in the CISA KEV catalog. Name in the catalog Cisco ASA and FTD Denial-of-Service Vulnerability Added to the catalog Oct 24, 2024 Federal due date Nov 14, 2024 ### CISA assessment as of Oct 25, 2024 Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA. Exploitation Recorded by CISA as active Automatable yes Technical impact partial ### Weakness (CWE) CWE catalog version 5.0. CWE names: Copyright © 2006-2026, The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CWE license. - [CWE-772](https://cwe.mitre.org/data/definitions/772.html) Missing Release of Resource after Effective Lifetime ## Affected products Products listed in the CVE record, as the CNA published them. - Cisco Adaptive Security Appliance (ASA) Software - affected: 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 - and 174 more - Cisco Firepower Threat Defense Software - affected: 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 - and 65 more ## References Links listed in the CVE record. They lead to other sites, which CubePath does not control. - [cisco-sa-asaftd-bf-dos-vDZhLqrW](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-bf-dos-vDZhLqrW) (sec.cloudapps.cisco.com) ## Timeline 1. ID reserved Nov 8, 2023 2. Record published Oct 23, 2024 3. Added to CISA KEV Oct 24, 2024 4. Record last updated Oct 21, 2025 ## Look up another CVE ## About CubePath CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection. [Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection) Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:22 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)