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CVE-2024-20481

Cisco ASA and FTD Denial-of-Service Vulnerability

  • Medium 5.8
  • Exploited: added to CISA KEV 24 Oct 2024

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.

Key facts

Published
23 Oct 2024
Last changed
21 Oct 2025
Assigned by
cisco
KEV added
24 Oct 2024
KEV fix due
14 Nov 2024
EPSS
15.885% likely to be exploited in the next 30 days, higher than 96.942% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: yes; Technical impact: partial

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 5.8CVSS 3.1, Mediumfrom the CNA (cisco)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L

What to do

  • Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
CiscoCisco 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)
CiscoCisco 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)

Timeline

  1. 23 Oct 2024 Published
  2. 24 Oct 2024 CVE-2024-20481 added to CISA KEV
  3. 24 Oct 2024 Added to the CISA KEV catalogue

Weakness

References