Live › vulnerability › CVE-2024-20481
Go to dashboardCisco ASA and Firepower Threat Defense firewalls have a resource leak that lets an unauthenticated remote attacker crash or deny service to the remote access VPN (RAVPN) service. CISA lists it as actively exploited.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 19:11 UTC, 3h before NVD. All times on this page are UTC.
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) | vendor | – | – |
| cisco secure firewall threat defense | vendor | = 6.2.3 | – |
| cisco secure firewall threat defense | vendor | = 6.2.3.1 | – |
| cisco secure firewall threat defense | vendor | = 6.2.3.2 | – |
| cisco secure firewall threat defense | vendor | = 6.2.3.3 | – |
| cisco secure firewall threat defense | vendor | = 6.2.3.4 | – |
| cisco secure firewall threat defense | vendor | = 6.2.3.5 | – |
| cisco secure firewall threat defense | vendor | = 6.2.3.6 | – |
| cisco secure firewall threat defense | vendor | = 6.2.3.7 | – |
| cisco secure firewall threat defense | vendor | = 6.2.3.8 | – |
| cisco secure firewall threat defense | vendor | = 6.2.3.9 | – |
| cisco secure firewall threat defense | vendor | = 6.2.3.10 | – |
| cisco secure firewall threat defense | vendor | = 6.2.3.11 | – |
| cisco secure firewall threat defense | vendor | = 6.2.3.12 | – |
| cisco secure firewall threat defense | vendor | = 6.2.3.13 | – |
| cisco secure firewall threat defense | vendor | = 6.2.3.14 | – |
| cisco secure firewall threat defense | vendor | = 6.2.3.15 | – |
| cisco secure firewall threat defense | vendor | = 6.2.3.16 | – |
| cisco secure firewall threat defense | vendor | = 6.2.3.17 | – |
| cisco secure firewall threat defense | vendor | = 6.2.3.18 | – |
| cisco secure firewall threat defense | vendor | = 6.4.0 | – |
| cisco secure firewall threat defense | vendor | = 6.4.0.1 | – |
| cisco secure firewall threat defense | vendor | = 6.4.0.2 | – |
| cisco secure firewall threat defense | vendor | = 6.4.0.3 | – |
| cisco secure firewall threat defense | vendor | = 6.4.0.4 | – |
| cisco secure firewall threat defense | vendor | = 6.4.0.5 | – |
| cisco secure firewall threat defense | vendor | = 6.4.0.6 | – |
| cisco secure firewall threat defense | vendor | = 6.4.0.7 | – |
| cisco secure firewall threat defense | vendor | = 6.4.0.8 | – |
| cisco secure firewall threat defense | vendor | = 6.4.0.9 | – |
| cisco secure firewall threat defense | vendor | = 6.4.0.10 | – |
| cisco secure firewall threat defense | vendor | = 6.4.0.11 | – |
| cisco secure firewall threat defense | vendor | = 6.4.0.12 | – |
| cisco secure firewall threat defense | vendor | = 6.4.0.13 | – |
| cisco secure firewall threat defense | vendor | = 6.4.0.14 | – |
| cisco secure firewall threat defense | vendor | = 6.4.0.15 | – |
| cisco secure firewall threat defense | vendor | = 6.4.0.16 | – |
| cisco secure firewall threat defense | vendor | = 6.4.0.17 | – |
| cisco secure firewall threat defense | vendor | = 6.4.0.18 | – |
| cisco secure firewall threat defense | vendor | = 6.6.0 | – |
| cisco secure firewall threat defense | vendor | = 6.6.0.1 | – |
Check whether the device runs remote access VPN (RAVPN) and which ASA or FTD software version it is on; the sources do not give a specific command.
Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
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.
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