Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2024-20481
Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)
AV AC PR UI S C I A CVSS EPSS %ile KEV
N L N N C N N L 5.8 .1575 96.8 YES
AFFECTED
Product Versions Fixed
Cisco Adaptive Security Appliance (ASA) Software 9.8.1 – —
Cisco Firepower Threat Defense Software 6.2.3 – —
TIMELINE
Nov 8 Reserved by cisco
Oct 23 Published (CNA: cisco)
Oct 24 Added to CISA KEV, remediation due 2024-11-14
Aug 11 ENRICHED — CVE-2024-20481 (Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)). Received CVSS 5.8 and CPE data from NVD.
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.
Lifecycle
Complete event history — 4 events, chronological
| Date | Event | Detail |
|---|
| November 8, 2023 | Reserved | Reserved by cisco |
| October 23, 2024 | Published | Published (CNA: cisco) |
| October 24, 2024 | KEV ADDED | Added to CISA KEV, remediation due 2024-11-14 |
| August 11, 2026 | ENRICHED | ENRICHED — CVE-2024-20481 (Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)). Received CVSS 5.8 and CPE data from NVD. |
Affected
Affected products and packages — 2 rows
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| Cisco | Cisco Adaptive Security Appliance (ASA) Software | — | 9.8.1 | — |
| Cisco | Cisco Firepower Threat Defense Software | — | 6.2.3 | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2024-20481 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
