On 2024-10-24, CISA added CVE-2024-20481 (Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)) to its Known Exploited Vulnerabilities (KEV) catalog [2]. The vulnerability is listed in the catalog as "Cisco ASA and FTD Denial-of-Service Vulnerability" [2]. CISA requires remediation in accordance with the listed vendor mitigation guidance; see the original text in the body for specific requirements [2].
Backfill: this event became public on Oct 24, 2024 and we added it on Nov 10, 2026. It is not a new event.
CISA Adds Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) Vulnerability CVE-2024-20481 to Known Exploited Vulnerabilities Catalog
1 min read
- Disclosed
- Oct 24, 2024
- Published
- Nov 10, 2026
- Last updated
- Nov 8, 2026
- CVSS basis
- Our assessment
- 15.9%, higher than 97% of CVEs
- Exploitation and patch status
- ExploitedKEV
- Attack vector
- Vulnerability status
- Actor type
- Motivation
On this page
30-second summary
What happened
Who is affected
Industries mainly affected: Government, Cross-industry
What to do nowOur advice
CISA requires remediation in accordance with the listed vendor mitigation guidance; see the original text in the body for specific requirements [2].
Timeline
Technical details
CISA KEV Listing Record
CISA added CVE-2024-20481 (Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)) to the Known Exploited Vulnerabilities () catalog on 2024-10-24 [2].
Original Technical Description
Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) contain a missing release of resource after effective lifetime vulnerability that could allow an unauthenticated, remote attacker to cause a denial-of-service (DoS) of the RAVPN service. [2]
Official Required Action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. [2]
Individual Vulnerability Record
The U.S. National Vulnerability Database (NVD) provides an independent vulnerability record and description for CVE-2024-20481 [1].
References
Official / primary3
- [1]
“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 reso”
- [2]
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