Is CVE-2024-20494 being actively exploited?

CVE-2024-20494 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2024-20494?

CVE-2024-20494 has a CVSS 3.1 base score of 8.6 (HIGH).

CVE-2024-20494

HIGH · CVSS 8.6EPSS 0.5%EU EUVD

A vulnerability in the TLS cryptography functionality of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to improper data validation during the TLS 1.3 handshake. An attacker could exploit this vulnerability by sending a crafted TLS 1.3 packet to an affected system through a TLS 1.3-enabled listening socket. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition. Note: This vulnerability can also impact the integrity of a device by causing VPN HostScan communication failures or file transfer failures when Cisco ASA Software is upgraded using Cisco Adaptive Security Device Manager (ASDM).

Key facts

CVSS score: 8.6 (v3.1)
Severity: HIGH
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Weakness (CWE): CWE-1287
EPSS score: 0.5% (43th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2024-18209)
Published: October 23, 2024
NVD last modified: August 11, 2026
Status: Analyzed

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2024-18209 in the EU Vulnerability Database. Last updated in EUVD on October 23, 2024.

View on the EU Vulnerability Database

Affected products

cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / secure firewall threat defense
cisco / secure firewall threat defense
cisco / secure firewall threat defense
cisco / secure firewall threat defense
cisco / secure firewall threat defense
cisco / secure firewall threat defense
cisco / secure firewall threat defense
cisco / secure firewall threat defense

Certified products that may be affected

2 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Cisco Secure Firewall Threat Defense (FTD) 7.4 with Secure Firewall Management Center (FMC) 7.4 and Secure Client 5.1 - Cisco Systems, Inc. - Common Criteria NSCIB-CC-2400046-01-CR - active
Cisco Secure Firewall Threat Defense Virtual 7.4 with FMC/FMCv - Cisco Systems, Inc. - Common Criteria CCEVS-VR-VID-11510-2025 - active

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-tls-CWY6zXB(Mitigation, Vendor Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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