Vulnerability identifier: #VU99327

Vulnerability risk: High

CVSSv3.1: 7.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2024-20494

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco Adaptive Security Appliance (ASA)
Hardware solutions / Security hardware applicances
Cisco Firepower Threat Defense (FTD)
Hardware solutions / Security hardware applicances

Vendor: Cisco Systems, Inc

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper data validation during the TLS 1.3 handshake. A remote attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Cisco Adaptive Security Appliance (ASA): 7.2.0 - 7.2.8.1, 7.3.0 - 7.3.1.2, 7.4.0 - 7.4.2, 9.18.1 - 9.18.4.40, 9.20.1 - 9.20.3, 9.19.1 - 9.19.1.31

Cisco Firepower Threat Defense (FTD): 9.18.4 - 9.18.4.40, 9.19.1 - 9.19.1.31, 9.20.2 - 9.20.2.22, 7.2.8 - 7.2.8.1, 7.2.3 - 7.2.3.1, 7.2.5 - 7.2.5.2, 7.4.1 - 7.4.1.1, 7.3.1 - 7.3.1.2, 7.2.6, 7.2.7, 7.4.0, 9.18.3 - 9.18.3.56, 9.20.1 - 9.20.1.5, 7.2.4 - 7.2.4.1, 7.3.0, 9.18.2 - 9.18.2.8, 7.2.2, 9.18.1 - 9.18.1.3, 7.2.1, 7.2.0 - 7.2.0.1, 9.20.3, 7.4.2

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External links
http://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-tls-CWY6zXB

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.