Vulnerability identifier: #VU99328

Vulnerability risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2024-20493

CWE-ID: CWE-772

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 ineffective handling of memory resources during the authentication process within the login authentication functionality of the Remote Access SSL VPN feature. A remote attacker can cause a denial of service condition on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cisco Adaptive Security Appliance (ASA): 6.4.0 - 6.4.0.18, 7.0.0 - 7.0.6.2, 7.2.0 - 7.2.8.1, 7.4.0 - 7.4.2, 6.6.0 - 6.6.7.2, 7.3.0 - 7.3.1.2, 9.16.1 - 9.16.4.62, 9.18.1 - 9.18.4.34, 9.20.1 - 9.20.2.22, 9.12.1 - 9.12.4.67, 9.14.1 - 9.14.4.24, 9.17.1 - 9.17.1.39, 9.19.1 - 9.19.1.31, 6.2.3 - 6.2.3.18, 6.7.0 - 6.7.0.3, 7.1.0 - 7.1.0.3, 9.8.1 - 9.8.4.48, 9.15.1 - 9.15.1.21

Cisco Firepower Threat Defense (FTD): 9.12.4 - 9.12.4.67, 9.16.4 - 9.16.4.62, 9.17.1 - 9.17.1.39, 9.18.4 - 9.18.4.34, 9.19.1 - 9.19.1.31, 9.20.2 - 9.20.2.22, 9.14.4 - 9.14.4.24, 7.2.8 - 7.2.8.1, 7.4.2, 6.4.0 - 6.4.0.18, 7.0.0 - 7.0.6.2, 7.2.5 - 7.2.5.2, 7.4.1 - 7.4.1.1, 6.6.0 - 6.6.7.2, 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, 6.2.3 - 6.2.3.18, 7.1.0 - 7.1.0.3, 7.2.4 - 7.2.4.1, 7.3.0, 9.18.2 - 9.18.2.8, 9.8.4 - 9.8.4.48, 7.2.3, 7.2.2, 9.16.3 - 9.16.3.23, 9.18.1 - 9.18.1.3, 9.16.2 - 9.16.2.14, 9.12.1 - 9.12.1.3, 9.12.2 - 9.12.2.9, 9.12.3 - 9.12.3.12, 9.14.1 - 9.14.1.30, 9.14.2 - 9.14.2.15, 9.14.3 - 9.14.3.18, 9.15.1 - 9.15.1.21, 9.16.1 - 9.16.1.28, 9.8.1 - 9.8.1.7, 9.8.2 - 9.8.2.45, 9.8.3 - 9.8.3.29, 7.2.1, 7.2.0 - 7.2.0.1, 6.7.0 - 6.7.0.3

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External links
http://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-vpn-4gYEWMKg

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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.