#VU82680 Resource exhaustion in Cisco Adaptive Security Appliance (ASA) and Cisco Firepower Threat Defense (FTD) - CVE-2023-20095

Vulnerability identifier: #VU82680

Vulnerability risk: High

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2023-20095

CWE-ID: CWE-400

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 application does not properly control consumption of internal resources in the remote access VPN feature. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cisco Adaptive Security Appliance (ASA): 9.8.1 - 9.8.4.45, 9.9.1 - 9.9.2.235, 9.10.1 - 9.18.1

Cisco Firepower Threat Defense (FTD): 9.8.1 - 9.8.1.7, 9.8.2 - 9.8.2.45, 9.8.3 - 9.8.3.29, 9.8.4 - 9.8.4.45, 9.9.1 - 9.9.1.5, 9.9.2 - 9.9.2.235, 9.10.1 - 9.10.1.44, 9.12.1 - 9.12.1.3, 9.12.2 - 9.12.2.9, 9.12.3 - 9.12.3.12, 9.12.4 - 9.12.4.41, 9.13.1 - 9.13.1.21, 9.14.1 - 9.14.1.30, 9.14.2 - 9.14.2.15, 9.14.3 - 9.14.3.18, 9.14.4 - 9.14.4.7, 9.15.1 - 9.15.1.21, 9.16.1 - 9.16.1.28, 9.16.2 - 9.16.2.14, 9.16.3 - 9.16.3.14, 9.17.1 - 9.17.1.9, 9.18.1

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External links
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-webvpn-dos-3GhZQBAS

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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.