Denial of service in Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software

1) Resource exhaustion

EUVDB-ID: #VU82680

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 - Resource exhaustion

Exploit availability: No

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 - 9.18.1

Cisco Firepower Threat Defense (FTD): 9.8.1 - 9.18.1

CPE2.3

• cpe:2.3:h:cisco_systems:asa:9.8.1:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:asa:9.8.1.5:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:asa:9.8.1.7:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:asa:9.8.2:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:asa:9.8.2.8:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:asa:9.8.2.14:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:asa:9.8.2.15:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:asa:9.8.2.17:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:asa:9.8.2.20:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:asa:9.8.2.24:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_ftd:9.8.1:*:*:*:*:*:*:*

External links

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

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.