Cisco · Adaptive Security Appliance and Firepower Threat Defense
CVE-2023-20269
Cisco Adaptive Security Appliance and Firepower Threat Defense Unauthorized Access Vulnerability
O que é
A vulnerability in the remote access VPN feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to conduct a brute force attack in an attempt to identify valid username and password combinations or an authenticated, remote attacker to establish a clientless SSL VPN session with an unauthorized user.
This vulnerability is due to improper separation of authentication, authorization, and accounting (AAA) between the remote access VPN feature and the HTTPS management and site-to-site VPN features. An attacker could exploit this vulnerability by specifying a default connection profile/tunnel group while conducting a brute force attack or while establishing a clientless SSL VPN session using valid credentials. A successful exploit could allow the attacker to achieve one or both of the following:
Identify valid credentials that could then be used to establish an unauthorized remote access VPN session.
Establish a clientless SSL VPN session (only when running Cisco ASA Software Release 9.16 or earlier).
Notes:
Establishing a client-based remote access VPN tunnel is not possible as these default connection profiles/tunnel groups do not and cannot have an IP address pool configured.
This vulnerability does not allow an attacker to bypass authentication. To successfully establish a remote access VPN session, valid credentials are required, including a valid second factor if multi-factor authentication (MFA) is configured.
Cisco will release software updates that address this vulnerability. There are workarounds that address this vulnerability.
CISA: Cisco Adaptive Security Appliance and Firepower Threat Defense contain an unauthorized access vulnerability that could allow an unauthenticated, remote attacker to conduct a brute force attack in an attempt to identify valid username and password combinations or establish a clientless SSL VPN session with an unauthorized user.
O que fazer
Apply mitigations per vendor instructions for group-lock and vpn-simultaneous-logins or discontinue use of the product for unsupported devices.
Prazo para as agências federais dos EUA: 4 de outubro de 2023
Mais falhas exploradas de Cisco
| Adicionado | Vulnerabilidade | Produto | Gravidade | Chance de ataque |
|---|---|---|---|---|
| 14 de out. de 2026 | Relative Path Traversal | Secure Email Gateway | Crítica 9,8 | 2,2% |
| 30 de set. de 2026 | Hex Encoding | Catalyst SD-WAN Manager | Crítica 9,8 | 39% |
| 16 de set. de 2026 | Incorrect Use of Privileged APIs | Identity Services Engine | Crítica 10,0 | 76% |
| 14 de set. de 2026 | SQL Injection | Secure Email Gateway | Crítica 9,8 | 30% |
| 9 de set. de 2026 | Firewall Management Center Authentication Bypass Using an Alternate Path or Channel | Secure Firewall Management Center (FMC) and Security Cloud Control (SCC) Firewall Management | Crítica 10,0 | 88% |
| 11 de ago. de 2026 | Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Heap Inspection | Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) | Alto 8,6 | 1,0% |
| 29 de jul. de 2026 | Secure Firewall Management Center Use of Hard-coded Password | Secure Firewall Management Center (FMC) | Média 5,3 | 35% |
| 13 de jul. de 2026 | Cross-Site Request Forgery | IOS | Alto 8,1 | 34% |
Fontes: Known Exploited Vulnerabilities (CISA, domínio público), CVE records (cve.org) e EPSS (FIRST). A chance de ataque é a estimativa EPSS de que alguém tente explorar a falha nos próximos 30 dias.