What’s Vulnerable › Vulnerabilities
CVE-2026-20250: Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software for Firepower 3100 and 4200 Series DTLS Denial of Service Vulnerability
- Severity: high (CVSS 8.6 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.6% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-09-16 · updated 2026-09-18
- Weakness: CWE-772
Description
A vulnerability in Datagram TLS (DTLS) message handling of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software for Cisco Secure Firewall 3100 Series and 4200 Series devices could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper resource management when processing certain DTLS messages. An attacker could exploit this vulnerability by sending a crafted stream of DTLS traffic to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.
Affected products
- Cisco ASA Software: 9.23.1, 9.22.1.1, 9.22.1.3, 9.22.1.6, 9.22.2, 9.23.1.3 (+11)
- Cisco Firepower Threat Defense Software: 7.6.0, 7.7.0, 7.6.1, 7.6.2, 7.7.10, 7.7.11 (+4)
In the news
References
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