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

State: Published
Severity: 8.6 High
Published: Sep 16, 2026
Updated: Sep 18, 2026
Reserved: Oct 8, 2025

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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.

Scores

CVSS	Score	Vector	Source
3.1	8.6 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H	cisco

Weaknesses

CWE-772 Missing Release of Resource after Effective Lifetime

Affected Products

Product	Versions
Cisco Secure Firewall Adaptive Security Appliance (ASA) SoftwareCisco	9.23.1Affected 9.22.1.1Affected 9.22.1.3Affected 9.22.1.6Affected 9.22.2Affected 9.23.1.3Affected 9.22.2.4Affected 9.23.1.7Affected 9.22.2.9Affected 9.23.1.13Affected 9.22.2.13Affected 9.23.1.19Affected 9.22.2.14Affected 9.24.1Affected 9.23.1.22Affected 9.22.2.20Affected 9.23.1.26Affected
Cisco Secure Firewall Threat Defense (FTD) SoftwareCisco	7.6.0Affected 7.7.0Affected 7.6.1Affected 7.6.2Affected 7.7.10Affected 7.7.11Affected 7.6.2.1Affected 7.7.10.1Affected 7.6.4Affected 10.0.0Affected

References

cisco-sa-asaftd-dtls-dos-Kp57HkyO

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