Cisco ASA Out-of-bounds Write (CVE-2026-20023)

A vulnerability in the OSPF protocol of Cisco Secure Firewall Adaptive Security Appliance ASA Software and Cisco Secure Firewall Threat Defense FTD Software could allow an unauthenticated, adjacent attacker to corrupt memory on an affected device, resulting in a denial of service DoS condition...

The vulnerability of the Cisco Secure Firewall Management Center (formerly known as Cisco Firepower Management Center) and the Cisco Secure Firewall Threat Defense (FTD) software lies in errors related to the authentication process. These errors allow attackers to bypass existing security mechanisms or cause service interruptions.

The vulnerabilities of the Cisco Secure Firewall Management Center formerly known as Cisco Firepower Management Center and the Cisco Secure Firewall Threat Defense FTD software are related to errors in the certificate validation process. Exploiting these vulnerabilities can allow attackers to...

The vulnerabilities of the Cisco Secure Firewall Management Center (formerly known as Cisco Firepower Management Center) and the Cisco Secure Firewall Threat Defense (FTD) software are related to uncontrolled memory allocation. This allows attackers to bypass existing security mechanisms or cause service interruptions.

The vulnerability of the Cisco Secure Firewall Management Center formerly known as Cisco Firepower Management Center and the Cisco Secure Firewall Threat Defense FTD software lies in the uncontrolled distribution of memory resources. Exploiting this vulnerability could allow a malicious actor to...

The vulnerability of the EIGRP protocol implementation in Cisco Secure Firewall Threat Defense (FTD) and Cisco Secure Firewall Adaptive Security Appliance (ASA) allows attackers to induce service interruptions.

The vulnerability of the EIGRP protocol implementation in Cisco Secure Firewall Threat Defense FTD and Cisco Secure Firewall Adaptive Security Appliance ASA is related to improper memory release. Exploiting this vulnerability can allow a malicious actor to cause service interruptions...

The vulnerability of the Cisco Secure Firewall Threat Defense (FTD) software-based TLS protocol implementation allows a attacker to cause a service failure.

The vulnerability of the Cisco Secure Firewall Threat Defense FTD software-based TLS protocol implementation is related to a memory reclamation error. Exploiting this vulnerability could allow an attacker to cause a service failure...

The vulnerability of the IKEv2 protocol implementation in Cisco Secure Firewall Threat Defense (FTD) and Cisco Secure Firewall Adaptive Security Appliance (ASA) allows attackers to induce service interruptions.

The vulnerability of the IKEv2 protocol implemented by Cisco Secure Firewall Threat Defense FTD and Cisco Secure Firewall Adaptive Security Appliance ASA is related to incorrect data type conversion. Exploiting this vulnerability can allow a malicious actor to cause service interruptions remotely...

The vulnerability of the speed-limiting mechanism in syslog 419002 of Cisco Secure Firewall Threat Defense (FTD) and Cisco Secure Firewall Adaptive Security Appliance (ASA) allows a attacker to trigger a service failure.

The vulnerability of the syslog 419002 mechanism used by Cisco Secure Firewall Threat Defense FTD and Cisco Secure Firewall Adaptive Security Appliance ASA relates to improper memory release. Exploiting this vulnerability could allow a malicious actor to cause a service failure...

The vulnerabilities of Cisco Secure Firewall Threat Defense (FTD) and Cisco Secure Firewall Adaptive Security Appliance (ASA), as well as the Cisco Secure Firewall Management Center (formerly Cisco Firepower Management Center) software, are related to a flaw in the data protection mechanism. This flaw allows attackers to bypass existing security measures.

The vulnerabilities of Cisco Secure Firewall Threat Defense FTD and Cisco Secure Firewall Adaptive Security Appliance ASA, as well as the Cisco Secure Firewall Management Center formerly known as Cisco Firepower Management Center software, are related to the compromise of the data protection...

The vulnerability of the DTLS protocol implementation in Cisco Secure Firewall Threat Defense (FTD) and Cisco Secure Firewall Adaptive Security Appliance (ASA) allows a attacker to induce a service failure.

The vulnerability of the DTLS protocol implemented by Cisco Secure Firewall Threat Defense FTD and Cisco Secure Firewall Adaptive Security Appliance ASA is related to the failure to release resources after the expiration of their useful life. Exploiting this vulnerability can allow a malicious...

Cisco Secure Firewall Threat Defense Software TLS 1.3 DoS (cisco-sa-ftd-tls1-3-dos-dLxwFWgF)

According to its self-reported version, Cisco Secure Firewall Threat Defense FTD Software is affected by a denial of service vulnerability. A flaw exists within the TLS 1.3 implementation due to improper buffer management. An unauthenticated, remote attacker can exploit this issue, via a crafted...

Cisco Secure Firewall Threat Defense Software sftunnel Authentication Bypass (cisco-sa-fmcftd-sftun-multivulns-WGVHOrN3)

According to its self-reported version, Cisco Secure Firewall Threat Defense FTD Software is affected by multiple vulnerabilities. - A denial of service DoS vulnerability exists in the sftunnel functionality due to improper memory management. An unauthenticated, remote attacker can exploit this...

CVE-2026-20290

A vulnerability in SSL/TLS certificate parsing in the Snort 2 Detection Engine of Cisco Secure Firewall Threat Defense FTD Software could allow an unauthenticated, remote attacker to cause the Snort 2 Detection Engine to restart. This vulnerability is due to incomplete validation of the SSL...

CVE-2026-20135

A vulnerability in the TLS 1.3 implementation in Cisco Secure Firewall Threat Defense FTD Software could allow an unauthenticated, remote attacker to cause an affected device to reload unexpectedly, resulting in a denial of service DoS condition. This vulnerability is due to improper buffer...

CVE-2026-20290

CVE-2026-20290 affects the Snort 2 Detection Engine within Cisco Secure Firewall Threat Defense (FTD) Software . The root cause is incomplete validation of SSL certificates during parsing. An unauthenticated, remote attacker can exploit this by sending a crafted SSL connection setup request, caus...

CVE-2026-20290 Cisco Secure Firewall Threat Defense Software Snort 2 SSL/TLS Denial of Service Vulnerability

A vulnerability in SSL/TLS certificate parsing in the Snort 2 Detection Engine of Cisco Secure Firewall Threat Defense FTD Software could allow an unauthenticated, remote attacker to cause the Snort 2 Detection Engine to restart. This vulnerability is due to incomplete validation of the SSL...

EUVD-2026-81150

A vulnerability in SSL/TLS certificate parsing in the Snort 2 Detection Engine of Cisco Secure Firewall Threat Defense FTD Software could allow an unauthenticated, remote attacker to cause the Snort 2 Detection Engine to restart. This vulnerability is due to incomplete validation of the SSL...

CVE-2026-20290 Cisco Secure Firewall Threat Defense Software Snort 2 SSL/TLS Denial of Service Vulnerability

A vulnerability in SSL/TLS certificate parsing in the Snort 2 Detection Engine of Cisco Secure Firewall Threat Defense FTD Software could allow an unauthenticated, remote attacker to cause the Snort 2 Detection Engine to restart. This vulnerability is due to incomplete validation of the SSL...

CVE-2026-20135

Cisco Secure Firewall Threat Defense (FTD) Software is vulnerable to a denial of service (DoS) via its TLS 1.3 implementation . The root cause is improper buffer management during TLS 1.3 connections. An unauthenticated, remote attacker can trigger a DoS by sending a crafted TLS 1.3 packet to a T...

CVE-2026-20135 Cisco Secure Firewall Threat Defense Software TLS 1.3 Denial of Service Vulnerability

A vulnerability in the TLS 1.3 implementation in Cisco Secure Firewall Threat Defense FTD Software could allow an unauthenticated, remote attacker to cause an affected device to reload unexpectedly, resulting in a denial of service DoS condition. This vulnerability is due to improper buffer...

CVE-2026-20135 Cisco Secure Firewall Threat Defense Software TLS 1.3 Denial of Service Vulnerability

A vulnerability in the TLS 1.3 implementation in Cisco Secure Firewall Threat Defense FTD Software could allow an unauthenticated, remote attacker to cause an affected device to reload unexpectedly, resulting in a denial of service DoS condition. This vulnerability is due to improper buffer...