Cisco Secure Firewall Threat Defense Software vulnerabilities

CVE-2026-20019 [MEDIUM] CWE-835 CVE-2026-20019: Multiple Cisco products are affected by a vulnerability in the Snort 3 NetFlow Detection Engine that Multiple Cisco products are affected by a vulnerability in the Snort 3 NetFlow Detection Engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection. This vulnerability is due to incomplete error checking when Snort 3 parses UDP Netflow Protocol pack

CVE-2026-20179 [MEDIUM] CWE-128 CVE-2026-20179: Multiple Cisco products are affected by a vulnerability in the Snort 3 Generic Routing Encapsulation Multiple Cisco products are affected by a vulnerability in the Snort 3 Generic Routing Encapsulation (GRE) Detection Engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection. This vulnerability is due to incomplete error checking when Snort 3 pars

CVE-2026-20197 [MEDIUM] CWE-119 CVE-2026-20197: Multiple Cisco products are affected by a vulnerability in the Snort 3 Teredo Detection Engine that Multiple Cisco products are affected by a vulnerability in the Snort 3 Teredo Detection Engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection. This vulnerability is due to incomplete error checking when Snort 3 parses Teredo packets. An attacker

CVE-2026-20073 [MEDIUM] CWE-284 CVE-2026-20073: A vulnerability in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure A vulnerability in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to send traffic that should be denied through an affected device. This vulnerability is due to improper error handling when an affected device that is joining a c

CVE-2026-20221 [MEDIUM] CWE-476 CVE-2026-20221: Multiple Cisco products are affected by a vulnerability in the generic routing encapsulation (GRE) t Multiple Cisco products are affected by a vulnerability in the generic routing encapsulation (GRE) tunnel decapsulation feature of the Snort 3 Detection Engine that could allow an unauthenticated, remote attacker to cause an unexpected restart of the Snort 3 Detection Engine. This vulnerability is due to improper handling of nested GRE traffic. An

CVE-2026-20011 [MEDIUM] CWE-805 CVE-2026-20011: Multiple Cisco products are affected by a vulnerability in the Snort 3 SMTP MIME Decoder that could Multiple Cisco products are affected by a vulnerability in the Snort 3 SMTP MIME Decoder that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart. This vulnerability is due to a lack of error checking when the MIME fields of the SMTP header are parsed. An attacker could exploit this vulnerability by sendi

CVE-2026-20067 [MEDIUM] CWE-787 CVE-2026-20067: Multiple Cisco products are affected by a vulnerability in the Snort 3 detection engine that could a Multiple Cisco products are affected by a vulnerability in the Snort 3 detection engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection. This vulnerability is due to incomplete error checking when parsing the Multicast DNS fields of the HTTP hea

CVE-2026-20066 [MEDIUM] CWE-400 CVE-2026-20066: Multiple Cisco products are affected by a vulnerability in the Snort 3 Detection Engine that could a Multiple Cisco products are affected by a vulnerability in the Snort 3 Detection Engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection. This vulnerability is due to an error in the JSTokenizer normalization logic when the HTTP inspection normal

CVE-2026-20013 [MEDIUM] CWE-401 CVE-2026-20013: A vulnerability in the IKEv2 feature of Cisco Secure Firewall ASA Software and Cisco Secure FTD Soft A vulnerability in the IKEv2 feature of Cisco Secure Firewall ASA Software and Cisco Secure FTD Software could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device that may also impact the availability of services to devices elsewhere in the network. This vulnerability is due to memory exhaustion caused by not fre

CVE-2026-20015 [MEDIUM] CWE-401 CVE-2026-20015: A vulnerability in the IKEv2 feature of Cisco Secure Firewall ASA Software and Cisco Secure FTD Soft A vulnerability in the IKEv2 feature of Cisco Secure Firewall ASA Software and Cisco Secure FTD Software could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device that may impact the availability of services to devices elsewhere in the network. This vulnerability is due to a memory leak when parsing IKEv2 packets

CVE-2026-20007 [MEDIUM] CWE-284 CVE-2026-20007: A vulnerability in the Snort 2 and Snort 3 deep packet inspection of Cisco Secure Firewall Threat De A vulnerability in the Snort 2 and Snort 3 deep packet inspection of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass configured Snort rules and allow traffic onto the network that should have been dropped. This vulnerability is due to a logic error in the integration of the Snort Engine

CVE-2026-20008 [MEDIUM] CWE-78 CVE-2026-20008: A vulnerability in a small subset of CLI commands that are used on Cisco Secure Firewall Adaptive Se A vulnerability in a small subset of CLI commands that are used on Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, local attacker to craft Lua code that could be used on the underlying operating system as root. This vulnerability exists because use

CVE-2026-20005 [MEDIUM] CWE-392 CVE-2026-20005: Multiple Cisco products are affected by a vulnerability in the Snort 3 Detection Engine that could a Multiple Cisco products are affected by a vulnerability in the Snort 3 Detection Engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection. This vulnerability is due to incomplete parsing of the SSL handshake ingress packets. An attacker could explo

CVE-2026-20054 [MEDIUM] CWE-835 CVE-2026-20054: Multiple Cisco products are affected by a vulnerability in the Snort 3 VBA feature that could allow Multiple Cisco products are affected by a vulnerability in the Snort 3 VBA feature that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to crash. This vulnerability is due to improper error checking when decompressing VBA data. An attacker could exploit this vulnerability by sending crafted VBA data to the Snort

CVE-2026-76489 [MEDIUM] CWE-401 CVE-2026-76489: Multiple Cisco products are affected by a vulnerability in the memory management implementation of S Multiple Cisco products are affected by a vulnerability in the memory management implementation of Snort 3 that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection. This vulnerability is due to incomplete error checking when Snort 3 processes files, whic

CVE-2026-20053 [MEDIUM] CWE-122 CVE-2026-20053: Multiple Cisco products are affected by a vulnerability in the Snort 3 VBA feature that could allow Multiple Cisco products are affected by a vulnerability in the Snort 3 VBA feature that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to crash. This vulnerability is due to improper range checking when decompressing VBA data, which is user controlled. An attacker could exploit this vulnerability by sending cra

CVE-2026-20068 [MEDIUM] CWE-248 CVE-2026-20068: Multiple Cisco products are affected by a vulnerability in the Snort 3 detection engine that could a Multiple Cisco products are affected by a vulnerability in the Snort 3 detection engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection. This vulnerability is due to incomplete error checking when parsing remote procedure call (RPC) data. An att

CVE-2026-20058 [MEDIUM] CWE-786 CVE-2026-20058: Multiple Cisco products are affected by vulnerabilities in the Snort 3 VBA feature that could allow Multiple Cisco products are affected by vulnerabilities in the Snort 3 VBA feature that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to crash. These vulnerabilities are due to improper error checking when decompressing VBA data. An attacker could exploit these vulnerabilities by sending crafted VBA data to th

CVE-2026-20065 [MEDIUM] CWE-667 CVE-2026-20065: Multiple Cisco products are affected by a vulnerability in the Snort 3 Detection Engine that could a Multiple Cisco products are affected by a vulnerability in the Snort 3 Detection Engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection. This vulnerability is due to an error in the binder module initialization logic of the Snort Detection Engin

CVE-2026-20121 [MEDIUM] CWE-284 CVE-2026-20121: A vulnerability in the access control list (ACL) Object Group Search (OGS) implementation of Cisco S A vulnerability in the access control list (ACL) Object Group Search (OGS) implementation of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass configured access controls. This vulnerability is due to a logic error in popu