CVE-2026-20248

CVE-2026-20248 affects the DNS over TCP implementation in Cisco Secure Firewall Adaptive Security Appliance (ASA) and Cisco Secure Firewall Threat Defense (FTD) Software. The root cause is a logic error in parsing DNS queries and tracking the size of incoming buffers. An unauthenticated, remote a...

EUVD-2026-81143

A vulnerability in the DNS over TCP 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 cause the TCP DNS response handler to unexpectedly restart, causing the...

CVE-2026-20248 Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software TCP DNS Denial of Service Vulnerability

A vulnerability in the DNS over TCP 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 cause the TCP DNS response handler to unexpectedly restart, causing the...

CVE-2026-20248 Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software TCP DNS Denial of Service Vulnerability

A vulnerability in the DNS over TCP 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 cause the TCP DNS response handler to unexpectedly restart, causing the...

CVE-2026-20329

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Adaptive Security Appliance Software, Cisco Secure Firewall Threat Defense Software and Cisco Secure Firewall Management Center Software engineering team has conducted a comprehensive internal securi...

CVE-2026-20324

A vulnerability in the sftunnel inter-device communication protocol of Cisco Secure Firewall Management Center FMC Software could allow an authenticated, remote attacker to execute arbitrary commands as root. This vulnerability exists because a registered sftunnel peer has incorrect permissions t...

CVE-2026-20242

A vulnerability in the External Database Access feature of Cisco Secure Firewall Management Center FMC Software could allow an unauthenticated, remote attacker to execute arbitrary commands as root on an affected device. This vulnerability is due to insecure deserialization of a user-supplied Jav...

CVE-2026-20323

CVE-2026-20323 affects the sftunnel inter-device communication protocol in Cisco Secure FMC Software and Cisco Secure FTD Software . The root cause is improper management of the TLS certificate used for the sftunnel management connection. An unauthenticated, adjacent attacker with high attack com...

CVE-2026-20323 Cisco Secure Firewall Management Center and Secure Firewall Threat Defense Software sftunnel Unauthorized Authentication Bypass Vulnerability

A vulnerability in the sftunnel inter-device communication protocol of Cisco Secure FMC Software and Cisco Secure FTD Software could allow an unauthenticated, adjacent attacker to impersonate the peer device and obtain access at the level of the manager role, which is equivalent to root. This...

CVE-2026-20333 Cisco Secure Adaptive Security Appliance Software, Secure Firewall Threat Defense Software and Secure Firewall Management Center Software Hardening Release - Incorrect Comparison Vulnerabilities

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Adaptive Security Appliance Software, Cisco Secure Firewall Threat Defense Software and Cisco Secure Firewall Management Center Software engineering team has conducted a comprehensive internal securi...

EUVD-2026-81133

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Adaptive Security Appliance Software, Cisco Secure Firewall Threat Defense Software and Cisco Secure Firewall Management Center Software engineering team has conducted a comprehensive internal securi...

CVE-2026-20334

CVE-2026-20334 affects Cisco Secure Adaptive Security Appliance Software , Cisco Secure Firewall Threat Defense (FTD) Software , and Cisco Secure Firewall Management Center (FMC) Software . The vulnerabilities stem from improper adherence to coding standards grouped under CWE-710 , discovered dur...

EUVD-2026-81130

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Adaptive Security Appliance Software, Cisco Secure Firewall Threat Defense Software and Cisco Secure Firewall Management Center Software engineering team has conducted a comprehensive internal securi...

CVE-2026-20332 Cisco Secure Adaptive Security Appliance Software, Secure Firewall Threat Defense Software and Secure Firewall Management Center Software Hardening Release - Improper Access Control Vulnerabilities

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Adaptive Security Appliance Software, Cisco Secure Firewall Threat Defense Software and Cisco Secure Firewall Management Center Software engineering team has conducted a comprehensive internal securi...

CVE-2026-20344

Cisco Secure Firewall Management Center (FMC) Software contains a SQL injection vulnerability in its web-based management interface, caused by insufficient validation of user-supplied input. An authenticated remote attacker holding the Security Approver , Access Admin , or Network Admin role can ...

CVE-2026-20154 Cisco Secure Firewall Adaptive Security Appliance Software and Secure Firewall Threat Defense Software Logging Denial of Service

A vulnerability in the system rate-limiting process for syslog message 419002 of Cisco Secure Firewall Adaptive Security Appliance ASA Software and Cisco Secure Firewall Threat Defense FTD Software could allow an unauthenticated, remote attacker to cause high CPU utilization on an affected device...

CVE-2026-20154

CVE-2026-20154 affects Cisco Secure Firewall ASA and FTD Software. The root cause is improper rate limiting for syslog message 419002. An unauthenticated remote attacker can trigger a denial of service by sending a flood of TCP SYN packets , causing high CPU utilization and performance degradatio...

CVE-2026-20154 Cisco Secure Firewall Adaptive Security Appliance Software and Secure Firewall Threat Defense Software Logging Denial of Service

A vulnerability in the system rate-limiting process for syslog message 419002 of Cisco Secure Firewall Adaptive Security Appliance ASA Software and Cisco Secure Firewall Threat Defense FTD Software could allow an unauthenticated, remote attacker to cause high CPU utilization on an affected device...

EUVD-2026-81128

A vulnerability in the system rate-limiting process for syslog message 419002 of Cisco Secure Firewall Adaptive Security Appliance ASA Software and Cisco Secure Firewall Threat Defense FTD Software could allow an unauthenticated, remote attacker to cause high CPU utilization on an affected device...

CVE-2026-20343

A vulnerability in a critical API of Cisco Secure Firewall Management Center (FMC) Software arises because the API lacks authentication . An unauthenticated, remote attacker can exploit it by repeatedly invoking the API, potentially downloading sensitive files that should be restricted and consum...