Cisco Advance Notification for Publication of September 16, 2026, Security Advisories

On September 16, 2026, the Cisco Product Security Incident Response Team (PSIRT) published the advisories that are listed in the following tables. To remediate these vulnerabilities, Cisco strongly recommends that customers upgrade to the fixed software that is indicated in the advisories. For more information about changes in Cisco PSIRT vulnerability disclosure, see Strengthening the Foundation: A Predictable, Customer-Focused Response to AI-Accelerated Vulnerability Discovery. Cisco Identity Services Engine Title CVE ID SIR Base Score Cisco Identity Services Engine Hardening Release: September 2026 CVE-2026-20130 CVE-2026-20192 CVE-2026-20194 CVE-2026-20234 CVE-2026-20237 CVE-2026-20287 Critical 10.0 Cisco Identity Services Engine Vulnerabilities CVE-2026-76423 CVE-2026-76425 CVE-2026-76426 CVE-2026-76427 CVE-2026-76428 CVE-2026-76424 Critical 10.0 Cisco Identity Services Engine Authentication Bypass Vulnerability CVE-2026-76460 Critical 10.0 Cisco Identity Services Engine Remote Code Execution Vulnerabilities CVE-2026-20211 CVE-2026-20176 CVE-2026-20307 Critical 9.9 Cisco Identity Services Engine Authenticated Remote Code Execution and API Vulnerabilities CVE-2026-20282 CVE-2026-20283 CVE-2026-20284 Critical 9.1 Cisco Identity Services Engine Command Injection Vulnerabilities CVE-2026-20306 CVE-2026-20305 Critical 9.1 Cisco Identity Services Engine RADIUS Denial of Service Vulnerability CVE-2026-20352 High 8.6 Cisco Identity Services Engine SQL Injection Vulnerabilities CVE-2026-20247 CVE-2026-20300 High 7.5 Cisco Identity Services Engine Cross-Site Scripting Vulnerability CVE-2026-20309 Medium 6.1 Cisco Identity Services Engine Authentication Bypass Vulnerabilities CVE-2026-76439 CVE-2026-76446 CVE-2026-76447 CVE-2026-76444 Medium 5.3 Cisco Identity Services Engine Multiple Path Traversal Vulnerabilities CVE-2026-76434 CVE-2026-76433 CVE-2026-76431 CVE-2026-76432 Medium 5.3 Cisco Identity Services Engine Information Disclosure Vulnerability CVE-2026-20235 Medium 4.9 Cisco Identity Services Engine SQL and HQL Injection Vulnerabilities CVE-2026-76449 CVE-2026-76451 CVE-2026-76450 CVE-2026-76448 Medium 4.9 Cisco Identity Services Engine Authorization Bypass Vulnerabilities CVE-2026-20286 CVE-2026-20285 Medium 4.3 Cisco Identity Services Engine 802.1X Session Hijack and Information Disclosure Vulnerabilities CVE-2026-20071 CVE-2026-20072 Medium 3.8 Cisco Secure Firewall Adaptive Security Appliance, Secure Firewall Threat Defense, and Secure Firewall Management Center Software Note: For more information about Cisco Secure FMC Software, including recently disclosed vulnerabilities and their available fixes, see the Cisco Talos blog post. Title CVE ID SIR Base Score Cisco Secure Firewall Adaptive Security Appliance, Secure Firewall Threat Defense, and Secure Firewall Management Center Software Hardening Release: September 2026 CVE-2026-20334 CVE-2026-20330 CVE-2026-20335 CVE-2026-20331 CVE-2026-20332 CVE-2026-20329 CVE-2026-20333 CVE-2026-20336 Critical 9.9 Cisco Secure Firewall Management Center Software sftunnel Root Arbitrary Code Execution Vulnerability CVE-2026-20324 Critical 9.9 Cisco Secure Firewall Management Center Software Java Deserialization Remote Code Execution Vulnerability CVE-2026-20242 Critical 9.8 Cisco Secure Firewall Management Center Software Vulnerabilities CVE-2026-20344 CVE-2026-20341 CVE-2026-20340 CVE-2026-20342 CVE-2026-20343 Critical 9.1 Cisco Secure Firewall Management Center Software Vulnerabilities CVE-2026-76412 CVE-2026-76413 CVE-2026-76420 Critical 9.0 Cisco Secure Firewall Management Center and Secure Firewall Threat Defense Software sftunnel Vulnerabilities CVE-2026-20295 CVE-2026-20323 High 8.6 Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software IKEv2 Certificate Authentication Denial of Service Vulnerability CVE-2026-20249 High 8.6 Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software for Secure Firewall 3100 and 4200 Series DTLS Denial of Service Vulnerability CVE-2026-20250 High 8.6 Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Logging Denial of Service Vulnerability CVE-2026-20154 High 8.6 Cisco Secure Firewall Threat Defense Software TLS 1.3 Denial of Service Vulnerability CVE-2026-20135 High 8.6 Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software EIGRP Denial of Service Vulnerability CVE-2026-20222 High 7.4 Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software TCP DNS Denial of Service Vulnerability CVE-2026-20248 Medium 6.8 Cisco Secure Firewall Threat Defense Software Snort 2 SSL/TLS Denial of Service Vulnerability CVE-2026-20290 Medium 5.8 Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Object Group Access Control List Bypass Vulnerabilities CVE-2026-20120 CVE-2026-20121 Medium 5.8 Cisco Nexus Dashboard, Broa…