Home CIS Advisories Multiple Vulnerabilities in Fortinet Products Could Allow for Arbitrary Code Execution Multiple Vulnerabilities in Fortinet Products Could Allow for Arbitrary Code Execution MS-ISAC ADVISORY NUMBER: 2026-003 DATE(S) ISSUED: 01/13/2026 OVERVIEW: Multiple vulnerabilities have been discovered in Fortinet products, the most severe of which could allow for arbitrary code execution. FortiSandbox is an advanced threat detection solution from Fortinet that uses sandboxing to analyze suspicious files and network traffic for advanced threats like zero-day malware and ransomware. FortiWeb is a web application firewall (WAF) that protects web applications and APIs from cyberattacks like SQL injection and cross-site scripting, while also helping to meet compliance requirements. FortiVoice is a unified communications solution that combines voice, chat, conferencing, and fax into a single, secure platform for businesses and schools. FortiOS is the Fortinet’s proprietary Operation System which is utilized across multiple product lines. FortiProxy is a secure web gateway product from Fortinet that protects users from internet-borne attacks, enforces compliance, and improves network performance. FortiClientEMS is a centralized management platform for deploying, configuring, monitoring, and enforcing security policies across numerous endpoints (computers) running the FortiClient agent. FortiSwitchManager is Fortinet's dedicated, on-premise platform for centrally managing FortiSwitch devices in large deployments. FortiFone is Fortinet's secure, enterprise-grade unified communications solution. Successful exploitation of the most severe of these vulnerabilities could allow for arbitrary code execution in the context of the affected service account. Depending on the privileges associated with the service account an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Service accounts that are configured to have fewer user rights on the system could be less impacted than those who operate with administrative user rights. THREAT INTELLIGENCE: There are currently no reports of these vulnerabilities being exploited in the wild. SYSTEMS AFFECTED: FortiVoice 7.2.0 through 7.2.2 FortiVoice 7.0.0 through 7.0.7 FortiClientEMS 7.4.3 through 7.4.4 FortiClientEMS 7.4.0 through 7.4.1 FortiClientEMS 7.2.0 through 7.2.10 FortiClientEMS 7.0 all versions FortiOS 7.6.0 through 7.6.3 FortiOS 7.4.0 through 7.4.8 FortiOS 7.2.0 through 7.2.11 FortiOS 7.0.0 through 7.0.17 FortiOS 6.4.0 through 6.4.16 FortiSASE 25.2.b FortiSASE 25.1.a.2 FortiSwitchManager 7.2.0 through 7.2.6 FortiSwitchManager 7.0.0 through 7.0.5 FortiSandbox 5.0.0 through 5.0.4 FortiSandbox 4.4 all versions FortiSandbox 4.2 all versions FortiSandbox 4.0 all versions FortiFone 7.0.0 through 7.0.1 FortiFone 3.0.13 through 3.0.23 FortiSIEM 7.4.0 FortiSIEM 7.3.0 through 7.3.4 FortiSIEM 7.2.0 through 7.2.6 FortiSIEM 7.1.0 through 7.1.8 FortiSIEM 7.0.0 through 7.0.4 FortiSIEM 7.0.0 through 7.0.4 RISK: Government: Large and medium government entities HIGH Small government MEDIUM Businesses: Large and medium business entities HIGH Small business entities MEDIUM Home Users: LOW TECHNICAL SUMMARY: Multiple vulnerabilities have been discovered in Fortinet products, the most severe of which could allow for arbitrary code execution. Details of the vulnerabilities are as follows: Tactic: Initial Access ( TA0001 ) Technique: Exploitation Public-Facing Application ( T1190 ): A heap-based buffer overflow vulnerability [CWE-122] in FortiOS and FortiSwitchManager cw_acd daemon may allow a remote unauthenticated attacker to execute arbitrary code or commands via specifically crafted requests. (CVE-2025-25249) An improper neutralization of special elements used in an OS command ('OS Command Injection') vulnerability [CWE-78] in FortiSIEM may allow an unauthenticated attacker to execute unauthorized code or commands via crafted TCP requests. (CVE-2025-64155) Details of lower severity vulnerabilities: An improper limitation of a pathname to a restricted directory ('path traversal') vulnerability in FortiVoice may allow a privileged attacker to delete files from the underlying filesystem via crafted HTTP or HTTPs requests. (CVE-2025-58693) An improper neutralization of special elements used in an SQL command ('SQL Injection') vulnerability [CWE-89] in FortiClientEMS may allow an authenticated attacker with at least read-only admin permission to execute unauthorized SQL code or commands via crafted HTTP or HTTPs requests. (CVE-2025-59922) A Server-Side Request Forgery (SSRF) vulnerability [CWE-918] in FortiSandbox may allow an authenticated attacker to proxy internal requests limited to plaintext endpoints only via crafted HTTP requests. (CVE-2025-67685) An exposure of sensitive information to an unauthorized actor [CWE-200] vulnerability in FortiFone Web Portal page may allow an unauthenticated attacker to obtain the device conf