Fortinet FortiOS, FortiSwitchManager, and FortiSASE contain a heap-based buffer overflow vulnerability that allows an attacker to execute unauthorized code or commands via specially crafted packets.
This vulnerability appears in CISA's catalog of known exploited vulnerabilities. It is not a theoretical risk — it is being used in the wild.
Fortinet FortiOS, FortiSwitchManager, and FortiSASE contain a heap-based buffer overflow vulnerability that allows an attacker to execute unauthorized code or commands via specially crafted packets.
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
CVSSv3 Score: 7.3 An improper certificate validation vulnerability in FortiOS and FortiProxy Agentless ZTNA portal may allow a remote and unauthenticated attacker to perform a Man-in-the-Middle attack on the communication channel between the ZTNA portal and the backend destination website. Revised on 2026-09-08 00:00:00
CVSSv3 Score: 4.7 An improper access control vulnerability in FortiManager may allow an administrator to bypass the approval process for workflow sessions via crafted HTTP or HTTPs requests. Revised on 2026-09-08 00:00:00
CVSSv3 Score: 5.9 A Use of Uninitialized Variable vulnerability in Fortinet FortiAnalyzer SNMP daemon may allow a remote authenticated attacker with user permission to cause a denial of service via SNMP GETBULK requests. Revised on 2026-09-08 00:00:00