Exploited vulnerability CISA KEV
CVE-2025-25249: Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability
CVE-2025-25249 is a vulnerability in Fortinet Multiple Products that CISA added to its Known Exploited Vulnerabilities catalog on September 9, 2026, meaning there is evidence it is being exploited. US federal civilian agencies must complete the required action by September 12, 2026.
CVE-2025-25249 is a vulnerability in Fortinet Multiple Products that CISA added to its Known Exploited Vulnerabilities catalog on September 9, 2026, meaning there is evidence it is being exploited. US federal civilian agencies must complete the required action by September 12, 2026.
- CVE ID
- CVE-2025-25249
- Vendor / project
- Fortinet
- Product
- Multiple Products
- Added to KEV
- Due date
- Days to remediate
- 3
- Known ransomware use
- Unknown
CISA description #
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.
Required action #
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.
Notes and references #
https://fortiguard.fortinet.com/psirt/FG-IR-25-084 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2025-25249
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