CVEvulnerability

CVE-2025-25249

9.8 CRITICAL Known exploited Published 2026-01-13 Modified 2026-10-07 Official page ↗

CISA Known Exploited Vulnerability

Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability — Fortinet Multiple Products

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.

Added to KEV: 2026-09-09
Remediation due: 2026-09-12
Ransomware use: Unknown
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: 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

Status: Analyzed
Published: 2026-01-13
Last modified: 2026-10-07
Assigner: [email protected]
CVSS 3.1 ([email protected]): 8.1 HIGH — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 3.1 ([email protected]): 9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses: CWE-122, CWE-787

Description

A heap-based buffer overflow vulnerability in Fortinet 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 all versions, FortiSwitchManager 7.2.0 through 7.2.6, FortiSwitchManager 7.0.0 through 7.0.5 allows attacker to execute unauthorized code or commands via specially crafted packets

Affected configurations

• fortinet fortios (>= 6.4.0 < 7.0.18) • fortinet fortios (>= 7.2.0 < 7.2.12) • fortinet fortios (>= 7.4.0 < 7.4.9) • fortinet fortios (>= 7.6.0 < 7.6.4) • fortinet fortiswitchmanager (>= 7.0.0 < 7.0.6) • fortinet fortiswitchmanager (>= 7.2.0 < 7.2.7) • fortinet fortisase 25.1.39 • fortinet fortisase 25.1.51 • siemens ruggedcom ape1808 firmware

Weakness · CWE (2)

CWE-122 Heap-based Buffer Overflow weakness
CWE-787 Out-of-bounds Write weakness

References