CVE-2025-25249 Exploited in the wild

Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability

Risk score: 83/100
CVSS: Not Scored
Added to CISA's exploited list: 9 Sep 2026

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What to know

What it is: 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.
Affected: Fortinet Multiple Products
Fix: Apply the vendor's security update; see the linked advisory.
Exploitation: Exploited in the wild

Story map

Story map: the flaws, the fix, how it unfolded and what it connects to. Boxes link to the record or article.

At a glance

Fortinet Multiple Products: Red, act today. An Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') [CWE-22] vulnerability in Fortinet FortiOS 7.6.0 through 7.6.4, FortiOS 7.4.0 through 7.4.9, FortiOS 7.2 all versions, FortiOS 7.0 all versions, FortiOS 6.4 all versions, FortiPAM 1.7.0, FortiPAM 1.6 all versions, FortiPAM 1.5 all versio…

The flaws

CVE-2025-25249: Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability (exploited)
CVE-2025-61624: Fortinet Multiple Products Path Traversal Vulnerability (CVSS 6.5 · EPSS 1% · exploited)

The fix

Fix: Apply the vendor's security update; see the linked advisory.

Who is exposed: Fortinet Multiple Products

Where it stands

Exploited in the wild
On CISA's exploited list since 9 Sep
US federal deadline 12 Sep

How it unfolded

9 Sep, CISA (official): Added to the Known Exploited Vulnerabilities list (2 of these flaws)
12 Sep, Deadline (official): US federal agencies must have patched

Connects to

Same weakness: Heap buffer overflow (CWE-122). 399 other warnings in 30 days

Why it is Red

Not yet scored by NVD
Exploited in the wild (CISA KEV)
On your watchlist: fortinet

CISA 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.

Original 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.

Last activity 9 Sep 2026. Patch Forecast updates every hour.