CVE-2025-25249

Modified
Published: 13 Jan 2026, 16:32
Last modified:10 Sept 2026, 03:55

Vulnerability Summary

Overall Risk (default)
high
70/100
CVSS Score
9.8 CRITICAL
v3.1 (nvd)
EPSS Score
0.76% LOW
1% probability +0.74%
KEV
Listed
CISA
1 listing
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

13 Jan 2026, 16:32
Published
Vulnerability first disclosed
09 Sept 2026, 00:00
Added to CISA KEV
Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability
10 Sept 2026, 03:55
Last Modified
Vulnerability information updated
12 Sept 2026, 00:00
CISA Remediation Due
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.

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

CVSS Metrics

  • v3.1•HIGH•Score: 7.4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:W/RC:C
  • v3.1•CRITICAL•Score: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.76%• Percentile: 53%

Techniques & Countermeasures

  • CWE-122•Heap-based Buffer Overflow

    A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

  • CWE-787•Out-of-bounds Write

    The product writes data past the end, or before the beginning, of the intended buffer.

Affected Systems

  • fortinet•fortios

    ≥ 7.6.0, ≤ 7.6.2 | ≥ 7.4.0, ≤ 7.4.7 | ≥ 7.2.4, ≤ 7.2.11 | ≥ 6.4.0, < 6.4.17 | ≥ 7.0.0, < 7.0.18 | ≥ 7.2.0, < 7.2.12 | ≥ 7.4.0, < 7.4.9 | ≥ 7.6.0, < 7.6.4

  • fortinet•fortisase

    25.1.39 | 25.1.51

  • fortinet•fortiswitchmanager

    ≥ 7.2.2, ≤ 7.2.5 | ≥ 7.0.0, < 7.0.6 | ≥ 7.2.0, < 7.2.7

References (4)