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Known Exploited Vulnerability
9.8
CRITICAL CVSS 3.1
CVE-2025-25249
Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability - [Actively Exploited]
Overview
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

Details
INFO

Published Date :

Jan. 13, 2026, 5:15 p.m.

Last Modified :

Sept. 10, 2026, 4:17 a.m.

Remotely Exploit :

Yes !

Source :

[email protected]
CISA Notification
CISA KEV (Known Exploited Vulnerabilities)

For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.

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.

Known Ransomware Campaign Use:

Unknown

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

Impact
Affected Products

The following products are affected by CVE-2025-25249 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Fortinet fortios
2 Fortinet fortiswitchmanager
3 Fortinet fortios
4 Fortinet fortisase
: Total Affected Vendor : 1 | Products : 4
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 134c704f-9b21-4f2e-91b3-4a467353bcc0
CVSS 3.1 HIGH 6abe59d8-c742-4dff-8ce8-9b0ca1073da8
CVSS 3.1 HIGH [email protected]
CVSS 3.1 CRITICAL [email protected]
Solution
Apply vendor patches for affected Fortinet products to fix heap-based buffer overflow.
  • Update FortiOS to a patched version.
  • Update FortiSASE to a patched version.
  • Update FortiSwitchManager to a patched version.
Public PoC/Exploit Available at Github

CVE-2025-25249 has a 2 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2025-25249.

URL Resource
https://fortiguard.fortinet.com/psirt/FG-IR-25-084 Vendor Advisory
https://cert-portal.siemens.com/productcert/html/ssa-864900.html
https://socradar.io/blog/cve-2025-25249-pivotc2-fortigate-rat/
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-25249
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-25249 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2025-25249 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Profile Photo
1337or420/FortiGate-FortiWeb-Multi-Exploit-Extractor

FortiGate & FortiWeb Multi-Exploit Extractor v3.0 Мощный сканер уязвимостей для FortiGate и FortiWeb, поддерживающий несколько известных CVE и извлечение учетных данных.

Go

Updated: 1 month, 3 weeks ago
2 stars 1 fork 1 watcher
Born at : May 14, 2026, 2:07 p.m. This repo has been linked 8 different CVEs too.
Profile Photo
Krishcalin/Fortinet-Network-Security

A python based passive and active firewall configuration and rule checker

firewall-configuration firewall-management firewall-rules ngfw-configuration fortigate-automation fortigate-configuration fortigate-firewall fortigate-firewall-configuration

Python HTML

Updated: 2 months ago
1 stars 0 fork 0 watcher
Born at : March 14, 2026, 6:13 p.m. This repo has been linked 25 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-25249 vulnerability anywhere in the article.

  • TheCyberThrone
CISA KEV Update – 8 Vulnerabilities Added in Two Days

CISA’s Known Exploited Vulnerabilities (KEV) Catalog saw a significant two-day update on September 8 and September 9, 2026, with eight vulnerabilities added based on evidence of active exploitation.CI ... Read more

Published Date: Sep 10, 2026 (8 hours, 27 minutes ago)
  • The Cyber Express
MS-ISAC Flags High-Risk Security Flaws in Fortinet Products

A new cybersecurity advisory from the Multi-State Information Sharing and Analysis Center (MS-ISAC) is alerting organizations to multiple vulnerabilities affecting Fortinet products, some of which cou ... Read more

Published Date: Jan 14, 2026 (7 months, 3 weeks ago)
  • Daily CyberSecurity
Fortinet Critical Alert: CVE-2025-64155 RCE & Config Leaks Exposed

Fortinet has issued a sweeping set of security advisories, patching critical vulnerabilities across its product ecosystem that could allow attackers to execute arbitrary code, delete files, or hijack ... Read more

Published Date: Jan 14, 2026 (7 months, 3 weeks ago)

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2025-25249 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Sep. 10, 2026

    Action Type Old Value New Value
    Changed SSVC {'id': 'CVE-2025-25249', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-09-09T19:50:11.566505Z'} {'id': 'CVE-2025-25249', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-01-13T00:00:00+00:00'}
  • CVE CISA KEV Update by 9119a7d8-5eab-497f-8521-727c672e3725

    Sep. 09, 2026

    Action Type Old Value New Value
    Added Date Added 2026-09-09
    Added Due Date 2026-09-09
    Added Required Action 2026-09-09
    Added Vulnerability Name 2026-09-09
  • CVE Modified by 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e

    Sep. 09, 2026

    Action Type Old Value New Value
    Added Reference https://cert-portal.siemens.com/productcert/html/ssa-864900.html
    Removed Reference https://cert-portal.siemens.com/productcert/html/ssa-864900.html
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Sep. 09, 2026

    Action Type Old Value New Value
    Added Reference https://socradar.io/blog/cve-2025-25249-pivotc2-fortigate-rat/
    Added Reference https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-25249
    Changed SSVC {'id': 'CVE-2025-25249', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-01-14T04:57:25.533277Z'} {'id': 'CVE-2025-25249', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-09-09T19:50:11.566505Z'}
  • CVE Modified by [email protected]

    Sep. 09, 2026

    Action Type Old Value New Value
    Added Reference https://fortiguard.fortinet.com/psirt/FG-IR-25-084
    Removed Reference https://fortiguard.fortinet.com/psirt/FG-IR-25-084
    Removed Reference Type https://fortiguard.fortinet.com/psirt/FG-IR-25-084 Types: Vendor Advisory
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Jun. 17, 2026

    Action Type Old Value New Value
    Added SSVC {'id': 'CVE-2025-25249', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-01-14T04:57:25.533277Z'}
  • CVE Modified by [email protected]

    Jun. 17, 2026

    Action Type Old Value New Value
    Added Affected [{'cpes': ['cpe:2.3:a:fortinet:fortiswitchmanager:7.2.5:*:*:*:*:*:*:*', 'cpe:2.3:a:fortinet:fortiswitchmanager:7.2.4:*:*:*:*:*:*:*', 'cpe:2.3:a:fortinet:fortiswitchmanager:7.2.3:*:*:*:*:*:*:*', 'cpe:2.3:a:fortinet:fortiswitchmanager:7.2.2:*:*:*:*:*:*:*'], 'vendor': 'Fortinet', 'product': 'FortiSwitchManager', 'versions': [{'status': 'affected', 'version': '7.2.2', 'versionType': 'semver', 'lessThanOrEqual': '7.2.5'}], 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:2.3:o:fortinet:fortios:7.6.2:*:*:*:*:*:*:*', 'cpe:2.3:o:fortinet:fortios:7.6.1:*:*:*:*:*:*:*', 'cpe:2.3:o:fortinet:fortios:7.6.0:*:*:*:*:*:*:*', 'cpe:2.3:o:fortinet:fortios:7.4.7:*:*:*:*:*:*:*', 'cpe:2.3:o:fortinet:fortios:7.4.6:*:*:*:*:*:*:*', 'cpe:2.3:o:fortinet:fortios:7.4.5:*:*:*:*:*:*:*', 'cpe:2.3:o:fortinet:fortios:7.4.4:*:*:*:*:*:*:*', 'cpe:2.3:o:fortinet:fortios:7.4.3:*:*:*:*:*:*:*', 'cpe:2.3:o:fortinet:fortios:7.4.2:*:*:*:*:*:*:*', 'cpe:2.3:o:fortinet:fortios:7.4.1:*:*:*:*:*:*:*', 'cpe:2.3:o:fortinet:fortios:7.4.0:*:*:*:*:*:*:*', 'cpe:2.3:o:fortinet:fortios:7.2.11:*:*:*:*:*:*:*', 'cpe:2.3:o:fortinet:fortios:7.2.10:*:*:*:*:*:*:*', 'cpe:2.3:o:fortinet:fortios:7.2.9:*:*:*:*:*:*:*', 'cpe:2.3:o:fortinet:fortios:7.2.8:*:*:*:*:*:*:*', 'cpe:2.3:o:fortinet:fortios:7.2.7:*:*:*:*:*:*:*', 'cpe:2.3:o:fortinet:fortios:7.2.6:*:*:*:*:*:*:*', 'cpe:2.3:o:fortinet:fortios:7.2.5:*:*:*:*:*:*:*', 'cpe:2.3:o:fortinet:fortios:7.2.4:*:*:*:*:*:*:*'], 'vendor': 'Fortinet', 'product': 'FortiOS', 'versions': [{'status': 'affected', 'version': '7.6.0', 'versionType': 'semver', 'lessThanOrEqual': '7.6.2'}, {'status': 'affected', 'version': '7.4.0', 'versionType': 'semver', 'lessThanOrEqual': '7.4.7'}, {'status': 'affected', 'version': '7.2.4', 'versionType': 'semver', 'lessThanOrEqual': '7.2.11'}], 'defaultStatus': 'unaffected'}]
  • CVE Modified by 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e

    Jun. 17, 2026

    Action Type Old Value New Value
    Added Affected [{'vendor': 'Siemens', 'product': 'RUGGEDCOM APE1808', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '*', 'versionType': 'custom'}], 'defaultStatus': 'unknown'}]
  • CVE Modified by 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e

    Jun. 09, 2026

    Action Type Old Value New Value
    Added Reference https://cert-portal.siemens.com/productcert/html/ssa-864900.html
  • CVE Modified by [email protected]

    Feb. 23, 2026

    Action Type Old Value New Value
    Changed 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 6.4.0 through 6.4.16, 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 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
  • CVE Modified by [email protected]

    Jan. 16, 2026

    Action Type Old Value New Value
    Changed 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 6.4.0 through 6.4.16, FortiSASE 25.2.b, FortiSASE 25.1.a.2, 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 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 6.4.0 through 6.4.16, 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
  • Initial Analysis by [email protected]

    Jan. 14, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Added CWE CWE-787
    Added CPE Configuration OR *cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:* versions from (including) 7.6.0 up to (excluding) 7.6.4 *cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:* versions from (including) 7.0.0 up to (excluding) 7.0.18 *cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:* versions from (including) 7.2.0 up to (excluding) 7.2.12 *cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:* versions from (including) 7.4.0 up to (excluding) 7.4.9 *cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:* versions from (including) 6.4.0 up to (excluding) 6.4.17
    Added CPE Configuration OR *cpe:2.3:a:fortinet:fortiswitchmanager:*:*:*:*:*:*:*:* versions from (including) 7.0.0 up to (excluding) 7.0.6 *cpe:2.3:a:fortinet:fortiswitchmanager:*:*:*:*:*:*:*:* versions from (including) 7.2.0 up to (excluding) 7.2.7
    Added CPE Configuration OR *cpe:2.3:a:fortinet:fortisase:25.1.39:*:*:*:-:*:*:* *cpe:2.3:a:fortinet:fortisase:25.1.51:*:*:*:-:*:*:*
    Added Reference Type Fortinet, Inc.: https://fortiguard.fortinet.com/psirt/FG-IR-25-084 Types: Vendor Advisory
  • New CVE Received by [email protected]

    Jan. 13, 2026

    Action Type Old Value New Value
    Added 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 6.4.0 through 6.4.16, FortiSASE 25.2.b, FortiSASE 25.1.a.2, 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
    Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
    Added CWE CWE-122
    Added Reference https://fortiguard.fortinet.com/psirt/FG-IR-25-084
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 9.8
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact