Fortinet FortiSwitchManager/FortiSASE/FortiOS heap-based overflow

CVSS Meta Temp Score
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CTI Interest Score
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8.5$0-$5k0.63

Summaryinfo

A vulnerability, which was classified as critical, was found in Fortinet FortiSwitchManager, FortiSASE and FortiOS. Affected by this vulnerability is an unknown functionality. The manipulation results in heap-based overflow. This vulnerability is reported as CVE-2025-25249. The attack can be launched remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Fortinet FortiSwitchManager, FortiSASE and FortiOS (affected version not known). It has been classified as critical. Affected is some unknown functionality. The manipulation with an unknown input leads to a heap-based overflow vulnerability. CWE is classifying the issue as CWE-122. 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(). This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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

The advisory is shared for download at fortiguard.fortinet.com. This vulnerability is traded as CVE-2025-25249 since 02/05/2025. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 282655 (Fortinet Fortigate Heap-based buffer overflow in cw_acd daemon (FG-IR-25-084)), which helps to determine the existence of the flaw in a target environment.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (282655) and EUVD (EUVD-2026-2223). Once again VulDB remains the best source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.7
VulDB Meta Temp Score: 8.5

VulDB Base Score: 8.1
VulDB Temp Score: 7.7
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔒

CNA Base Score: 8.1
CNA Vector (fortinet): 🔒

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Heap-based overflow
CWE: CWE-122 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 282655
Nessus Name: Fortinet Fortigate Heap-based buffer overflow in cw_acd daemon (FG-IR-25-084)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Timelineinfo

02/05/2025 CVE reserved
01/13/2026 +342 days Advisory disclosed
01/13/2026 +0 days VulDB entry created
06/09/2026 +147 days VulDB entry last update

Sourcesinfo

Vendor: fortinet.com

Advisory: FG-IR-25-084
Status: Confirmed

CVE: CVE-2025-25249 (🔒)
GCVE (CVE): GCVE-0-2025-25249
GCVE (VulDB): GCVE-100-340692
EUVD: 🔒

Entryinfo

Created: 01/13/2026 18:04
Updated: 06/09/2026 14:05
Changes: 01/13/2026 18:04 (63), 01/13/2026 23:16 (2), 01/14/2026 01:51 (1), 01/16/2026 06:14 (11), 01/16/2026 10:35 (1), 02/23/2026 15:48 (1), 06/09/2026 14:05 (1)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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