Fortinet FortiClient/FortiMail/FortiOS up to 6.2.168/6.4.274 AV Engine data authenticity

CVSS Meta Temp Score
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CTI Interest Score
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6.2$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic was found in Fortinet FortiClient, FortiMail and FortiOS up to 6.2.168/6.4.274. Impacted is an unknown function of the component AV Engine. Executing a manipulation can lead to data authenticity. This vulnerability is registered as CVE-2022-26122. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability has been found in Fortinet FortiClient, FortiMail and FortiOS up to 6.2.168/6.4.274 (Firewall Software) and classified as problematic. This vulnerability affects an unknown function of the component AV Engine. The manipulation with an unknown input leads to a data authenticity vulnerability. The CWE definition for the vulnerability is CWE-345. The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data. As an impact it is known to affect integrity, and availability. CVE summarizes:

An insufficient verification of data authenticity vulnerability [CWE-345] in FortiClient, FortiMail and FortiOS AV engines version 6.2.168 and below and version 6.4.274 and below may allow an attacker to bypass the AV engine via manipulating MIME attachment with junk and pad characters in base64.

The weakness was published 11/02/2022. The advisory is shared for download at fortiguard.com. This vulnerability was named CVE-2022-26122 since 02/25/2022. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 209739 (Fortinet Fortigate (FG-IR-22-074)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (209739) and EUVD (EUVD-2022-30689). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.2
VulDB Meta Temp Score: 6.2

VulDB Base Score: 5.4
VulDB Temp Score: 5.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.6
NVD Vector: 🔍

CNA Base Score: 4.7
CNA Vector (Fortinet, Inc.): 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Data authenticity
CWE: CWE-345
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: 209739
Nessus Name: Fortinet Fortigate (FG-IR-22-074)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

02/25/2022 🔍
11/02/2022 +250 days 🔍
11/02/2022 +0 days 🔍
05/08/2026 +1283 days 🔍

Sourcesinfo

Vendor: fortinet.com

Advisory: fortiguard.com
Status: Confirmed

CVE: CVE-2022-26122 (🔍)
GCVE (CVE): GCVE-0-2022-26122
GCVE (VulDB): GCVE-100-212800
EUVD: 🔍

Entryinfo

Created: 11/02/2022 16:04
Updated: 05/08/2026 19:58
Changes: 11/02/2022 16:04 (48), 12/03/2022 15:04 (12), 10/27/2024 03:24 (16), 04/28/2025 19:13 (3), 05/08/2026 19:58 (1)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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