Fortinet AV Engine Bypass via MIME Base64 (6.2.168/6.4.274)
CVE-2022-26122 Published on November 2, 2022

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.

NVD

Vulnerability Analysis

CVE-2022-26122 is exploitable with network access, requires user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, with no impact on integrity, and no impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
REQUIRED
Scope:
CHANGED
Confidentiality Impact:
NONE
Integrity Impact:
LOW
Availability Impact:
NONE

Products Associated with CVE-2022-26122

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2022-26122 are published in these products:

Fortinet Fortimail
 
Fortinet FortiOS
 
Fortinet Antivirus Engine
 
Fortinet FortiClient
 

Affected Versions

Fortinet AV Engine, FortiMail, FortiOS, FortiClient Version AV Engine version 6.2.168 and below and version 6.4.274 and below. is affected by CVE-2022-26122

Exploit Probability

EPSS
0.12%
Percentile
30.81%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.