Home/CVE/An insufficient verification of data authenticity vulnerability [CWE-345] in FortiClient, FortiMail and FortiOS AV engin
CVE

CVE-2022-26122

An insufficient verification of data authenticity vulnerability [CWE-345] in FortiClient, FortiMail and FortiOS AV engin

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.

MEDIUM · CVSS 4.7 EPSS 0.00118
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-345Insufficient Verification of Data Authenticity
▤

Affected Products & Versions

11
fortinet antivirus engineall versions
fortinet fortimail>= 6.0.0 and <= 6.0.12
fortinet fortimail>= 6.2.0 and <= 6.2.9
fortinet fortimail>= 6.4.0 and <= 6.4.6
fortinet fortimail>= 7.0.0 and <= 7.0.2
fortinet fortimailall versions
fortinet fortios>= 6.0.0 and <= 6.0.15
fortinet fortios>= 6.2.0 and <= 6.2.11
▣

Scoring & Timeline

4.7
MEDIUM · CVSS v3.1 · psirt@fortinet.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD02 Nov 2022 · 12:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://fortiguard.com/psirt/FG-IR-22-074PatchVendor Advisory
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