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
Published Nov 2, 2022
8.6
HIGHCVSS 3.1
EPSS 0.48%
Description
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.
Affected products
-
- Version AV Engine version 6.2.168 and below and version 6.4.274 and below.StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Fortinet | Fortinet AV Engine, FortiMail, FortiOS, FortiClient | n/a |
|
- 0.4.23
- 2.0.49
- 2.0.60
- 4.4.54
- 6.33
- 6.137
- 6.142
- 6.144
- 6.145
- 6.156
- 6.157
- 6.243
- 6.252
- 6.253
- ≥ 6.0.0 · ≤ 6.0.12
- ≥ 6.2.0 · ≤ 6.2.9
- ≥ 6.4.0 · ≤ 6.4.6
- ≥ 7.0.0 · ≤ 7.0.2
- 4.1.0
- ≥ 6.0.0 · ≤ 6.0.15
- ≥ 6.2.0 · ≤ 6.2.11
- ≥ 6.4.0 · ≤ 6.4.10
- ≥ 7.0.0 · ≤ 7.0.6
- 7.2.0
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
1 other source (CVE.org) ▾
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N/E:P/RL:U/RC:R
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed Oct 22, 2024 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.48% (0.00478) | 38.95th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.44% (0.00444) | 35.17th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.07% (0.00075) | 20.05th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.07% (0.00073) | 33.80th | v3 (v2023.03.01) |
| Jun 6, 2024 | 0.07% (0.00073) | 31.58th | v3 (v2023.03.01) |
| Apr 14, 2024 | 0.07% (0.00071) | 29.56th | v3 (v2023.03.01) |
| Nov 9, 2023 | 0.06% (0.00064) | 26.72th | v3 (v2023.03.01) |
| Oct 3, 2023 | 0.05% (0.00051) | 17.48th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.05% (0.00048) | 14.90th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00885) | 27.89th | v2 (v2022.01.01) |
| Nov 3, 2022 | 0.89% (0.00885) | 26.80th | v2 (v2022.01.01) |
References (1)
- https://fortiguard.com/psirt/FG-IR-22-074 PatchVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://fortiguard.com/psirt/FG-IR-22-074 | PatchVendor Advisory |
Change history (0)
No recorded changes yet.