A plaintext recovery of encrypted messages or a Man-in-the-middle (MiTM) attack on RSA PKCS #1 v1.5 encryption may be possible without knowledge of the server's private key
Published Sep 5, 2018
5.9
MEDIUMCVSS 3.0
EPSS 1.12%
Description
A plaintext recovery of encrypted messages or a Man-in-the-middle (MiTM) attack on RSA PKCS #1 v1.5 encryption may be possible without knowledge of the server's private key. Fortinet FortiOS 5.4.6 to 5.4.9, 6.0.0 and 6.0.1 are vulnerable by such attack under SSL Deep Inspection feature when CPx being used.
Affected products
-
- Version 5.4.9, 5.4.8, 5.4.7, 5.4.6StatusaffectedConstraints-
- Version 6.0.1, 6.0.0StatusaffectedConstraints-
- 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, Inc. | FortiOS | n/a |
|
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.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
AV:N/AC:M/Au:N/C:P/I:N/A:N
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 23, 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
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Table of values (9 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.12% (0.01124) | 65.05th | v5 (v2026.06.15) |
| Sep 20, 2026 | 1.12% (0.01124) | 64.81th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.07% (0.00074) | 32.31th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.07% (0.00074) | 30.42th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.08% (0.00080) | 32.75th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.95% (0.00954) | 36.37th | v2 (v2022.01.01) |
| Feb 4, 2022 | 0.95% (0.00954) | 16.28th | v2 (v2022.01.01) |
| Feb 3, 2022 | 0.83% (0.00833) | 24.58th | v5 (v2026.06.15) |
| Apr 14, 2021 | 0.83% (0.00833) | 0.00th | v1 |
References (3)
- https://fortiguard.com/advisory/FG-IR-17-302 x_refsource_CONFIRMVendor Advisory
- https://robotattack.org/ x_refsource_MISCThird Party Advisory
- https://www.kb.cert.org/vuls/id/144389 third-party-advisoryx_refsource_CERT-VNThird Party AdvisoryUS Government Resource
| Link | Providers | Tags |
|---|---|---|
| https://fortiguard.com/advisory/FG-IR-17-302 | x_refsource_CONFIRMVendor Advisory | |
| https://robotattack.org/ | x_refsource_MISCThird Party Advisory | |
| https://www.kb.cert.org/vuls/id/144389 | third-party-advisoryx_refsource_CERT-VNThird Party AdvisoryUS Government Resource |
Change history (0)
No recorded changes yet.