Cisco Small Business Switches Secure Shell Certificate Authentication Bypass Vulnerability
Published May 3, 2019
7.2
HIGHCVSS 3.1
EPSS 0.84%
Description
A vulnerability in the Secure Shell (SSH) authentication process of Cisco Small Business Switches software could allow an attacker to bypass client-side certificate authentication and revert to password authentication. The vulnerability exists because OpenSSH mishandles the authentication process. An attacker could exploit this vulnerability by attempting to connect to the device via SSH. A successful exploit could allow the attacker to access the configuration as an administrative user if the default credentials are not changed. There are no workarounds available; however, if client-side certificate authentication is enabled, disable it and use strong password authentication. Client-side certificate authentication is disabled by default.
Affected products
-
- Version unspecifiedStatusaffectedConstraints<1.4.10.6
- Version unspecifiedStatusaffectedConstraints<2.5.0.78
- 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 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cisco | Cisco Small Business 200 Series Smart Switches | n/a |
|
Configuration 1
- < 1.4.10.6
Configuration 2
- < 1.4.10.6
Configuration 3
- < 1.4.10.6
Running on/with
- n/a
Configuration 4
- < 1.4.10.6
Configuration 5
- < 1.4.10.6
Configuration 6
- < 1.4.10.6
Running on/with
- n/a
Configuration 7
- < 1.4.10.6
Configuration 8
- < 1.4.10.6
Running on/with
- n/a
Configuration 9
- < 1.4.10.6
Configuration 10
- < 1.4.10.6
Configuration 11
- < 1.4.10.6
Configuration 12
- < 1.4.10.6
Configuration 13
- < 1.4.10.6
Running on/with
- n/a
Configuration 14
- < 1.4.10.6
Configuration 15
- < 1.4.10.6
Configuration 16
- < 1.4.10.6
Running on/with
- n/a
Configuration 17
- < 1.4.10.6
Running on/with
- n/a
Configuration 18
- < 1.4.10.6
Running on/with
- n/a
Configuration 19
- < 1.4.10.6
Running on/with
- n/a
Configuration 20
- < 1.4.10.6
Running on/with
- n/a
Configuration 21
- < 1.4.10.6
Running on/with
- n/a
Configuration 22
- < 1.4.10.6
Running on/with
- n/a
Configuration 23
- < 1.4.10.6
Configuration 24
- < 1.4.10.6
Configuration 25
- < 1.4.10.6
Running on/with
- n/a
Configuration 26
- < 1.4.10.6
Configuration 27
- < 1.4.10.6
Configuration 28
- < 1.4.10.6
Configuration 29
- < 1.4.10.6
Configuration 30
- < 1.4.10.6
Running on/with
- n/a
Configuration 31
- < 1.4.10.6
Configuration 32
- < 1.4.10.6
Configuration 33
- < 1.4.10.6
Configuration 34
- < 1.4.10.6
Configuration 35
- < 1.4.10.6
Configuration 36
- < 1.4.10.6
Configuration 37
- < 1.4.10.6
Configuration 38
- < 1.4.10.6
Running on/with
- n/a
Configuration 39
- < 1.4.10.6
Running on/with
- n/a
Configuration 40
- < 1.4.10.6
Running on/with
- n/a
Configuration 41
- < 1.4.10.6
Configuration 42
- < 1.4.10.6
Running on/with
- n/a
Configuration 43
- < 1.4.10.6
Running on/with
- n/a
Configuration 44
- < 1.4.10.6
Running on/with
- n/a
Configuration 45
- < 1.4.10.6
Running on/with
- n/a
Configuration 46
- < 1.4.10.6
Configuration 47
- < 1.4.10.6
Configuration 48
- < 1.4.10.6
Configuration 49
- < 1.4.10.6
Configuration 50
- < 1.4.10.6
Configuration 51
- < 1.4.10.6
Configuration 52
- < 1.4.10.6
Configuration 53
- < 1.4.10.6
Configuration 54
- < 1.4.10.6
Configuration 55
- < 1.4.10.6
Running on/with
- n/a
Configuration 56
- < 1.4.10.6
Configuration 57
- < 1.4.10.6
Running on/with
- n/a
Configuration 58
- < 2.5.0.78
Configuration 59
- < 2.5.0.78
Running on/with
- n/a
Configuration 60
- < 2.5.0.78
Configuration 61
- < 2.5.0.78
Running on/with
- n/a
Configuration 62
- < 2.5.0.78
Configuration 63
- < 2.5.0.78
Running on/with
- n/a
Configuration 64
- < 2.5.0.78
Configuration 65
- < 2.5.0.78
Configuration 66
- < 2.5.0.78
Configuration 67
- < 2.5.0.78
Running on/with
- n/a
Configuration 68
- < 2.5.0.78
Configuration 69
- < 2.5.0.78
Configuration 70
- < 2.5.0.78
Running on/with
- n/a
Configuration 71
- < 2.5.0.78
Configuration 72
- < 2.5.0.78
Configuration 73
- < 2.5.0.78
Configuration 74
- < 2.5.0.78
Configuration 75
- < 2.5.0.78
Running on/with
- n/a
Configuration 76
- < 2.5.0.78
Configuration 77
- < 2.5.0.78
Configuration 78
- < 2.5.0.78
Running on/with
- n/a
Configuration 79
- < 2.5.0.78
Configuration 80
- < 2.5.0.78
Configuration 81
- < 2.5.0.78
Configuration 82
- < 2.5.0.78
Running on/with
- n/a
Configuration 83
- < 2.5.0.78
Configuration 84
- < 2.5.0.78
Configuration 85
- < 2.5.0.78
Running on/with
- n/a
Configuration 86
- < 2.5.0.78
Running on/with
- n/a
Configuration 87
- < 2.5.0.78
Running on/with
- n/a
Configuration 88
- < 2.5.0.78
Running on/with
- n/a
Configuration 89
- < 2.5.0.78
Running on/with
- n/a
Configuration 90
- < 2.5.0.78
Configuration 91
- < 2.5.0.78
Running on/with
- n/a
Configuration 92
- < 2.5.0.78
Running on/with
- n/a
Configuration 93
- < 2.5.0.78
Configuration 94
- < 2.5.0.78
Running on/with
- n/a
Configuration 95
- < 2.5.0.78
Running on/with
- n/a
Configuration 96
- < 2.5.0.78
Running on/with
- n/a
Configuration 97
- < 2.5.0.78
Running on/with
- n/a
Configuration 98
- < 2.5.0.78
Running on/with
- n/a
Configuration 99
- < 2.5.0.78
Running on/with
- n/a
Configuration 100
- < 2.5.0.78
Configuration 101
- < 2.5.0.78
Configuration 102
- < 2.5.0.78
Configuration 103
- < 2.5.0.78
Running on/with
- n/a
Configuration 104
- < 2.5.0.78
Running on/with
- n/a
Configuration 105
- < 2.5.0.78
Running on/with
- n/a
Configuration 106
- < 2.5.0.78
Configuration 107
- < 2.5.0.78
Running on/with
- n/a
Configuration 108
- < 2.5.0.78
Running on/with
- n/a
Configuration 109
- < 2.5.0.78
Configuration 110
- < 2.5.0.78
Running on/with
- n/a
Configuration 111
- < 2.5.0.78
Running on/with
- n/a
Configuration 112
- < 2.5.0.78
Configuration 113
- < 2.5.0.78
Running on/with
- n/a
Configuration 114
- < 2.5.0.78
Running on/with
- 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.
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
AV:N/AC:L/Au:S/C:P/I:P/A:P
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
TotalDecision
n/aAssessed Nov 20, 2024 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 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 (12 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 0.84% (0.00839) | 56.37th | v5 (v2026.06.15) |
| Sep 20, 2026 | 0.84% (0.00839) | 56.28th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.10% (0.00104) | 43.04th | v3 (v2023.03.01) |
| Jun 28, 2024 | 0.10% (0.00104) | 42.91th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.10% (0.00104) | 40.90th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00885) | 27.89th | v2 (v2022.01.01) |
| Apr 1, 2022 | 0.89% (0.00885) | 24.24th | v2 (v2022.01.01) |
| Feb 4, 2022 | 9.03% (0.09029) | 86.86th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.84% (0.01840) | 47.83th | v1 |
| Jan 6, 2022 | 1.84% (0.01840) | 47.32th | v1 |
| Jan 5, 2022 | 0.42% (0.00416) | 26.65th | v5 (v2026.06.15) |
| Apr 14, 2021 | 0.42% (0.00416) | 0.00th | v1 |
References (1)
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190501-scbv vendor-advisoryx_refsource_CISCOVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190501-scbv | vendor-advisoryx_refsource_CISCOVendor Advisory |
Change history (0)
No recorded changes yet.