MEDIUM
CyaSSL does not check the key usage extension in leaf certificates, which allows remote attackers to spoof servers via a crafted server certificate not authorized for use in an SSL/TLS handshake
Published Oct 6, 2017
5.9
MEDIUMCVSS 3.0
EPSS 0.96%
Description
CyaSSL does not check the key usage extension in leaf certificates, which allows remote attackers to spoof servers via a crafted server certificate not authorized for use in an SSL/TLS handshake.
Affected products
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
5.9 MEDIUM NVD
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact High
Integrity Impact None
Availability Impact None
4.3 MEDIUM NVD
AV:N/AC:M/Au:N/C:P/I:N/A:N
Access Vector Network
Access Complexity Medium
Authentication None
Confidentiality Impact Partial
Integrity Impact None
Availability Impact None
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
0.96% 0.00959
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.00959
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 (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.96% (0.00959) | 60.10th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.96% (0.00959) | 56.71th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.19% (0.00191) | 38.83th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.15% (0.00152) | 52.88th | v3 (v2023.03.01) |
| Jun 13, 2024 | 0.15% (0.00152) | 51.63th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.15% (0.00152) | 49.62th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.05% (0.01055) | 52.13th | v2 (v2022.01.01) |
| Sep 17, 2022 | 1.05% (0.01055) | 50.47th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.05% (0.01055) | 48.43th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.05% (0.01055) | 27.52th | v2 (v2022.01.01) |
Weaknesses (1)
References (2)
- http://secunia.com/advisories/62604 third-party-advisoryx_refsource_SECUNIAPermissions RequiredThird Party Advisory
- http://www.openwall.com/lists/oss-security/2014/04/18/2 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| http://secunia.com/advisories/62604 | third-party-advisoryx_refsource_SECUNIAPermissions RequiredThird Party Advisory | |
| http://www.openwall.com/lists/oss-security/2014/04/18/2 | mailing-listx_refsource_MLISTMailing ListThird Party Advisory |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Oct 6, 2017
Updated Aug 6, 2024
Reserved Apr 18, 2014
Link CVE-2014-2903
CISA Vulnrichment
Updated n/a