ARM mbed TLS before 1.3.21 and 2.x before 2.1.9, if optional authentication is configured, allows remote attackers to bypass peer authentication via an X.509 certificate chain with many intermediates
Published Aug 30, 2017
8.1
HIGHCVSS 3.0
EPSS 1.50%
Description
ARM mbed TLS before 1.3.21 and 2.x before 2.1.9, if optional authentication is configured, allows remote attackers to bypass peer authentication via an X.509 certificate chain with many intermediates. NOTE: although mbed TLS was formerly known as PolarSSL, the releases shipped with the PolarSSL name are not affected.
Affected products
No data.
- 1.3.19
- 1.3.21
- 2.1.7
- 2.1.9
- 2.4.2
- 2.6.2
- 1.3.10
- 1.3.11
- 1.3.12
- 1.3.13
- 1.3.14
- 1.3.15
- 1.3.16
- 1.3.17
- 1.3.18
- 1.3.20
- 2.0.0
- 2.1.0
- 2.1.1
- 2.1.2
- 2.1.3
- 2.1.4
- 2.1.5
- 2.1.6
- 2.1.8
- 2.2.0
- 2.2.1
- 2.3.0
- 2.4.0
- 2.5.1
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:H/A:H
AV:N/AC:M/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
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
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.50% (0.01505) | 73.42th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.49% (0.01492) | 70.68th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.11% (0.00108) | 26.59th | v4 (v2025.03.14) |
| Jul 20, 2024 | 0.72% (0.00716) | 80.74th | v3 (v2023.03.01) |
| Mar 20, 2024 | 0.72% (0.00716) | 80.10th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.72% (0.00716) | 78.10th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.60% (0.00602) | 75.18th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.21% (0.01213) | 66.61th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.21% (0.01213) | 40.54th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.57% (0.01565) | 33.71th | v5 (v2026.06.15) |
| Apr 14, 2021 | 1.57% (0.01565) | 0.00th | v1 |
References (5)
- http://www.debian.org/security/2017/dsa-3967 vendor-advisoryx_refsource_DEBIAN
- https://bugs.debian.org/873557 x_refsource_CONFIRMIssue TrackingPatchThird Party Advisory
- https://github.com/ARMmbed/mbedtls/commit/31458a18788b0cf0b722acda9bb2f2fe13a3fb32 x_refsource_CONFIRMIssue TrackingPatchThird Party Advisory
- https://github.com/ARMmbed/mbedtls/commit/d15795acd5074e0b44e71f7ede8bdfe1b48591fc x_refsource_CONFIRMIssue TrackingPatchThird Party Advisory
- https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2017-02 x_refsource_CONFIRMVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| http://www.debian.org/security/2017/dsa-3967 | vendor-advisoryx_refsource_DEBIAN | |
| https://bugs.debian.org/873557 | x_refsource_CONFIRMIssue TrackingPatchThird Party Advisory | |
| https://github.com/ARMmbed/mbedtls/commit/31458a18788b0cf0b722acda9bb2f2fe13a3fb32 | x_refsource_CONFIRMIssue TrackingPatchThird Party Advisory | |
| https://github.com/ARMmbed/mbedtls/commit/d15795acd5074e0b44e71f7ede8bdfe1b48591fc | x_refsource_CONFIRMIssue TrackingPatchThird Party Advisory | |
| https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2017-02 | x_refsource_CONFIRMVendor Advisory |
Change history (0)
No recorded changes yet.