strongswan: Authentication bypass in eap-mschapv2 plugin
Published Nov 18, 2015
5.0
MEDIUMCVSS 2.0
EPSS 2.58%
Description
The server implementation of the EAP-MSCHAPv2 protocol in the eap-mschapv2 plugin in strongSwan 4.2.12 through 5.x before 5.3.4 does not properly validate local state, which allows remote attackers to bypass authentication via an empty Success message in response to an initial Challenge message.
Affected products
No data.
Configuration 1
- 14.04
- 15.04
- 15.10
Configuration 2
- 4.2.12
- 4.2.13
- 4.2.14
- 4.2.15
- 4.2.16
- 4.3.0
- 4.3.1
- 4.3.2
- 4.3.3
- 4.3.4
- 4.3.5
- 4.3.6
- 4.3.7
- 4.4.0
- 4.4.1
- 4.5.0
- 4.5.1
- 4.5.2
- 4.5.3
- 4.6.0
- 4.6.1
- 4.6.2
- 4.6.3
- 4.6.4
- 5.0.0
- 5.0.1
- 5.0.2
- 5.0.3
- 5.0.4
- 5.1.0
- 5.1.1
- 5.1.2
- 5.1.3
- 5.2.0
- 5.2.1
- 5.2.2
- 5.2.3
- 5.3.0
- 5.3.1
- 5.3.2
- 5.3.3
No data.
Red Hat Enterprise Linux 7
strongimcv
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 7 | strongimcv | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue did not affect the versions of strongimcv as shipped with Red Hat Enterprise Linux 7, as they did not include support for the eap-mschapv2 plugin.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:N/I:P/A:N
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
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 | 2.58% (0.02582) | 84.67th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.58% (0.02582) | 83.15th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.52% (0.00515) | 64.62th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.53% (0.00527) | 77.75th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.53% (0.00527) | 76.29th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.53% (0.00527) | 73.40th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.32% (0.01319) | 71.27th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.32% (0.01319) | 71.23th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.32% (0.01319) | 69.22th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.32% (0.01319) | 44.98th | v2 (v2022.01.01) |
References (10)
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00025.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-updates/2015-11/msg00139.html vendor-advisoryx_refsource_SUSE
- http://www.debian.org/security/2015/dsa-3398 vendor-advisoryx_refsource_DEBIAN
- http://www.securityfocus.com/bid/84947 vdb-entryx_refsource_BID
- http://www.ubuntu.com/usn/USN-2811-1 vendor-advisoryx_refsource_UBUNTU
- https://access.redhat.com/security/cve/CVE-2015-8023 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1283219 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2015-8023
- https://www.cve.org/CVERecord?id=CVE-2015-8023
- https://www.strongswan.org/blog/2015/11/16/strongswan-vulnerability-%28cve-2015-8023%29.html x_refsource_CONFIRM
| Link | Providers | Tags |
|---|---|---|
| http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00025.html | vendor-advisoryx_refsource_SUSE | |
| http://lists.opensuse.org/opensuse-updates/2015-11/msg00139.html | vendor-advisoryx_refsource_SUSE | |
| http://www.debian.org/security/2015/dsa-3398 | vendor-advisoryx_refsource_DEBIAN | |
| http://www.securityfocus.com/bid/84947 | vdb-entryx_refsource_BID | |
| http://www.ubuntu.com/usn/USN-2811-1 | vendor-advisoryx_refsource_UBUNTU | |
| https://access.redhat.com/security/cve/CVE-2015-8023 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1283219 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2015-8023 | ||
| https://www.cve.org/CVERecord?id=CVE-2015-8023 | ||
| https://www.strongswan.org/blog/2015/11/16/strongswan-vulnerability-%28cve-2015-8023%29.html | x_refsource_CONFIRM |
Change history (0)
No recorded changes yet.