strongswan: rogue servers are able to gain user credentials from a client in certain IKEv2 setups
Published Jun 10, 2015
2.6
LOWCVSS 2.0
EPSS 2.03%
Description
strongSwan 4.3.0 through 5.x before 5.3.2 and strongSwan VPN Client before 1.4.6, when using EAP or pre-shared keys for authenticating an IKEv2 connection, does not enforce server authentication restrictions until the entire authentication process is complete, which allows remote servers to obtain credentials by using a valid certificate and then reading the responses.
Affected products
No data.
Configuration 1
- ≤ 1.4.5
Configuration 2
- 14.04
- 14.10
- 15.04
- 8.0
Configuration 3
- 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
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 IKEv2.
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:H/Au:N/C:P/I:N/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 3, 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 (13 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 2.03% (0.02028) | 80.34th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.03% (0.02028) | 78.43th | v5 (v2026.06.15) |
| Mar 30, 2025 | 1.26% (0.01255) | 77.52th | v4 (v2025.03.14) |
| Mar 29, 2025 | 2.43% (0.02426) | 75.17th | v4 (v2025.03.14) |
| Mar 17, 2025 | 1.26% (0.01255) | 78.00th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.49% (0.00489) | 76.86th | v3 (v2023.03.01) |
| Jul 4, 2024 | 0.49% (0.00489) | 76.25th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.44% (0.00437) | 73.99th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.44% (0.00437) | 70.72th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.54% (0.01537) | 74.52th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.54% (0.01537) | 74.48th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.54% (0.01537) | 72.41th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.54% (0.01537) | 51.33th | v2 (v2022.01.01) |
References (16)
- http://lists.opensuse.org/opensuse-updates/2015-06/msg00040.html vendor-advisoryx_refsource_SUSE
- http://www.debian.org/security/2015/dsa-3282 vendor-advisoryx_refsource_DEBIANPatch
- http://www.openwall.com/lists/oss-security/2015/05/29/6 mailing-listx_refsource_MLIST
- http://www.openwall.com/lists/oss-security/2015/05/29/7 mailing-listx_refsource_MLIST
- http://www.openwall.com/lists/oss-security/2015/06/08/4 mailing-listx_refsource_MLIST
- http://www.securityfocus.com/bid/74933 vdb-entryx_refsource_BID
- http://www.securitytracker.com/id/1032514 vdb-entryx_refsource_SECTRACK
- http://www.ubuntu.com/usn/USN-2628-1 vendor-advisoryx_refsource_UBUNTUPatch
- https://access.redhat.com/security/cve/CVE-2015-4171 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1231178 Issue Tracking
- https://bugzilla.suse.com/show_bug.cgi?id=933591 x_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2015-4171
- https://play.google.com/store/apps/details?id=org.strongswan.android x_refsource_CONFIRMPatch
- https://www.cve.org/CVERecord?id=CVE-2015-4171
- https://www.strongswan.org/blog/2015/06/08/strongswan-vulnerability-%2528cve-2015-4171%2529.html x_refsource_CONFIRMPatchVendor Advisory
- https://www.suse.com/security/cve/CVE-2015-4171.html x_refsource_CONFIRM
Change history (0)
No recorded changes yet.