← Vulnerability feed

Vulnerability record · CVE-2015-4171 · published 10 June 2015

CVE-2015-4171: Strongswan vpn client information exposure vulnerability

Strongswan · Strongswan Vpn Client

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.

2.6 CVSS 2.0 Low EPSS 2.0% · top 19.3% CWE-200 · Information exposure
2.6CVSS 2.0 base score
2.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
24References
17 Jun 2026Last modified by NVD

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.

AV:N/AC:H/Au:N/C:P/I:N/A:N

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-updates/2015-06/msg00040.html
http://www.debian.org/security/2015/dsa-3282 Patch
http://www.openwall.com/lists/oss-security/2015/05/29/6
http://www.openwall.com/lists/oss-security/2015/05/29/7
http://www.openwall.com/lists/oss-security/2015/06/08/4
http://www.securityfocus.com/bid/74933
http://www.securitytracker.com/id/1032514
http://www.ubuntu.com/usn/USN-2628-1 Patch
https://bugzilla.suse.com/show_bug.cgi?id=933591
https://play.google.com/store/apps/details?id=org.strongswan.android Patch
https://www.strongswan.org/blog/2015/06/08/strongswan-vulnerability-%2528cve-2015-4171%2529.html PatchVendor Advisory
https://www.suse.com/security/cve/CVE-2015-4171.html
http://lists.opensuse.org/opensuse-updates/2015-06/msg00040.html
http://www.debian.org/security/2015/dsa-3282 Patch
http://www.openwall.com/lists/oss-security/2015/05/29/6
http://www.openwall.com/lists/oss-security/2015/05/29/7
http://www.openwall.com/lists/oss-security/2015/06/08/4
http://www.securityfocus.com/bid/74933
http://www.securitytracker.com/id/1032514
http://www.ubuntu.com/usn/USN-2628-1 Patch
https://bugzilla.suse.com/show_bug.cgi?id=933591
https://play.google.com/store/apps/details?id=org.strongswan.android Patch
https://www.strongswan.org/blog/2015/06/08/strongswan-vulnerability-%2528cve-2015-4171%2529.html PatchVendor Advisory
https://www.suse.com/security/cve/CVE-2015-4171.html

Track CVE-2015-4171 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2025-32433Erlang/OTP SSH server missing authentication allows remote code executionErlang/OTP SSH servers before OTP-27.3.3, OTP-26.2.5.11 and OTP-25.3.2.20 mishandle SSH protocol messages, letting an unauthenticated attacker execut…KEVEPSS 99%analysed10.0CVE-2025-24201Apple WebKit out-of-bounds write allows sandbox escapeCVE-2025-24201 is an out-of-bounds write in Apple's WebKit that was addressed with improved checks. Maliciously crafted web content may break out of …KEVEPSS 3.8%analysed10.0CVE-2021-44228Apache Log4j2 JNDI lookup remote code executionApache Log4j2 versions 2.0-beta9 through 2.15.0 (excluding 2.12.2, 2.12.3, and 2.3.1) do not protect against attacker-controlled LDAP and other JNDI …KEVEPSS 100%analysed10.0CVE-2015-3306ProFTPD mod_copy arbitrary file read and writeThe mod_copy module in ProFTPD 1.3.5 fails to restrict the SITE CPFR and SITE CPTO commands, letting remote attackers copy arbitrary files on the ser…KEVEPSS 99%analysed9.8CVE-2026-24061GNU Inetutils telnetd argument injection allows remote auth bypasstelnetd in GNU Inetutils through 2.7 fails to sanitize the USER environment variable, so a value such as "-f root" is passed as an argument to login …KEVEPSS 99%analysed9.8CVE-2025-39682Linux kernel TLS zero-length record handling flaw on rx_listThe Linux kernel TLS receive path mishandles zero-length records that arrive from the rx_list, breaking the assumption that a record type change cann…KEVEPSS 2.9%analysed9.8CVE-2025-24813Apache Tomcat Default Servlet path equivalence enables RCE and file disclosureApache Tomcat mishandles path equivalence for names containing an internal dot, letting a remote unauthenticated attacker write files through the Def…KEVEPSS 100%analysed9.8CVE-2024-9680Mozilla Firefox and Thunderbird use-after-free in Animation timelinesA use-after-free flaw in Animation timelines allows an attacker to execute code in the content process of Firefox and Thunderbird. Mozilla reports ex…KEVEPSS 23%analysed

Source: NIST National Vulnerability Database (record CVE-2015-4171), CISA KEV, FIRST EPSS (scores of 2026-10-16). This page is refreshed as NVD updates the record.