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CVE-2015-4171

15
FAUCET Score

CVE-2015-4171 describes a vulnerability in strongSwan versions 4.3.0 through 5.x before 5.3.2 and strongSwan VPN Client before 1.4.6. This flaw allows remote servers to obtain user credentials during IKEv2 connections authenticated via EAP or pre-shared keys, due to a failure to enforce server authentication restrictions until the entire process is complete. The vulnerability has a low severity CVSS score of 2.6 (AV:N/AC:H/Au:N/C:P/I:N/A:N), indicating network access, high attack complexity, no authentication required, and a potential for partial confidentiality impact. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.4.5CPE matchmatch criteria
cpe:2.3:a:strongswan:strongswan_vpn_client:*:*:*:*:*:android:*:*
14.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
14.10CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:14.10:*:*:*:*:*:*:*
15.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:15.04:*:*:*:*:*:*:*
8.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

2.6LOW

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

Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
HIGH
Authentication
NONE
Exploitability Score
4.9
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
2.03%
Probability of exploitation in next 30 days
EPSS Percentile
79.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0203 is in the 73rd percentile among its peer group of 1,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.3 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

debianpatch availablevia nvd_reference
View patch
ubuntupatch availablevia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2015-4171Low

strongswan: rogue servers are able to gain user credentials from a client in certain IKEv2 setups

Jun 8, 2015

References

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