Is CVE-2015-4171 in the CISA KEV catalog?

No. CVE-2015-4171 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2015-4171?

CVE-2015-4171 has a CVSS v2 base score of 2.6 (LOW).

What is the EPSS score for CVE-2015-4171?

CVE-2015-4171 has an EPSS score of 2.03% (79th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2015-4171?

Upgrade strongswan on debian 11 to 5.3.1-1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2015-4171

LOWEPSS 79th pctl

2.6

CVSS v2

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.

CWE-200Information Exposure

How to fix

Remediation Available

strongswanDebian

Fixed in:5.3.1-1CVE-2015-4171

strongswanUbuntu

Fixed in:5.1.2-0ubuntu2.3USN-2628-1

strongswan-ikeUbuntu

Fixed in:5.1.2-0ubuntu2.3USN-2628-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

2.03%probability of exploitation in 30 days

79thpercentile

Elevated risk: more likely to be exploited than 79% of all known CVEs.

References

Patch4

Other references8

Related Vulnerabilities

Other CWE-200 (Information Exposure) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-24919	High	8.6	100%	KEV + Ransom	-
CVE-2020-14181	Medium	5.3	100%	-	Fix
CVE-2021-34429	Medium	5.3	99%	-	Fix
CVE-2018-11409	Medium	5.3	98%	-	-
CVE-2021-41277	Critical	10.0	97%	KEV	-
CVE-2016-2183	High	7.5	96%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.