What’s Vulnerable › Vulnerabilities

CVE-2015-8023

• Severity: medium (CVSS 5.0 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2015-11-18 · updated 2026-06-17
• Weakness: CWE-20

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

• Canonical Ubuntu Linux: 14.04, 15.04, 15.10
• strongSwan: 4.2.12, 4.2.13, 4.2.14, 4.2.15, 4.2.16, 4.3.0 (+35)

References

• http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00025.html
• http://lists.opensuse.org/opensuse-updates/2015-11/msg00139.html
• http://www.debian.org/security/2015/dsa-3398
• http://www.securityfocus.com/bid/84947
• http://www.ubuntu.com/usn/USN-2811-1
• https://www.strongswan.org/blog/2015/11/16/strongswan-vulnerability-%28cve-2015-8023%29.html
• http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00025.html
• http://lists.opensuse.org/opensuse-updates/2015-11/msg00139.html
• http://www.debian.org/security/2015/dsa-3398
• http://www.securityfocus.com/bid/84947
• http://www.ubuntu.com/usn/USN-2811-1
• https://www.strongswan.org/blog/2015/11/16/strongswan-vulnerability-%28cve-2015-8023%29.html

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