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CVE-2015-8023

20
FAUCET Score

CVE-2015-8023 describes an authentication bypass vulnerability in the EAP-MSCHAPv2 protocol implementation within strongSwan versions 4.2.12 through 5.3.3. This flaw allows remote attackers to bypass authentication by sending an empty Success message in response to an initial Challenge. Rated with a CVSS score of 5.0 (AV:N/AC:L/Au:N/C:N/I:P/A:N), it indicates a network-exploitable vulnerability with low attack complexity, resulting in a partial integrity impact (authentication bypass) without affecting confidentiality or availability. 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
14.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
15.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:15.04:*:*:*:*:*:*:*
15.10CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:15.10:*:*:*:*:*:*:*
4.2.12CPE matchmatch criteria
cpe:2.3:a:strongswan:strongswan:4.2.12:*:*:*:*:*:*:*
4.2.13CPE matchmatch criteria
cpe:2.3:a:strongswan:strongswan:4.2.13:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

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

Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
2.58%
Probability of exploitation in next 30 days
EPSS Percentile
83.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0258 is in the 76th percentile among its peer group of 23,705 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 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

Vendor Advisories (1)

redhatCVE-2015-8023Important

strongswan: Authentication bypass in eap-mschapv2 plugin

Nov 16, 2015

References

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