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CVE-2015-3204

15
FAUCET Score

CVE-2015-3204 describes a denial-of-service vulnerability affecting Libreswan versions 3.9 through 3.12. Remote attackers can exploit this by sending specially crafted IKEv1 packets, either with unassigned bits set in the IPSEC DOI value or with the next payload value set to ISAKMP_NEXT_SAK, causing the daemon to restart. With a CVSS score of 5.0, this vulnerability is rated as medium severity, indicating a low attack complexity and no authentication required, but only impacts 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
3.9CPE matchmatch criteria
cpe:2.3:a:libreswan:libreswan:3.9:*:*:*:*:*:*:*
3.10CPE matchmatch criteria
cpe:2.3:a:libreswan:libreswan:3.10:*:*:*:*:*:*:*
3.11CPE matchmatch criteria
cpe:2.3:a:libreswan:libreswan:3.11:*:*:*:*:*:*:*
3.12CPE matchmatch criteria
cpe:2.3:a:libreswan:libreswan:3.12:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

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

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

Exploit Intelligence

EPSS Score
2.60%
Probability of exploitation in next 30 days
EPSS Percentile
83.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0260 is in the 76th percentile among its peer group of 23,723 CVEs.

Social Chatter

No social media mentions found for this CVE.

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

Patch Available

Vendor Patches (1)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: libreswan-0:3.12-10.1.el7_1
View patch

Vendor Advisories (1)

redhatCVE-2015-3204Moderate

libreswan: crafted IKE packet causes daemon restart

Jun 1, 2015

References

rhn.redhat.com / errata/RHSA-2015-1154.html
libreswan.org / security/CVE-2015-3204/CVE-2015-3204.txt
Vendor Advisory
security.gentoo.org / glsa/201603-13
securityfocus.com / bid/75392