What is CVE-2015-3204?

CVE-2015-3204 is a vulnerability in Libreswan, classified under Improper Input Validation. Published 2015-07-01.

Is CVE-2015-3204 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Improper input validation in Libreswan

CVE-2015-3204

libreswan 3.9 through 3.12 allows remote attackers to cause a denial of service (daemon restart) via an IKEv1 packet with (1) unassigned bits set in the IPSEC DOI value or (2) the next payload value set to ISAKMP_NEXT_SAK.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2015-07-01 · last modified 2026-06-17.

CVSS v2 metric

CVSS v2 base score 5.0 (Medium). Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.026 (84.9th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 85th percentile — 84.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.026 · newest: 0.026 · change: 0.000

Affected products

Libreswan — versions 3.9, 3.10, 3.11

Weakness classification (CWE)

CWE-20 — Improper Input Validation

Public proof-of-concept exploits

Live-Hack-CVE/CVE-2015-3204

References

libreswan.org/security/CVE-2015-3204/CVE-2015-3204.txt (Vendor Advisory)
rhn.redhat.com/errata/RHSA-2015-1154.html (vendor-advisory)
security.gentoo.org/glsa/201603-13 (vendor-advisory)
www.securityfocus.com/bid/75392 (vdb-entry)

Frequently asked questions

What is CVE-2015-3204?: CVE-2015-3204 is a vulnerability in Libreswan, classified under Improper Input Validation. Published 2015-07-01.
Is CVE-2015-3204 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.