CVE-2015-3240

The pluto IKE daemon in libreswan before 3.15 and Openswan before 2.6.45, when built with NSS, allows remote attackers to cause a denial of service (assertion failure and daemon restart) via a zero DH g^x value in a KE payload in a IKE packet.

Published: 2015-11-09 Last update: 2026-05-06 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2015-3240 is rated Moderate Risk (48.3/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 2.77%). EPSS rose +1.56% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2015-3240

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 1.20% 2.77% +1.56%
2 2025-06-27 1.10% 1.20% +0.11%
3 2025-03-30 — 1.10% —

Full EPSS history (11 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2015-3240

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2015-3240

OS Trackers for CVE-2015-3240

vendor priority summary link
debian unimportant CVE-2015-3240 unimportant priority: Debian including 1 source packages (libreswan), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2015-3240
gentoo normal CVE-2015-3240: 1 GLSA(s) (201603-13), 1 atom(s) (net-misc/libreswan); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2015-3240
redhat medium — https://access.redhat.com/security/cve/CVE-2015-3240
suse medium CVE-2015-3240 severity moderate: SUSE including 2 source package names (libreswan-3.15-5.el7_1, openswan), 2 product×package rows across 2 product lines (SUSE Liberty Linux 7, SUSE Linux Enterprise Server 11 SP1 for Teradata): Fixed 1, Known Not Affected 1. https://www.suse.com/security/cve/CVE-2015-3240/
ubuntu medium CVE-2015-3240 medium priority: Ubuntu including 2 source packages (libreswan, openswan), 24 status rows across 12 suites (artful, bionic, cosmic, disco, precise, trusty, upstream, vivid, wily, xenial, yakkety, zesty): DNE 16, not-affected 5, released 2, ignored 1. https://ubuntu.com/security/CVE-2015-3240

Affected software / configurations for CVE-2015-3240

Vendor Product Version Raw CPE
libreswan libreswan 3.14 cpe:2.3:a:libreswan:libreswan:3.14:*:*:*:*:*:*:*

References for CVE-2015-3240

cvelogic Threat Intelligence