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Fencer Intel
medium 4.3

CVE-2015-3240 json

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…

published 2015-11-09 11 y ago modified 2026-06-17 4 mo ago also EUVD-2015-3296

cvss
4.3
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.8%
EPSS 2.8% chance of exploitation in 30 days, percentile 86%
public exploits
0
none known

Summary

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.

Patch / fix

  • libreswan RHEL 7 3.15-5.el7_1
  • libreswan RHEL 7 3.15-5.ael7b_1

red hat advisories RHSA-2015:1979

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2015-3240 updated cvss 5.0

openswan: denial of service via IKE daemon restart when receiving a bad DH gx value

  • Red Hat Enterprise Linux 5 openswan Red Hat Enterprise Linux 6 openswan
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux Client (v. 7) libreswan 3.15-5.el7_1 Red Hat Enterprise Linux Server (v. 7) libreswan 3.15-5.el7_1, libreswan 3.15-5.ael7b_1 Red Hat Enterprise Linux Workstation (v. 7) libreswan 3.15-5.el7_1
    fixed: vendor fix RHSA-2015:1979

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.79% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.