How severe is CVE-2015-3240?

CVE-2015-3240 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2015-3240 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-3240?

CVE-2015-3240 affects Libreswan. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2015-3240?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2015-3240 published?

CVE-2015-3240 was published on 2015-11-09 and last updated on 2026-06-17.

CVE-2015-3240

CVE-2015-3240 is a medium-severity vulnerability in Libreswan with a CVSS 2.0 base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-189.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 3% (85th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-189
Affected product: Libreswan
Published: 2015-11-09
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2015-3240?: CVE-2015-3240 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2015-3240 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-3240?: CVE-2015-3240 affects Libreswan. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2015-3240?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2015-3240 published?: CVE-2015-3240 was published on 2015-11-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:libreswan:libreswan:3.14:*:*:*:*:*:*:*

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