What’s Vulnerable › Vulnerabilities

CVE-2016-5361

• Severity: high (CVSS 7.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2016-06-16 · updated 2026-06-17
• Weakness: CWE-20

Description

programs/pluto/ikev1.c in libreswan before 3.17 retransmits in initial-responder states, which allows remote attackers to cause a denial of service (traffic amplification) via a spoofed UDP packet. NOTE: the original behavior complies with the IKEv1 protocol, but has a required security update from the libreswan vendor; as of 2016-06-10, it is expected that several other IKEv1 implementations will have vendor-required security updates, with separate CVE IDs assigned to each.

Affected products

• The Libreswan Project libreswan: through 3.16

References

• http://rhn.redhat.com/errata/RHSA-2016-2603.html
• http://www.openwall.com/lists/oss-security/2016/06/10/4
• https://github.com/libreswan/libreswan/commit/152d6d95632d8b9477c170f1de99bcd86d7fb1d6
• https://lists.libreswan.org/pipermail/swan-dev/2016-March/001394.html
• http://rhn.redhat.com/errata/RHSA-2016-2603.html
• http://www.openwall.com/lists/oss-security/2016/06/10/4
• https://github.com/libreswan/libreswan/commit/152d6d95632d8b9477c170f1de99bcd86d7fb1d6
• https://lists.libreswan.org/pipermail/swan-dev/2016-March/001394.html

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