CVE-2016-5361 Denial of service in n/a
Remote attackers can cause denial of service via traffic amplification using spoofed UDP packets in libreswan IPsec implementation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2016-5361?
CVE-2016-5361 is a high-severity denial of service vulnerability in n/a, published on 16 Jun 2016. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-20
Which versions are affected by CVE-2016-5361?
It affects 1 product.
Linux distribution packages (6)
libreswan Red Hat:enterprise_linux:7::client | All versions | 0:3.15-8.el7 |
libreswan-debuginfo Red Hat:enterprise_linux:7::client | All versions | 0:3.15-8.el7 |
libreswan Red Hat:enterprise_linux:7::server | All versions | 0:3.15-8.el7 |
libreswan-debuginfo Red Hat:enterprise_linux:7::server | All versions | 0:3.15-8.el7 |
libreswan Red Hat:enterprise_linux:7::workstation | All versions | 0:3.15-8.el7 |
libreswan-debuginfo Red Hat:enterprise_linux:7::workstation | All versions | 0:3.15-8.el7 |
Products include Libreswan Libreswan.
How do I fix CVE-2016-5361?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2016-5361 being exploited?
There is no known exploitation of CVE-2016-5361 in the wild and no public exploit code.
Other vulnerabilities in n/a
- CVE-2013-7283 Race condition in n/a
- CVE-2026-12413 IKEv2 Denial of Service via malformed fragmentation
- CVE-2026-50721 IKEv1 Denial of Service via RSA-SHA1 (PKCS#1 Version 1.5 Encrypted) authentication payload
- CVE-2026-50722 IKEv2 Denial of Service via RSA-SHA1 (PKCS#1 RSASSA-PKCS1-v1_5) authentication payload
- CVE-2023-30570 Denial of service in n/a
Sources
Also known as GHSA-pvgh-6wjg-x887, RHSA-2016:2603.