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CVE-2016-5361

24
FAUCET Score

CVE-2016-5361 is a denial-of-service vulnerability affecting LibreSwan versions prior to 3.17. It allows remote attackers to cause traffic amplification by sending a spoofed UDP packet, exploiting the retransmission behavior in initial-responder states of the IKEv1 protocol. Rated as high severity (CVSS 7.5), this vulnerability requires no user interaction and can be exploited over the network, leading to a complete loss of availability. There is no known active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 3.16CPE matchmatch criteria
cpe:2.3:a:libreswan:libreswan:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.77%
Probability of exploitation in next 30 days
EPSS Percentile
84.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0277 is in the 73rd percentile among its peer group of 51,466 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (6)

github_advisorypatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: libreswan-0:3.15-8.el7
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: ipsec-tools
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: openswan
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: libreswan
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: openswan

Vendor Advisories (1)

redhatCVE-2016-5361Moderate

IKEv1 protocol is vulnerable to DoS amplification attack

Mar 14, 2016

References

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