CVE-2016-10396

The racoon daemon in IPsec-Tools 0.8.2 contains a remotely exploitable computational-complexity attack when parsing and storing ISAKMP fragments. The implementation permits a remote attacker to exhaust computational resources on the remote endpoint by repeatedly sending ISAKMP fragment packets in a particular order such that the worst-case computational complexity is realized in the algorithm utilized to determine if reassembly of the fragments can take place.

Published: 2017-07-06 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2016-10396 is rated Moderate Risk (60.7/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.93%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2016-10396

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 2.08% 2.93% +0.85%
2 2025-11-19 1.79% 2.08% +0.29%
3 2025-06-19 — 1.79% —

Full EPSS history (11 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2016-10396

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
7.8 2.0 HIGH
AV:N/AC:L/Au:N/C:N/I:N/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:C)
Complete availability impact.
 10.0 6.9 [email protected]

Weakness enumeration for CVE-2016-10396

OS Trackers for CVE-2016-10396

vendor priority summary link
redhat medium — https://access.redhat.com/security/cve/CVE-2016-10396
suse medium CVE-2016-10396 severity moderate: SUSE including 4 source package names (ipsec-tools, ipsec-tools-0.7.3-1.38.3.1, ipsec-tools-0.8.0-19.3.1, ipsec-tools-0.8.2-5.35), 35 product×package rows across 34 product lines (SUSE CaaS Platform 4.0, SUSE Enterprise Storage 6, … (34 product lines)): Fixed 21, Known Not Affected 14. https://www.suse.com/security/cve/CVE-2016-10396/
ubuntu medium CVE-2016-10396 medium priority: Ubuntu including 1 source packages (ipsec-tools), 20 status rows across 20 suites (artful, bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, jammy, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial, yakkety, zesty): DNE 12, released 4, ignored 2, needed 1, needs-triage 1. https://ubuntu.com/security/CVE-2016-10396

Affected software / configurations for CVE-2016-10396

Vendor Product Version Raw CPE
ipsec-tools ipsec-tools 0.8.2 cpe:2.3:a:ipsec-tools:ipsec-tools:0.8.2:*:*:*:*:*:*:*

References for CVE-2016-10396

cvelogic Threat Intelligence