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CVE-2016-8638

29
FAUCET Score

CVE-2016-8638 describes a critical vulnerability in Ipsilon versions 2.0.1 and earlier, 1.2.0 and earlier, 1.1.1 and earlier, and 1.0.2 and earlier, allowing an unauthenticated attacker to view and terminate active user sessions. This "SAML2 multi-session vulnerability" stems from improper session tracking. With a CVSS score of 9.1 (CRITICAL), it presents a high-impact threat (confidentiality and availability) with low attack complexity and no user interaction required. While no public exploit code or active exploitation has been observed, and community discussion is minimal, the high FAUCET Risk Score of 83/100 indicates its significant potential danger.

Impacted Technologies

VendorProductVersion(s)CPE
1.0.0CPE matchmatch criteria
cpe:2.3:a:ipsilon_project:ipsilon:1.0.0:*:*:*:*:*:*:*
1.0.1CPE matchmatch criteria
cpe:2.3:a:ipsilon_project:ipsilon:1.0.1:*:*:*:*:*:*:*
1.0.2CPE matchmatch criteria
cpe:2.3:a:ipsilon_project:ipsilon:1.0.2:*:*:*:*:*:*:*
1.1.0CPE matchmatch criteria
cpe:2.3:a:ipsilon_project:ipsilon:1.1.0:*:*:*:*:*:*:*
1.1.1CPE matchmatch criteria
cpe:2.3:a:ipsilon_project:ipsilon:1.1.1:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.1CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.2
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.12%
Probability of exploitation in next 30 days
EPSS Percentile
79.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0212 is in the 69th percentile among its peer group of 36,833 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (5)

pippatch availablevia ghsa
Product: ipsilonFixed in: 2.0.2
pippatch availablevia ghsa
Product: ipsilonFixed in: 1.2.1
pippatch availablevia ghsa
Product: ipsilonFixed in: 1.1.2
pippatch availablevia ghsa
Product: ipsilonFixed in: 1.0.3
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: ipsilon-0:1.0.0-13.el7_3
View patch

Vendor Advisories (2)

pipGHSA-376m-3rm2-9jm6critical

Session Fixation in ipsilon

May 14, 2022
redhatCVE-2016-8638Important

ipsilon: DoS via logging out all open SAML2 sessions

Nov 21, 2016

References

rhn.redhat.com / errata/RHSA-2016-2809.html
bugzilla.redhat.com / show_bug.cgi
Issue TrackingThird Party Advisory
ipsilon-project.org / advisory/CVE-2016-8638.txt
Vendor Advisory
ipsilon-project.org / release/2.1.0.html
pagure.io / ipsilon/c/511fa8b7001c2f9a42301aa1d4b85aaf170a461c
PatchVendor Advisory
securityfocus.com / bid/94439
Third Party AdvisoryVDB Entry