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CVE-2016-0721

21
FAUCET Score

CVE-2016-0721 describes a session fixation vulnerability in pcsd, affecting pcs versions prior to 0.9.157 across various distributions including ClusterLabs, Fedora, and Red Hat Enterprise Linux. This flaw allows an attacker to potentially hijack a user's session by fixing the session ID, leading to unauthorized access. With a CVSS v3 score of 8.1 (High), this vulnerability can be exploited remotely with low attack complexity, resulting in high confidentiality and integrity impacts. There is currently no evidence of active exploitation, publicly available exploit code in Metasploit or ExploitDB, nor significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 0.9.156CPE matchmatch criteria
cpe:2.3:a:clusterlabs:pcs:*:*:*:*:*:*:*:*
22CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:22:*:*:*:*:*:*:*
23CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:23:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

8.1HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
5.2
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.29%
Probability of exploitation in next 30 days
EPSS Percentile
81.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0229 is in the 80th percentile among its peer group of 14,855 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 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 0.1 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

github_advisorypatch availablevia nvd_reference
View patch
redhatpatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: pcs-0:0.9.152-10.el7
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: pcs

Vendor Advisories (1)

redhatCVE-2016-0721Moderate

pcs: cookies are not invalidated upon logout

Feb 16, 2016

References

lists.fedoraproject.org / pipermail/package-announce/2016-March/178261.html
Third Party Advisory
lists.fedoraproject.org / pipermail/package-announce/2016-March/178384.html
Third Party Advisory
rhn.redhat.com / errata/RHSA-2016-2596.html
Third Party Advisory
bugzilla.redhat.com / show_bug.cgi
Issue TrackingPatchThird Party Advisory
github.com / ClusterLabs/pcs/commit/acdbbe8307e6f4a36b2c7754765e732e43fe8d17
Patch
github.com / ClusterLabs/pcs/commit/bc6ad9086857559db57f4e3e6de66762291c0774
Patch
github.com / ClusterLabs/pcs/commit/e9b28833d54a47ec441f6dbad0db96e1fc662a5b
Patch
securityfocus.com / bid/97977
Third Party AdvisoryVDB Entry