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CVE-2015-5352

16
FAUCET Score

CVE-2015-5352 describes a vulnerability in the x11_open_helper function of OpenSSH before version 6.9, specifically when ForwardX11Trusted mode is not enabled. This flaw allows remote attackers to bypass X connection access restrictions by connecting outside the intended time window. With a CVSS score of 4.3, this vulnerability is of medium severity, requiring medium attack complexity (AC:M) and potentially leading to partial integrity impact (I:P) without requiring authentication (Au:N). The attack vector is network-based (AV:N). There is no evidence of active exploitation, and no public exploit code is available in Metasploit, Nuclei, or ExploitDB. Community discussion is minimal, with only one mention, and there is no media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 6.8CPE matchmatch criteria
cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

4.3MEDIUM

AV:N/AC:M/Au:N/C:N/I:P/A:N

Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
5.45%
Probability of exploitation in next 30 days
EPSS Percentile
91.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0544 is in the 90th percentile among its peer group of 19,958 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

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

Remediation

Patch Available

Vendor Patches (2)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: openssh-0:5.3p1-117.el6
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: openssh

Vendor Advisories (1)

redhatCVE-2015-5352Moderate

openssh: XSECURITY restrictions bypass under certain conditions in ssh(1)

Jul 1, 2015

References

lists.opensuse.org / opensuse-security-announce/2015-09/msg00017.html
openwall.com / lists/oss-security/2015/07/01/10
rhn.redhat.com / errata/RHSA-2016-0741.html
anongit.mindrot.org / openssh.git/commit
cert-portal.siemens.com / productcert/pdf/ssa-412672.pdf
lists.debian.org / debian-lts-announce/2018/09/msg00010.html
security.gentoo.org / glsa/201512-04
security.netapp.com / advisory/ntap-20181023-0001
openssh.com / txt/release-6.9
Vendor Advisory
oracle.com / technetwork/topics/security/bulletinjan2016-2867206.html
oracle.com / technetwork/topics/security/linuxbulletinapr2016-2952096.html
securityfocus.com / bid/75525
securitytracker.com / id/1032797
ubuntu.com / usn/USN-2710-1
ubuntu.com / usn/USN-2710-2