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CVE-2015-6564

18
FAUCET Score

CVE-2015-6564 is a use-after-free vulnerability in OpenSSH before version 7.0 on non-OpenBSD platforms, specifically within the sshd monitor.c component. This flaw could allow local users to gain privileges by manipulating the sshd uid to send an early MONITOR_REQ_PAM_FREE_CTX request. With a CVSS score of 6.9, it represents a high-severity local attack requiring medium complexity, potentially leading to complete compromise of confidentiality, integrity, and availability. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 6.9CPE matchmatch criteria
cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

6.9MEDIUM

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

Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
Access Vector
LOCAL
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
3.4
Impact Score
10.0
CvssVersion
2.0

Exploit Intelligence

EPSS Score
0.60%
Probability of exploitation in next 30 days
EPSS Percentile
45.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0060 is in the 84th percentile among its peer group of 1,525 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, 0.1 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 0.4 InfoSec Media, 0.1 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: openssh-0:5.3p1-117.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: openssh-0:6.6.1p1-22.el7
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: openssh
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: openssh

Vendor Advisories (1)

redhatCVE-2015-6564Moderate

openssh: Use-after-free bug related to PAM support

Aug 11, 2015

References

lists.fedoraproject.org / pipermail/package-announce/2015-August/165170.html
lists.opensuse.org / opensuse-security-announce/2015-09/msg00017.html
rhn.redhat.com / errata/RHSA-2016-0741.html
cert-portal.siemens.com / productcert/pdf/ssa-412672.pdf
seclists.org / fulldisclosure/2015/Aug/54
github.com / openssh/openssh-portable/commit/5e75f5198769056089fb06c4d738ab0e5abc66f7
kc.mcafee.com / corporate/index
lists.debian.org / debian-lts-announce/2018/09/msg00010.html
security.gentoo.org / glsa/201512-04
broadcom.com / support/fibre-channel-networking/security-advisories/brocade-security-advisory-2019-764
openssh.com / txt/release-7.0
Vendor Advisory
openwall.com / lists/oss-security/2015/08/22/1
oracle.com / technetwork/topics/security/bulletinjan2016-2867206.html
oracle.com / technetwork/topics/security/linuxbulletinapr2016-2952096.html
oracle.com / technetwork/topics/security/linuxbulletinoct2015-2719645.html
securityfocus.com / bid/76317