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CVE-2015-5600

30
FAUCET Score

CVE-2015-5600 describes a vulnerability in OpenSSH through version 6.9, specifically within the kbdint_next_device function in sshd. This flaw allows remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumption) by exploiting improper restrictions on keyboard-interactive device processing. The vulnerability carries a high CVSS score of 8.5 (AV:N/AC:L/Au:N/C:P/I:N/A:C), indicating it can be exploited remotely with low complexity and can lead to partial confidentiality impact and complete availability impact. While there is no known active exploitation (KEV) or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community discussion and media coverage, suggesting awareness within the security community.

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

8.5HIGH

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

Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
COMPLETE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
7.8
CvssVersion
2.0

Exploit Intelligence

EPSS Score
9.38%
Probability of exploitation in next 30 days
EPSS Percentile
94.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0938 is in the 75th percentile among its peer group of 8,920 CVEs.

Social Chatter

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

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 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-0:5.3p1-114.el6_7
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-2015-5600Low

openssh: MaxAuthTries limit bypass via duplicates in KbdInteractiveDevices

Jul 16, 2015

References

cvsweb.openbsd.org / cgi-bin/cvsweb/src/usr.bin/ssh/auth2-chall.c
cvsweb.openbsd.org / cgi-bin/cvsweb/src/usr.bin/ssh/auth2-chall.c.diff
kb.juniper.net / InfoCenter/index
lists.apple.com / archives/security-announce/2015/Aug/msg00001.html
lists.fedoraproject.org / pipermail/package-announce/2015-August/165170.html
lists.fedoraproject.org / pipermail/package-announce/2015-July/162955.html
lists.opensuse.org / opensuse-security-announce/2015-09/msg00017.html
openwall.com / lists/oss-security/2015/07/23/4
rhn.redhat.com / errata/RHSA-2016-0466.html
cert-portal.siemens.com / productcert/pdf/ssa-412672.pdf
seclists.org / fulldisclosure/2015/Jul/92
Exploit
h20564.www2.hpe.com / portal/site/hpsc/public/kb/docDisplay
h20566.www2.hpe.com / portal/site/hpsc/public/kb/docDisplay
h20566.www2.hpe.com / portal/site/hpsc/public/kb/docDisplay
kc.mcafee.com / corporate/index
kc.mcafee.com / corporate/index
lists.debian.org / debian-lts-announce/2018/09/msg00010.html
security.gentoo.org / glsa/201512-04
security.netapp.com / advisory/ntap-20151106-0001
support.apple.com / kb/HT205031
arista.com / en/support/advisories-notices/security-advisories/1174-security-advisory-12
oracle.com / technetwork/security-advisory/cpujul2016-2881720.html
oracle.com / technetwork/security-advisory/cpujul2018-4258247.html
oracle.com / technetwork/topics/security/bulletinoct2015-2511968.html
oracle.com / technetwork/topics/security/linuxbulletinapr2016-2952096.html
oracle.com / technetwork/topics/security/linuxbulletinoct2015-2719645.html
oracle.com / technetwork/topics/security/ovmbulletinjul2016-3090546.html
securityfocus.com / bid/75990
securityfocus.com / bid/91787
securityfocus.com / bid/92012
securitytracker.com / id/1032988
ubuntu.com / usn/USN-2710-1
ubuntu.com / usn/USN-2710-2