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Vulnerability details: VCID-56eh-f8cn-aaaj
Vulnerability ID VCID-56eh-f8cn-aaaj
Aliases CVE-2015-5600
Summary The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH through 6.9 does not properly restrict the processing of keyboard-interactive devices within a single connection, which makes it easier for remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumption) via a long and duplicative list in the ssh -oKbdInteractiveDevices option, as demonstrated by a modified client that provides a different password for each pam element on this list.
Status Published
Exploitability 0.5
Weighted Severity 7.7
Risk 3.9
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-264 Permissions, Privileges, and Access Controls
CWE-304 Missing Critical Step in Authentication
System Score Found at
generic_textual Low http://people.canonical.com/~ubuntu-security/cve/2015/CVE-2015-5600.html
rhas Moderate https://access.redhat.com/errata/RHSA-2015:2088
rhas Moderate https://access.redhat.com/errata/RHSA-2016:0466
epss 0.33752 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.33752 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.33752 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.33752 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.33752 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.33752 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.33752 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.33752 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.33752 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.36266 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.36266 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.36266 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.36266 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.36266 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.36266 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.36266 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.36266 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.36266 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.36266 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.36266 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.36266 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.36266 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.40121 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
epss 0.44306 https://api.first.org/data/v1/epss?cve=CVE-2015-5600
rhbs low https://bugzilla.redhat.com/show_bug.cgi?id=1245969
generic_textual Low https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-5600
generic_textual Low http://seclists.org/fulldisclosure/2015/Jul/92
generic_textual Low https://kingcope.wordpress.com/2015/07/16/openssh-keyboard-interactive-authentication-brute-force-vulnerability-maxauthtries-bypass/
cvssv2 8.5 https://nvd.nist.gov/vuln/detail/CVE-2015-5600
generic_textual Medium https://ubuntu.com/security/notices/USN-2710-1
cvssv3.1 9.8 http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
generic_textual CRITICAL http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
cvssv3.1 9.8 http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
generic_textual CRITICAL http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
cvssv3.1 7.5 http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html
generic_textual MODERATE http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html
cvssv3.1 8.8 http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
generic_textual HIGH http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
generic_textual HIGH http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
Reference id Reference type URL
http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/auth2-chall.c
http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/auth2-chall.c.diff?r1=1.42&r2=1.43&f=h
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10697
http://lists.apple.com/archives/security-announce/2015/Aug/msg00001.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-August/165170.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-July/162955.html
http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00017.html
http://openwall.com/lists/oss-security/2015/07/23/4
http://people.canonical.com/~ubuntu-security/cve/2015/CVE-2015-5600.html
http://rhn.redhat.com/errata/RHSA-2016-0466.html
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2015-5600.json
https://api.first.org/data/v1/epss?cve=CVE-2015-5600
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-5600
http://seclists.org/fulldisclosure/2015/Jul/92
https://h20564.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04952480
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05128992
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05157667
https://kc.mcafee.com/corporate/index?page=content&id=SB10136
https://kc.mcafee.com/corporate/index?page=content&id=SB10157
https://kingcope.wordpress.com/2015/07/16/openssh-keyboard-interactive-authentication-brute-force-vulnerability-maxauthtries-bypass/
https://lists.debian.org/debian-lts-announce/2018/09/msg00010.html
https://security.gentoo.org/glsa/201512-04
https://security.netapp.com/advisory/ntap-20151106-0001/
https://support.apple.com/kb/HT205031
https://ubuntu.com/security/notices/USN-2710-1
https://www.arista.com/en/support/advisories-notices/security-advisories/1174-security-advisory-12
http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html
http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
http://www.securityfocus.com/bid/75990
http://www.securityfocus.com/bid/91787
http://www.securityfocus.com/bid/92012
http://www.securitytracker.com/id/1032988
http://www.ubuntu.com/usn/USN-2710-1
http://www.ubuntu.com/usn/USN-2710-2
1245969 https://bugzilla.redhat.com/show_bug.cgi?id=1245969
793616 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=793616
cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*
CVE-2015-5600 https://nvd.nist.gov/vuln/detail/CVE-2015-5600
RHSA-2015:2088 https://access.redhat.com/errata/RHSA-2015:2088
RHSA-2016:0466 https://access.redhat.com/errata/RHSA-2016:0466
USN-2710-1 https://usn.ubuntu.com/2710-1/
No exploits are available.
Vector: AV:N/AC:L/Au:N/C:P/I:N/A:C Found at https://nvd.nist.gov/vuln/detail/CVE-2015-5600
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.96712
EPSS Score 0.33752
Published At June 9, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
There are no relevant records.