CVE-2015-5600
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
02 Description
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
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
- Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
- EPSS probability
- 9.37% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 94.9% of scored records. A rank, not a probability.
- NVD base score
- 8.1 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Low. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2015-08-03 00:00Z11 YR AGO
- Last updated
- 2026-05-27 16:31Z5 MO AGO
- Reserved
- 2015-07-20
- Assigning CNA
- mitre
- Record state
- PUBLISHED
- Severity
- High (CVSS 8.1)
- CNA CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weaknesses
- Data version
- 5.2
- Document digest
- 94f448490cae0d4449c15c016c6d3f6ae9e78191f8cec7b10ff1b42d0f6acb26
05 Affected products
06 References
- www.oracle.comhttp://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
- www.ubuntu.comUSN-2710-2http://www.ubuntu.com/usn/USN-2710-2
- lists.fedoraproject.orgFEDORA-2015-13469http://lists.fedoraproject.org/pipermail/package-announce/2015-August/165170.html
- www.oracle.comhttp://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
- h20566.www2.hpe.comhttps://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05157667
- h20566.www2.hpe.comhttps://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05128992
- www.oracle.comhttp://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
- www.oracle.comhttp://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
- security.gentoo.orgGLSA-201512-04https://security.gentoo.org/glsa/201512-04
- kc.mcafee.comhttps://kc.mcafee.com/corporate/index?page=content&id=SB10136
- security.netapp.comhttps://security.netapp.com/advisory/ntap-20151106-0001/
- rhn.redhat.comRHSA-2016:0466http://rhn.redhat.com/errata/RHSA-2016-0466.html
- cvsweb.openbsd.orghttp://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/auth2-chall.c.diff?r1=1.42&r2=1.43&f=h
- www.oracle.comhttp://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
- kb.juniper.nethttp://kb.juniper.net/InfoCenter/index?page=content&id=JSA10697
- lists.apple.comAPPLE-SA-2015-08-13-2http://lists.apple.com/archives/security-announce/2015/Aug/msg00001.html
- cvsweb.openbsd.orghttp://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/auth2-chall.c
- kc.mcafee.comhttps://kc.mcafee.com/corporate/index?page=content&id=SB10157
- www.securityfocus.com75990http://www.securityfocus.com/bid/75990
- www.securityfocus.com91787http://www.securityfocus.com/bid/91787
- h20564.www2.hpe.comhttps://h20564.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04952480
- lists.opensuse.orgSUSE-SU-2015:1581http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00017.html
- www.securityfocus.com92012http://www.securityfocus.com/bid/92012
- support.apple.comhttps://support.apple.com/kb/HT205031
- lists.debian.org[debian-lts-announce] 20180910 [SECURITY] [DLA 1500-1] openssh security updatehttps://lists.debian.org/debian-lts-announce/2018/09/msg00010.html
- openwall.com[oss-security] 20150723 Re: CVE Request for OpenSSH vulnerability - authentication limits bypasshttp://openwall.com/lists/oss-security/2015/07/23/4
- www.ubuntu.comUSN-2710-1http://www.ubuntu.com/usn/USN-2710-1
- lists.fedoraproject.orgFEDORA-2015-11981http://lists.fedoraproject.org/pipermail/package-announce/2015-July/162955.html
- www.securitytracker.com1032988http://www.securitytracker.com/id/1032988
- seclists.org20150717 OpenSSH keyboard-interactive authentication brute force vulnerability (MaxAuthTries bypass)http://seclists.org/fulldisclosure/2015/Jul/92
- www.oracle.comhttp://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html
- www.arista.comhttps://www.arista.com/en/support/advisories-notices/security-advisories/1174-security-advisory-12
- cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
07 Fixed in
Debian 12
- openssh Fixed in 1:6.9p1-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- openssh Fixed in 1:6.9p1-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- openssh Fixed in 1:6.9p1-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 14.04 LTS
- openssh Fixed in 1:6.6p1-2ubuntu2.2
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.