HOME VULNERABILITIESCVE-2016-0777

MEDIUM

CVE-2016-0777

CWE-200Published: January 14, 2016· Updated: Jun 17, 2026

6.5

CVSS v3.1

Official Description

The resend_bytes function in roaming_common.c in the client in OpenSSH 5.x, 6.x, and 7.x before 7.1p2 allows remote servers to obtain sensitive information from process memory by requesting transmission of an entire buffer, as demonstrated by reading a private key.

Technical Analysis

CVE-2016-0777 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 6.5.

From a weakness classification perspective (CWE-200): Information exposure vulnerabilities leak sensitive data to unauthorized actors.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.Low

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected Vendors & Products

Apple1 product(s)

mac os x

HP1 product(s)

remote device access virtual customer access system

openbsd1 product(s)

openssh

Oracle2 product(s)

linuxsolaris

sophos2 product(s)

unified threat management softwareunified threat management

Source: NVD CPE · 35 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

CVE Program entry

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttp://kb.juniper.net/InfoCenter/index?page=content&id=JSA10734

ADVISORYhttp://lists.apple.com/archives/security-announce/2016/Mar/msg00004.html

ADVISORYhttp://lists.fedoraproject.org/pipermail/package-announce/2016-February/176516.html

ADVISORYhttp://lists.fedoraproject.org/pipermail/package-announce/2016-January/175592.html

ADVISORYhttp://lists.fedoraproject.org/pipermail/package-announce/2016-January/175676.html

ADVISORYhttp://lists.fedoraproject.org/pipermail/package-announce/2016-January/176349.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-01/msg00006.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-01/msg00007.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-01/msg00008.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-01/msg00009.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-01/msg00013.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-01/msg00014.html

ADVISORYhttp://packetstormsecurity.com/files/135273/Qualys-Security-Advisory-OpenSSH-Overflow-Leak.html

ADVISORYhttp://seclists.org/fulldisclosure/2016/Jan/44

ADVISORYhttp://www.debian.org/security/2016/dsa-3446

ADVISORYhttp://www.openssh.com/txt/release-7.1p2

ADVISORYhttp://www.openwall.com/lists/oss-security/2016/01/14/7

ADVISORYhttp://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html

ADVISORYhttp://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html

ADVISORYhttp://www.securityfocus.com/archive/1/537295/100/0/threaded

ADVISORYhttp://www.securityfocus.com/bid/80695

ADVISORYhttp://www.securitytracker.com/id/1034671

ADVISORYhttp://www.ubuntu.com/usn/USN-2869-1

ADVISORYhttps://blogs.sophos.com/2016/02/17/utm-up2date-9-354-released/

ADVISORYhttps://blogs.sophos.com/2016/02/29/utm-up2date-9-319-released/

ADVISORYhttps://bto.bluecoat.com/security-advisory/sa109

ADVISORYhttps://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05247375

ADVISORYhttps://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05356388

ADVISORYhttps://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05385680

ADVISORYhttps://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05390722

ADVISORYhttps://security.FreeBSD.org/advisories/FreeBSD-SA-16:07.openssh.asc

ADVISORYhttps://security.gentoo.org/glsa/201601-01

ADVISORYhttps://support.apple.com/HT206167

ADVISORYhttp://kb.juniper.net/InfoCenter/index?page=content&id=JSA10734

ADVISORYhttp://lists.apple.com/archives/security-announce/2016/Mar/msg00004.html

ADVISORYhttp://lists.fedoraproject.org/pipermail/package-announce/2016-February/176516.html

ADVISORYhttp://lists.fedoraproject.org/pipermail/package-announce/2016-January/175592.html

ADVISORYhttp://lists.fedoraproject.org/pipermail/package-announce/2016-January/175676.html

ADVISORYhttp://lists.fedoraproject.org/pipermail/package-announce/2016-January/176349.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-01/msg00006.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-01/msg00007.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-01/msg00008.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-01/msg00009.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-01/msg00013.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-01/msg00014.html

ADVISORYhttp://packetstormsecurity.com/files/135273/Qualys-Security-Advisory-OpenSSH-Overflow-Leak.html

ADVISORYhttp://seclists.org/fulldisclosure/2016/Jan/44

ADVISORYhttp://www.debian.org/security/2016/dsa-3446

ADVISORYhttp://www.openssh.com/txt/release-7.1p2

ADVISORYhttp://www.openwall.com/lists/oss-security/2016/01/14/7

ADVISORYhttp://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html

ADVISORYhttp://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html

ADVISORYhttp://www.securityfocus.com/archive/1/537295/100/0/threaded

ADVISORYhttp://www.securityfocus.com/bid/80695

ADVISORYhttp://www.securitytracker.com/id/1034671

ADVISORYhttp://www.ubuntu.com/usn/USN-2869-1

ADVISORYhttps://blogs.sophos.com/2016/02/17/utm-up2date-9-354-released/

ADVISORYhttps://blogs.sophos.com/2016/02/29/utm-up2date-9-319-released/

ADVISORYhttps://bto.bluecoat.com/security-advisory/sa109

ADVISORYhttps://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05247375

ADVISORYhttps://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05356388

ADVISORYhttps://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05385680

ADVISORYhttps://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05390722

ADVISORYhttps://security.FreeBSD.org/advisories/FreeBSD-SA-16:07.openssh.asc

ADVISORYhttps://security.gentoo.org/glsa/201601-01

ADVISORYhttps://support.apple.com/HT206167

All References (68)

→

http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10734Third Party Advisory

→

http://lists.apple.com/archives/security-announce/2016/Mar/msg00004.htmlMailing List · Third Party Advisory

→

http://lists.fedoraproject.org/pipermail/package-announce/2016-February/176516.htmlMailing List · Third Party Advisory

→

http://lists.fedoraproject.org/pipermail/package-announce/2016-January/175592.htmlMailing List · Third Party Advisory

→

http://lists.fedoraproject.org/pipermail/package-announce/2016-January/175676.htmlMailing List · Third Party Advisory

→

http://lists.fedoraproject.org/pipermail/package-announce/2016-January/176349.htmlMailing List · Third Party Advisory

→

http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00006.htmlMailing List · Third Party Advisory

→

http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00007.htmlMailing List · Third Party Advisory

→

http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00008.htmlMailing List · Third Party Advisory

→

http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00009.htmlMailing List · Third Party Advisory

→

http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00013.htmlMailing List · Third Party Advisory

→

http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00014.htmlMailing List · Third Party Advisory

→

http://packetstormsecurity.com/files/135273/Qualys-Security-Advisory-OpenSSH-Overflow-Leak.htmlThird Party Advisory · VDB Entry

→

http://seclists.org/fulldisclosure/2016/Jan/44Mailing List · Third Party Advisory

→

http://www.debian.org/security/2016/dsa-3446Third Party Advisory

Quick Facts

CVE IDCVE-2016-0777

CVSS Score6.5 / 10

SeverityMEDIUM

WeaknessCWE-200

CISA KEVNo

Affected5 vendor(s)

PublishedJan 14, 2016

Related CVEs (CWE-200)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2016-0777 in threat intel feeds
→Review IDS/IPS signatures for exploitation attempts

Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.

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