CVE-2016-0778

Exp

The (1) roaming_read and (2) roaming_write functions in roaming_common.c in the client in OpenSSH 5.x, 6.x, and 7.x before 7.1p2, when certain proxy and forward options are enabled, do not properly maintain connection file descriptors, which allows remote servers to cause a denial of service (heap-based buffer overflow) or possibly have unspecified other impact by requesting many forwardings.

Published: 2016-01-14 Last update: 2026-05-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2016-0778 is rated High Exploit Risk (86.4/100): CVSS High severity, with high exploitation likelihood (EPSS 20.37%, 97th percentile). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +19.58% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2016-0778

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2016-0778

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.79% 20.37% +19.58%
2 2026-05-30 0.91% 0.79% -0.13%
3 2026-05-13 — 0.91% —

Full EPSS history (50 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2016-0778

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.1 3.1 HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.2 5.9 134c704f-9b21-4f2e-91b3-4a467353bcc0
8.1 3.0 HIGH
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.2 5.9 [email protected]
4.6 2.0 MEDIUM
AV:N/AC:H/Au:S/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:H)
Exploitation requires uncommon or highly specific conditions.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 3.9 6.4 [email protected]

Weakness enumeration for CVE-2016-0778

OS Trackers for CVE-2016-0778

vendor priority summary link
debian not yet assigned CVE-2016-0778 not yet assigned priority: Debian including 1 source packages (openssh), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2016-0778
gentoo normal CVE-2016-0778: 1 GLSA(s) (201601-01), 1 atom(s) (net-misc/openssh); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2016-0778
redhat low — https://access.redhat.com/security/cve/CVE-2016-0778
suse high CVE-2016-0778 severity important: SUSE including 117 source package names (openssh-10.0p2-160000.2.2, openssh-6.2p2-0.24.1, …), 184 product×package rows across 51 product lines (SUSE Liberty Linux 7, SUSE Linux Enterprise Desktop 11 SP3, … (51 product lines)): Fixed 184. https://www.suse.com/security/cve/CVE-2016-0778/
ubuntu medium CVE-2016-0778 medium priority: Ubuntu including 1 source packages (openssh), 5 status rows across 5 suites (precise, trusty, upstream, vivid, wily): released 5. https://ubuntu.com/security/CVE-2016-0778

Affected software / configurations for CVE-2016-0778

Vendor Product Version Raw CPE
oracle linux 7 cpe:2.3:o:oracle:linux:7:*:*:*:*:*:*:*
oracle solaris 11.3 cpe:2.3:o:oracle:solaris:11.3:*:*:*:*:*:*:*
openbsd openssh 5.4 cpe:2.3:a:openbsd:openssh:5.4:*:*:*:*:*:*:*
openbsd openssh 5.4 cpe:2.3:a:openbsd:openssh:5.4:p1:*:*:*:*:*:*
openbsd openssh 5.5 cpe:2.3:a:openbsd:openssh:5.5:*:*:*:*:*:*:*
openbsd openssh 5.5 cpe:2.3:a:openbsd:openssh:5.5:p1:*:*:*:*:*:*
openbsd openssh 5.6 cpe:2.3:a:openbsd:openssh:5.6:*:*:*:*:*:*:*
openbsd openssh 5.6 cpe:2.3:a:openbsd:openssh:5.6:p1:*:*:*:*:*:*
openbsd openssh 5.7 cpe:2.3:a:openbsd:openssh:5.7:*:*:*:*:*:*:*
openbsd openssh 5.7 cpe:2.3:a:openbsd:openssh:5.7:p1:*:*:*:*:*:*
openbsd openssh 5.8 cpe:2.3:a:openbsd:openssh:5.8:*:*:*:*:*:*:*
openbsd openssh 5.8 cpe:2.3:a:openbsd:openssh:5.8:p1:*:*:*:*:*:*
openbsd openssh 5.9 cpe:2.3:a:openbsd:openssh:5.9:*:*:*:*:*:*:*
openbsd openssh 5.9 cpe:2.3:a:openbsd:openssh:5.9:p1:*:*:*:*:*:*
openbsd openssh 6.0 cpe:2.3:a:openbsd:openssh:6.0:*:*:*:*:*:*:*
openbsd openssh 6.0 cpe:2.3:a:openbsd:openssh:6.0:p1:*:*:*:*:*:*
openbsd openssh 6.1 cpe:2.3:a:openbsd:openssh:6.1:*:*:*:*:*:*:*
openbsd openssh 6.1 cpe:2.3:a:openbsd:openssh:6.1:p1:*:*:*:*:*:*
openbsd openssh 6.2 cpe:2.3:a:openbsd:openssh:6.2:*:*:*:*:*:*:*
openbsd openssh 6.2 cpe:2.3:a:openbsd:openssh:6.2:p1:*:*:*:*:*:*
openbsd openssh 6.2 cpe:2.3:a:openbsd:openssh:6.2:p2:*:*:*:*:*:*
openbsd openssh 6.3 cpe:2.3:a:openbsd:openssh:6.3:*:*:*:*:*:*:*
openbsd openssh 6.3 cpe:2.3:a:openbsd:openssh:6.3:p1:*:*:*:*:*:*
openbsd openssh 6.4 cpe:2.3:a:openbsd:openssh:6.4:*:*:*:*:*:*:*
openbsd openssh 6.4 cpe:2.3:a:openbsd:openssh:6.4:p1:*:*:*:*:*:*
openbsd openssh 6.5 cpe:2.3:a:openbsd:openssh:6.5:*:*:*:*:*:*:*
openbsd openssh 6.5 cpe:2.3:a:openbsd:openssh:6.5:p1:*:*:*:*:*:*
openbsd openssh 6.6 cpe:2.3:a:openbsd:openssh:6.6:*:*:*:*:*:*:*
openbsd openssh 6.6 cpe:2.3:a:openbsd:openssh:6.6:p1:*:*:*:*:*:*
openbsd openssh 6.7 cpe:2.3:a:openbsd:openssh:6.7:*:*:*:*:*:*:*
openbsd openssh 6.7 cpe:2.3:a:openbsd:openssh:6.7:p1:*:*:*:*:*:*
openbsd openssh 6.8 cpe:2.3:a:openbsd:openssh:6.8:*:*:*:*:*:*:*
openbsd openssh 6.8 cpe:2.3:a:openbsd:openssh:6.8:p1:*:*:*:*:*:*
openbsd openssh 6.9 cpe:2.3:a:openbsd:openssh:6.9:*:*:*:*:*:*:*
openbsd openssh 6.9 cpe:2.3:a:openbsd:openssh:6.9:p1:*:*:*:*:*:*
openbsd openssh 7.0 cpe:2.3:a:openbsd:openssh:7.0:*:*:*:*:*:*:*
openbsd openssh 7.0 cpe:2.3:a:openbsd:openssh:7.0:p1:*:*:*:*:*:*
openbsd openssh 7.1 cpe:2.3:a:openbsd:openssh:7.1:*:*:*:*:*:*:*
openbsd openssh 7.1 cpe:2.3:a:openbsd:openssh:7.1:p1:*:*:*:*:*:*
apple mac_os_x >= 10.9.0, <= 10.9.5 cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:*
apple mac_os_x >= 10.10.0, <= 10.10.5 cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:*
apple mac_os_x >= 10.11.0, <= 10.11.3 cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:*
hp virtual_customer_access_system <= 15.07 cpe:2.3:o:hp:virtual_customer_access_system:*:*:*:*:*:*:*:*
sophos unified_threat_management_software 9.353 cpe:2.3:a:sophos:unified_threat_management_software:9.353:*:*:*:*:*:*:*

References for CVE-2016-0778

URL Tags
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10734 Third Party Advisory
http://lists.apple.com/archives/security-announce/2016/Mar/msg00004.html Mailing List Release Notes Third Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2016-February/176516.html Mailing List Third Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2016-January/176349.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00006.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00007.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00008.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00009.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00013.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00014.html Mailing List Third Party Advisory
http://packetstormsecurity.com/files/135273/Qualys-Security-Advisory-OpenSSH-Overflow-Leak.html Third Party Advisory VDB Entry
http://seclists.org/fulldisclosure/2016/Jan/44 Mailing List Third Party Advisory
http://www.debian.org/security/2016/dsa-3446 Third Party Advisory
http://www.openssh.com/txt/release-7.1p2 Patch Release Notes Vendor Advisory
http://www.openwall.com/lists/oss-security/2016/01/14/7 Exploit Mailing List Technical Description Third Party Advisory
http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html Third Party Advisory
http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html Third Party Advisory
http://www.securityfocus.com/archive/1/537295/100/0/threaded Third Party Advisory VDB Entry
http://www.securityfocus.com/bid/80698 Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1034671 Third Party Advisory VDB Entry
http://www.ubuntu.com/usn/USN-2869-1 Third Party Advisory
https://blogs.sophos.com/2016/02/17/utm-up2date-9-354-released/ Release Notes Vendor Advisory
https://blogs.sophos.com/2016/02/29/utm-up2date-9-319-released/ Release Notes Vendor Advisory
https://bto.bluecoat.com/security-advisory/sa109 Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05247375 Third Party Advisory
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05356388 Third Party Advisory
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05385680 Third Party Advisory
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05390722 Third Party Advisory
https://security.gentoo.org/glsa/201601-01 Third Party Advisory
https://support.apple.com/HT206167 Vendor Advisory
cvelogic Threat Intelligence