HIGH
OpenSSH: Client buffer-overflow when using roaming connections
Published Jan 14, 2016
8.1
HIGHCVSS 3.1
EPSS 20.90%
Description
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.
Affected products
No data.
Configuration 2
OR
- 5.4
- 5.4
- 5.5
- 5.5
- 5.6
- 5.6
- 5.7
- 5.7
- 5.8
- 5.8
- 5.9
- 5.9
- 6.0
- 6.0
- 6.1
- 6.1
- 6.2
- 6.2
- 6.2
- 6.3
- 6.3
- 6.4
- 6.4
- 6.5
- 6.5
- 6.6
- 6.6
- 6.7
- 6.7
- 6.8
- 6.8
- 6.9
- 6.9
- 7.0
- 7.0
- 7.1
- 7.1
Configuration 3
Configuration 4
- ≤ 15.07
Configuration 5
- 9.353
No data.
Red Hat Enterprise Linux 7
openssh-0:6.6.1p1-23.el7_2
Fixed · RHSA-2016:0043
Red Hat Enterprise Linux 4
openssh
Not affected
Red Hat Enterprise Linux 5
openssh
Not affected
Red Hat Enterprise Linux 6
openssh
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 7 | openssh-0:6.6.1p1-23.el7_2 | Fixed | RHSA-2016:0043 |
| Red Hat Enterprise Linux 4 | openssh | Not affected | n/a |
| Red Hat Enterprise Linux 5 | openssh | Not affected | n/a |
| Red Hat Enterprise Linux 6 | openssh | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
8.1 HIGH CISA ADP
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact High
Integrity Impact High
Availability Impact High
8.1 HIGH NVD
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact High
Integrity Impact High
Availability Impact High
4.6 MEDIUM NVD
AV:N/AC:H/Au:S/C:P/I:P/A:P
Access Vector Network
Access Complexity High
Authentication Single
Confidentiality Impact Partial
Integrity Impact Partial
Availability Impact Partial
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
TotalDecision
n/aAssessed May 29, 2026 · SSVC 2.0.3
20.90% 0.20898
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.20898
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (32 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 20.90% (0.20898) | 97.49th | v5 (v2026.06.15) |
| Sep 22, 2026 | 20.90% (0.20898) | 97.45th | v5 (v2026.06.15) |
| Sep 21, 2026 | 21.95% (0.21953) | 97.60th | v5 (v2026.06.15) |
| Sep 6, 2026 | 20.90% (0.20898) | 97.39th | v5 (v2026.06.15) |
| Sep 5, 2026 | 21.95% (0.21953) | 97.55th | v5 (v2026.06.15) |
| Aug 30, 2026 | 20.90% (0.20898) | 97.38th | v5 (v2026.06.15) |
| Aug 28, 2026 | 21.95% (0.21953) | 97.54th | v5 (v2026.06.15) |
| Aug 24, 2026 | 20.90% (0.20898) | 97.37th | v5 (v2026.06.15) |
| Aug 23, 2026 | 21.95% (0.21953) | 97.53th | v5 (v2026.06.15) |
| Jun 15, 2026 | 20.37% (0.20370) | 97.15th | v5 (v2026.06.15) |
| Mar 4, 2026 | 1.59% (0.01594) | 81.38th | v4 (v2025.03.14) |
| Mar 1, 2026 | 3.36% (0.03357) | 87.16th | v4 (v2025.03.14) |
| Feb 4, 2026 | 1.59% (0.01594) | 81.30th | v4 (v2025.03.14) |
| Feb 1, 2026 | 3.11% (0.03107) | 86.52th | v4 (v2025.03.14) |
| Jan 4, 2026 | 1.59% (0.01594) | 81.22th | v4 (v2025.03.14) |
| Jan 1, 2026 | 3.11% (0.03107) | 86.47th | v4 (v2025.03.14) |
| Dec 4, 2025 | 1.44% (0.01443) | 80.15th | v4 (v2025.03.14) |
| Dec 1, 2025 | 2.82% (0.02817) | 85.72th | v4 (v2025.03.14) |
| Nov 30, 2025 | 1.44% (0.01443) | 80.14th | v4 (v2025.03.14) |
| Jul 23, 2025 | 2.88% (0.02881) | 85.72th | v4 (v2025.03.14) |
| Apr 15, 2025 | 1.31% (0.01314) | 78.67th | v4 (v2025.03.14) |
| Apr 6, 2025 | 2.43% (0.02434) | 83.79th | v4 (v2025.03.14) |
| Mar 30, 2025 | 1.27% (0.01270) | 77.64th | v4 (v2025.03.14) |
| Mar 29, 2025 | 3.84% (0.03835) | 80.01th | v4 (v2025.03.14) |
| Mar 17, 2025 | 1.27% (0.01270) | 78.11th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.26% (0.00263) | 66.51th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.27% (0.00266) | 66.71th | v3 (v2023.03.01) |
| Nov 6, 2023 | 0.27% (0.00266) | 64.07th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.33% (0.00332) | 66.47th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.69% (0.02686) | 82.85th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.69% (0.02686) | 81.17th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.69% (0.02686) | 62.66th | v2 (v2022.01.01) |
Weaknesses (2)
References (36)
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10734 Third Party Advisory
- http://lists.apple.com/archives/security-announce/2016/Mar/msg00004.html vendor-advisoryMailing ListRelease NotesThird Party Advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2016-February/176516.html vendor-advisoryMailing ListThird Party Advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2016-January/176349.html vendor-advisoryMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00006.html vendor-advisoryMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00007.html vendor-advisoryMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00008.html vendor-advisoryMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00009.html vendor-advisoryMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00013.html vendor-advisoryMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00014.html vendor-advisoryMailing ListThird Party Advisory
- http://packetstormsecurity.com/files/135273/Qualys-Security-Advisory-OpenSSH-Overflow-Leak.html Third Party AdvisoryVDB Entry
- http://seclists.org/fulldisclosure/2016/Jan/44 mailing-listMailing ListThird Party Advisory
- http://www.debian.org/security/2016/dsa-3446 vendor-advisoryThird Party Advisory
- http://www.openssh.com/txt/release-7.1p2 PatchRelease NotesVendor Advisory
- http://www.openwall.com/lists/oss-security/2016/01/14/7 mailing-listExploitMailing ListTechnical DescriptionThird 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 mailing-listThird Party AdvisoryVDB Entry
- http://www.securityfocus.com/bid/80698 vdb-entryThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1034671 vdb-entryThird Party AdvisoryVDB Entry
- http://www.ubuntu.com/usn/USN-2869-1 vendor-advisoryThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2016-0778 Vendor Advisory
- https://blogs.sophos.com/2016/02/17/utm-up2date-9-354-released/ Release NotesVendor Advisory
- https://blogs.sophos.com/2016/02/29/utm-up2date-9-319-released/ Release NotesVendor Advisory
- https://bto.bluecoat.com/security-advisory/sa109 Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1298033 Issue Tracking
- 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://nvd.nist.gov/vuln/detail/CVE-2016-0778
- https://security.gentoo.org/glsa/201601-01 vendor-advisoryThird Party Advisory
- https://support.apple.com/HT206167 Vendor Advisory
- https://www.cve.org/CVERecord?id=CVE-2016-0778
- https://www.qualys.com/2016/01/14/cve-2016-0777-cve-2016-0778/openssh-cve-2016-0777-cve-2016-0778.txt
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner redhat
Published Jan 14, 2016
Updated May 29, 2026
Reserved Dec 16, 2015
Link CVE-2016-0778
CISA Vulnrichment
Updated May 29, 2026