High
Security advisory
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2016-0778
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 07:25 UTC · Revision 1
Source evidence
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.
osv:CVE-2016-0778
Complete source record
{
"id": "f68d60b4c3f7f185be14ab569bd438106e075cb69787ce41d59a9368bee7278a",
"url": "https://osv.dev/vulnerability/CVE-2016-0778",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2016-0778",
"summary": "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.",
"evidence": "osv:CVE-2016-0778",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2016-0778",
"aliases": [
"CVE-2016-0778"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/openssh/openssh-portable",
"type": "GIT",
"events": [
{
"introduced": "d13d995a202c562c80d7e7a11c43504c505481d1"
},
{
"last_affected": "e91346dc2bbf460246df2ab591b7613908c1b0ad"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:openbsd:openssh:5.4:*:*:*:*:*:*:*",
"range": [
{
"introduced": "5.4"
},
{
"last_affected": "5.4"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:openbsd:openssh:5.4:p1:*:*:*:*:*:*",
"range": [
{
"introduced": "5.4-p1"
},
{
"last_affected": "5.4-p1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:openbsd:openssh:5.5:*:*:*:*:*:*:*",
"range": [
{
"introduced": "5.5"
},
{
"last_affected": "5.5"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:openbsd:openssh:5.5:p1:*:*:*:*:*:*",
"range": [
{
"introduced": "5.5-p1"
},
{
"last_affected": "5.5-p1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:openbsd:openssh:5.6:*:*:*:*:*:*:*",
"range": [
{
"introduced": "5.6"
},
{
"last_affected": "5.6"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:openbsd:openssh:5.6:p1:*:*:*:*:*:*",
"range": [
{
"introduced": "5.6-p1"
},
{
"last_affected": "5.6-p1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:openbsd:openssh:5.7:*:*:*:*:*:*:*",
"range": [
{
"introduced": "5.7"
},
{
"last_affected": "5.7"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:openbsd:openssh:5.7:p1:*:*:*:*:*:*",
"range": [
{
"introduced": "5.7-p1"
},
{
"last_affected": "5.7-p1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:openbsd:openssh:5.8:p1:*:*:*:*:*:*",
"range": [
{
"introduced": "5.8-p1"
},
{
"last_affected": "5.8-p1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:openbsd:openssh:5.9:*:*:*:*:*:*:*",
"range": [
{
"introduced": "5.9"
},
{
"last_affected": "5.9"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:openbsd:openssh:5.9:p1:*:*:*:*:*:*",
"range": [
{
"introduced": "5.9-p1"
},
{
"last_affected": "5.9-p1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:openbsd:openssh:6.0:*:*:*:*:*:*:*",
"range": [
{
"introduced": "6.0"
},
{
"last_affected": "6.0"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:openbsd:openssh:6.0:p1:*:*:*:*:*:*",
"range": [
{
"introduced": "6.0-p1"
},
{
"last_affected": "6.0-p1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:openbsd:openssh:6.1:*:*:*:*:*:*:*",
"range": [
{
"introduced": "6.1"
},
{
"last_affected": "6.1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:openbsd:openssh:6.1:p1:*:*:*:*:*:*",
"range": [
{
"introduced": "6.1-p1"
},
{
"last_affected": "6.1-p1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:openbsd:openssh:6.2:p1:*:*:*:*:*:*",
"range": [
{
"introduced": "6.2-p1"
},
{
"last_affected": "6.2-p1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:openbsd:openssh:6.2:p2:*:*:*:*:*:*",
"range": [
{
"introduced": "6.2-p2"
},
{
"last_affected": "6.2-p2"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:openbsd:openssh:6.3:*:*:*:*:*:*:*",
"range": [
{
"introduced": "6.3"
},
{
"last_affected": "6.3"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:openbsd:openssh:6.3:p1:*:*:*:*:*:*",
"range": [
{
"introduced": "6.3-p1"
},
{
"last_affected": "6.3-p1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:openbsd:openssh:6.4:*:*:*:*:*:*:*",
"range": [
{
"introduced": "6.4"
},
{
"last_affected": "6.4"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:openbsd:openssh:6.4:p1:*:*:*:*:*:*",
"range": [
{
"introduced": "6.4-p1"
},
{
"last_affected": "6.4-p1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:openbsd:openssh:6.5:*:*:*:*:*:*:*",
"range": [
{
"introduced": "6.5"
},
{
"last_affected": "6.5"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:openbsd:openssh:6.5:p1:*:*:*:*:*:*",
"range": [
{
"introduced": "6.5-p1"
},
{
"last_affected": "6.5-p1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:openbsd:openssh:6.6:*:*:*:*:*:*:*",
"range": [
{
"introduced": "6.6"
},
{
"last_affected": "6.6"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:openbsd:openssh:6.6:p1:*:*:*:*:*:*",
"range": [
{
"introduced": "6.6-p1"
},
{
"last_affected": "6.6-p1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:openbsd:openssh:6.7:*:*:*:*:*:*:*",
"range": [
{
"introduced": "6.7"
},
{
"last_affected": "6.7"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:openbsd:openssh:6.7:p1:*:*:*:*:*:*",
"range": [
{
"introduced": "6.7-p1"
},
{
"last_affected": "6.7-p1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:openbsd:openssh:6.8:*:*:*:*:*:*:*",
"range": [
{
"introduced": "6.8"
},
{
"last_affected": "6.8"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:openbsd:openssh:6.8:p1:*:*:*:*:*:*",
"range": [
{
"introduced": "6.8-p1"
},
{
"last_affected": "6.8-p1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:openbsd:openssh:6.9:*:*:*:*:*:*:*",
"range": [
{
"introduced": "6.9"
},
{
"last_affected": "6.9"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:openbsd:openssh:6.9:p1:*:*:*:*:*:*",
"range": [
{
"introduced": "6.9-p1"
},
{
"last_affected": "6.9-p1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:openbsd:openssh:7.0:*:*:*:*:*:*:*",
"range": [
{
"introduced": "7.0"
},
{
"last_affected": "7.0"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:openbsd:openssh:7.0:p1:*:*:*:*:*:*",
"range": [
{
"introduced": "7.0-p1"
},
{
"last_affected": "7.0-p1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:openbsd:openssh:7.1:p1:*:*:*:*:*:*",
"range": [
{
"introduced": "7.1-p1"
},
{
"last_affected": "7.1-p1"
}
],
"source": "CPE_STRING"
}
]
}
}
],
"versions": [
"5.4",
"5.5",
"5.6",
"5.7",
"5.8-p1",
"5.9",
"6.0",
"6.1",
"6.2-p1",
"6.2-p2",
"6.3",
"6.4",
"6.5",
"6.6",
"6.7",
"6.8",
"6.9",
"7.0",
"7.1-p1"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2016-0778.json"
}
}
],
"modified": "2026-10-24T10:30:53.100313350Z",
"provider": "osv",
"references": [
"https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf",
"https://blogs.sophos.com/2016/02/17/utm-up2date-9-354-released/",
"https://blogs.sophos.com/2016/02/29/utm-up2date-9-319-released/",
"https://bto.bluecoat.com/security-advisory/sa109",
"https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05247375",
"https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05356388",
"https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05385680",
"https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05390722",
"https://security.gentoo.org/glsa/201601-01",
"https://support.apple.com/HT206167"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:*"
],
"vendor_product": "apple:mac_os_x",
"extracted_events": [
{
"range": [
{
"introduced": "10.9.0"
},
{
"last_affected": "10.9.5"
},
{
"introduced": "10.10.0"
},
{
"last_affected": "10.10.5"
},
{
"introduced": "10.11.0"
},
{
"last_affected": "10.11.3"
}
],
"source": "CPE_RANGE"
}
]
},
{
"cpes": [
"cpe:2.3:o:hp:virtual_customer_access_system:*:*:*:*:*:*:*:*"
],
"vendor_product": "hp:virtual_customer_access_system",
"extracted_events": [
{
"range": [
{
"last_affected": "15.07"
}
],
"source": "CPE_RANGE"
}
]
},
{
"cpes": [
"cpe:2.3:a:openbsd:openssh:5.8:*:*:*:*:*:*:*",
"cpe:2.3:a:openbsd:openssh:6.2:*:*:*:*:*:*:*",
"cpe:2.3:a:openbsd:openssh:7.1:*:*:*:*:*:*:*"
],
"vendor_product": "openbsd:openssh",
"extracted_events": [
{
"range": [
{
"introduced": "5.8"
},
{
"last_affected": "5.8"
},
{
"introduced": "6.2"
},
{
"last_affected": "6.2"
},
{
"introduced": "7.1"
},
{
"last_affected": "7.1"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:oracle:linux:7:*:*:*:*:*:*:*"
],
"vendor_product": "oracle:linux",
"extracted_events": [
{
"range": [
{
"introduced": "7"
},
{
"last_affected": "7"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:oracle:solaris:11.3:*:*:*:*:*:*:*"
],
"vendor_product": "oracle:solaris",
"extracted_events": [
{
"range": [
{
"introduced": "11.3"
},
{
"last_affected": "11.3"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:sophos:unified_threat_management_software:9.353:*:*:*:*:*:*:*"
],
"vendor_product": "sophos:unified_threat_management_software",
"extracted_events": [
{
"range": [
{
"introduced": "9.353"
},
{
"last_affected": "9.353"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2016-0778",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 437844,
"published_at": "2016-01-14T22:59:02.28+00:00"
}