HOME VULNERABILITIESCVE-2016-9463

HIGH

CVE-2016-9463

CWE-303Published: March 28, 2017· Updated: Jun 17, 2026

8.1

CVSS v3.1

Official Description

Nextcloud Server before 9.0.54 and 10.0.1 & ownCloud Server before 9.1.2, 9.0.6, and 8.2.9 suffer from SMB User Authentication Bypass. Nextcloud/ownCloud include an optional and not by default enabled SMB authentication component that allows authenticating users against an SMB server. This backend is implemented in a way that tries to connect to a SMB server and if that succeeded consider the user logged-in. The backend did not properly take into account SMB servers that have any kind of anonymous auth configured. This is the default on SMB servers nowadays and allows an unauthenticated attacker to gain access to an account without valid credentials. Note: The SMB backend is disabled by default and requires manual configuration in the Nextcloud/ownCloud config file. If you have not configured the SMB backend then you're not affected by this vulnerability.

Technical Analysis

CVE-2016-9463 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.1.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

nextcloud1 product(s)

nextcloud server

owncloud1 product(s)

owncloud

Source: NVD CPE · 2 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

PATCHhttps://github.com/nextcloud/apps/commit/b85ace6840b8a6704641086bc3b8eb8e81cb2274

PATCHhttps://github.com/nextcloud/apps/commit/decb91fd31f4ffab191cbf09ce4e5c55c67a4087

PATCHhttps://github.com/owncloud/apps/commit/16cbccfc946c8711721fa684d78135ca1fb64791

PATCHhttps://github.com/owncloud/apps/commit/5d47e7b52646cf79edadd78ce10c754290cbb732

PATCHhttps://github.com/owncloud/apps/commit/a0e07b7ddd5a5fd850a6e07f8457d05b76a300b3

PATCHhttps://nextcloud.com/security/advisory/?id=nc-sa-2016-006

PATCHhttps://owncloud.org/security/advisory/?id=oc-sa-2016-017

PATCHhttps://github.com/nextcloud/apps/commit/b85ace6840b8a6704641086bc3b8eb8e81cb2274

PATCHhttps://github.com/nextcloud/apps/commit/decb91fd31f4ffab191cbf09ce4e5c55c67a4087

PATCHhttps://github.com/owncloud/apps/commit/16cbccfc946c8711721fa684d78135ca1fb64791

PATCHhttps://github.com/owncloud/apps/commit/5d47e7b52646cf79edadd78ce10c754290cbb732

PATCHhttps://github.com/owncloud/apps/commit/a0e07b7ddd5a5fd850a6e07f8457d05b76a300b3

PATCHhttps://nextcloud.com/security/advisory/?id=nc-sa-2016-006

PATCHhttps://owncloud.org/security/advisory/?id=oc-sa-2016-017

ADVISORYhttps://hackerone.com/reports/148151

ADVISORYhttps://rhinosecuritylabs.com/2016/10/operation-ownedcloud-exploitation-post-exploitation-persistence/

ADVISORYhttps://hackerone.com/reports/148151

ADVISORYhttps://rhinosecuritylabs.com/2016/10/operation-ownedcloud-exploitation-post-exploitation-persistence/

All References (18)

→

https://github.com/nextcloud/apps/commit/b85ace6840b8a6704641086bc3b8eb8e81cb2274Issue Tracking · Patch · Third Party Advisory

→

https://github.com/nextcloud/apps/commit/decb91fd31f4ffab191cbf09ce4e5c55c67a4087Issue Tracking · Patch · Third Party Advisory

→

https://github.com/owncloud/apps/commit/16cbccfc946c8711721fa684d78135ca1fb64791Issue Tracking · Patch · Third Party Advisory

→

https://github.com/owncloud/apps/commit/5d47e7b52646cf79edadd78ce10c754290cbb732Issue Tracking · Patch · Third Party Advisory

→

https://github.com/owncloud/apps/commit/a0e07b7ddd5a5fd850a6e07f8457d05b76a300b3Issue Tracking · Patch · Third Party Advisory

→

https://hackerone.com/reports/148151Exploit · Third Party Advisory

→

https://nextcloud.com/security/advisory/?id=nc-sa-2016-006Patch · Vendor Advisory

→

https://owncloud.org/security/advisory/?id=oc-sa-2016-017Patch · Vendor Advisory

→

https://rhinosecuritylabs.com/2016/10/operation-ownedcloud-exploitation-post-exploitation-persistence/Exploit · Technical Description · Third Party Advisory

→

https://github.com/nextcloud/apps/commit/b85ace6840b8a6704641086bc3b8eb8e81cb2274Issue Tracking · Patch · Third Party Advisory

→

https://github.com/nextcloud/apps/commit/decb91fd31f4ffab191cbf09ce4e5c55c67a4087Issue Tracking · Patch · Third Party Advisory

→

https://github.com/owncloud/apps/commit/16cbccfc946c8711721fa684d78135ca1fb64791Issue Tracking · Patch · Third Party Advisory

→

https://github.com/owncloud/apps/commit/5d47e7b52646cf79edadd78ce10c754290cbb732Issue Tracking · Patch · Third Party Advisory

→

https://github.com/owncloud/apps/commit/a0e07b7ddd5a5fd850a6e07f8457d05b76a300b3Issue Tracking · Patch · Third Party Advisory

→

https://hackerone.com/reports/148151Exploit · Third Party Advisory

Quick Facts

CVE IDCVE-2016-9463

CVSS Score8.1 / 10

SeverityHIGH

WeaknessCWE-303

CISA KEVNo

Affected2 vendor(s)

PublishedMar 28, 2017

Related CVEs (CWE-303)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2016-9463 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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