HOMEVULNERABILITIESCVE-2016-10027
MEDIUM

CVE-2016-10027

CWE-362Published: January 12, 2017· Updated: Jun 17, 2026

5.9
CVSS v3.1

Official Description

Race condition in the XMPP library in Smack before 4.1.9, when the SecurityMode.required TLS setting has been set, allows man-in-the-middle attackers to bypass TLS protections and trigger use of cleartext for client authentication by stripping the "starttls" feature from a server response.

NVD Source

Technical Analysis

CVE-2016-10027 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), with a CVSS base score of 5.9.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityHigh
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected Vendors & Products

Fedora1 product(s)
fedora
igniterealtime1 product(s)
smack
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttp://www.openwall.com/lists/oss-security/2016/12/22/12
PATCHhttps://github.com/igniterealtime/Smack/commit/059ee99ba0d5ff7758829acf5a9aeede09ec820b
PATCHhttps://github.com/igniterealtime/Smack/commit/a9d5cd4a611f47123f9561bc5a81a4555fe7cb04
PATCHhttp://www.openwall.com/lists/oss-security/2016/12/22/12
PATCHhttps://github.com/igniterealtime/Smack/commit/059ee99ba0d5ff7758829acf5a9aeede09ec820b
PATCHhttps://github.com/igniterealtime/Smack/commit/a9d5cd4a611f47123f9561bc5a81a4555fe7cb04
ADVISORYhttp://www.securityfocus.com/bid/95129
ADVISORYhttps://community.igniterealtime.org/blogs/ignite/2016/11/22/smack-security-advisory-2016-11-22
ADVISORYhttps://issues.igniterealtime.org/projects/SMACK/issues/SMACK-739
ADVISORYhttp://www.securityfocus.com/bid/95129
ADVISORYhttps://community.igniterealtime.org/blogs/ignite/2016/11/22/smack-security-advisory-2016-11-22
ADVISORYhttps://issues.igniterealtime.org/projects/SMACK/issues/SMACK-739

All References (14)

→
http://www.openwall.com/lists/oss-security/2016/12/22/12Mailing List · Patch · Third Party Advisory
→
http://www.securityfocus.com/bid/95129Third Party Advisory · VDB Entry
→
https://community.igniterealtime.org/blogs/ignite/2016/11/22/smack-security-advisory-2016-11-22Vendor Advisory
→
https://github.com/igniterealtime/Smack/commit/059ee99ba0d5ff7758829acf5a9aeede09ec820bPatch · Third Party Advisory
→
https://github.com/igniterealtime/Smack/commit/a9d5cd4a611f47123f9561bc5a81a4555fe7cb04Patch · Third Party Advisory
→
https://issues.igniterealtime.org/projects/SMACK/issues/SMACK-739Issue Tracking · Vendor Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J4WXAZ4JVJXHMEDDXJVWJHPVBF5QCTZF/
→
http://www.openwall.com/lists/oss-security/2016/12/22/12Mailing List · Patch · Third Party Advisory
→
http://www.securityfocus.com/bid/95129Third Party Advisory · VDB Entry
→
https://community.igniterealtime.org/blogs/ignite/2016/11/22/smack-security-advisory-2016-11-22Vendor Advisory
→
https://github.com/igniterealtime/Smack/commit/059ee99ba0d5ff7758829acf5a9aeede09ec820bPatch · Third Party Advisory
→
https://github.com/igniterealtime/Smack/commit/a9d5cd4a611f47123f9561bc5a81a4555fe7cb04Patch · Third Party Advisory
→
https://issues.igniterealtime.org/projects/SMACK/issues/SMACK-739Issue Tracking · Vendor Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J4WXAZ4JVJXHMEDDXJVWJHPVBF5QCTZF/

Quick Facts

CVE IDCVE-2016-10027
CVSS Score5.9 / 10
SeverityMEDIUM
WeaknessCWE-362
CISA KEVNo
Affected2 vendor(s)
PublishedJan 12, 2017

Related CVEs (CWE-362)

CVE-2014-0703
10.0
CVE-2010-1228
10.0
CVE-2015-8556
10.0
CVE-2025-66419
10.0
CVE-2008-6598
10.0
CVE-2020-1660
9.9

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2016-10027 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. CVE data is provided under the NVD usage policy.
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