CVE-2016-10027

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Summary

CVECVE-2016-10027
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2017-01-12 23:59:00 UTC
Updated2026-05-06 22:30:45 UTC
DescriptionRace 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.

Risk And Classification

Primary CVSS: v3.1 5.9 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS: 0.003880000 probability, percentile 0.599250000 (date 2026-05-11)

Problem Types: CWE-362 | n/a

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
2.0[email protected]Primary4.3AV:N/AC:M/Au:N/C:P/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Medium
Authentication
None
Confidentiality
Partial
Integrity
None
Availability
None

AV:N/AC:M/Au:N/C:P/I:N/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Fedoraproject Fedora 25 All All All
Application Igniterealtime Smack All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
Ignite Realtime Blog: Smack Security Advisory 2... | Ignite Realtime af854a3a-2127-422b-91ae-364da2661108 community.igniterealtime.org Vendor Advisory
oss-security - Re: CVE Request: Smack: TLS SecurityMode.required not always enforced, leading to striptls attack af854a3a-2127-422b-91ae-364da2661108 www.openwall.com Mailing List, Patch, Third Party Advisory
Ignite Realtime Smack CVE-2016-10027 Man in the Middle Security Bypass Vulnerability af854a3a-2127-422b-91ae-364da2661108 www.securityfocus.com Third Party Advisory, VDB Entry
[SECURITY] Fedora 25 Update: smack-4.1.5-3.fc25 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
Smack - IgniteRealtime JIRA af854a3a-2127-422b-91ae-364da2661108 issues.igniterealtime.org Issue Tracking, Vendor Advisory
Move TLS Required check at the end of connect() · igniterealtime/Smack@a9d5cd4 · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Patch, Third Party Advisory
Move TLS Required check at the end of connect() · igniterealtime/Smack@059ee99 · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Patch, Third Party Advisory
[SECURITY] Fedora 25 Update: smack-4.1.5-3.fc25 - package-announce - Fedora Mailing-Lists MITRE lists.fedoraproject.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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