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Vulnerability record · CVE-2016-10027 · published 12 January 2017

CVE-2016-10027: Igniterealtime smack race condition vulnerability

Igniterealtime · Smack

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.

5.9 CVSS 3.1 Medium EPSS 1.5% · top 26.5% CWE-362 · Race condition
5.9CVSS 3.1 base score, v2 4.3
1.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
14References
17 Jun 2026Last modified by NVD

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.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.openwall.com/lists/oss-security/2016/12/22/12 Mailing ListPatchThird Party Advisory
http://www.securityfocus.com/bid/95129 Third Party AdvisoryVDB Entry
https://community.igniterealtime.org/blogs/ignite/2016/11/22/smack-security-advisory-2016-11-22 Vendor Advisory
https://github.com/igniterealtime/Smack/commit/059ee99ba0d5ff7758829acf5a9aeede09ec820b PatchThird Party Advisory
https://github.com/igniterealtime/Smack/commit/a9d5cd4a611f47123f9561bc5a81a4555fe7cb04 PatchThird Party Advisory
https://issues.igniterealtime.org/projects/SMACK/issues/SMACK-739 Issue TrackingVendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J4WXAZ4JVJXHMEDDXJVWJHP
http://www.openwall.com/lists/oss-security/2016/12/22/12 Mailing ListPatchThird Party Advisory
http://www.securityfocus.com/bid/95129 Third Party AdvisoryVDB Entry
https://community.igniterealtime.org/blogs/ignite/2016/11/22/smack-security-advisory-2016-11-22 Vendor Advisory
https://github.com/igniterealtime/Smack/commit/059ee99ba0d5ff7758829acf5a9aeede09ec820b PatchThird Party Advisory
https://github.com/igniterealtime/Smack/commit/a9d5cd4a611f47123f9561bc5a81a4555fe7cb04 PatchThird Party Advisory
https://issues.igniterealtime.org/projects/SMACK/issues/SMACK-739 Issue TrackingVendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J4WXAZ4JVJXHMEDDXJVWJHP

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Source: NIST National Vulnerability Database (record CVE-2016-10027), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.