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Vulnerability record · CVE-2016-6302 · published 16 September 2016

CVE-2016-6302: Openssl improper input validation vulnerability

OOpenssl · Openssl

The tls_decrypt_ticket function in ssl/t1_lib.c in OpenSSL before 1.1.0 does not consider the HMAC size during validation of the ticket length, which allows remote attackers to cause a denial of service via a ticket that is too short.

7.5 CVSS 3.0 High EPSS 28% · top 2.0% CWE-20 · Improper input validation
7.5CVSS 3.0 base score, v2 5.0
28%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
52References
17 Jun 2026Last modified by NVD

Description

The tls_decrypt_ticket function in ssl/t1_lib.c in OpenSSL before 1.1.0 does not consider the HMAC size during validation of the ticket length, which allows remote attackers to cause a denial of service via a ticket that is too short.

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

Affected products

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

References

LinkTags
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10759 Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-1940.html
http://www-01.ibm.com/support/docview.wss?uid=swg21995039 Third Party Advisory
http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html
http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.html
http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html PatchThird Party Advisory
http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
http://www.oracle.com/technetwork/topics/security/bulletinoct2016-3090566.html PatchThird Party Advisory
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2016-3090545.html PatchThird Party Advisory
http://www.oracle.com/technetwork/topics/security/ovmbulletinoct2016-3090547.html PatchThird Party Advisory
http://www.securityfocus.com/bid/92628 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1036885
http://www.splunk.com/view/SP-CAAAPSV Third Party Advisory
http://www.splunk.com/view/SP-CAAAPUE Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2185
https://access.redhat.com/errata/RHSA-2018:2186
https://access.redhat.com/errata/RHSA-2018:2187
https://bto.bluecoat.com/security-advisory/sa132 Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
https://git.openssl.org/?p=openssl.git%3Ba=commit%3Bh=e97763c92c655dcf4af2860b3abd2bc4c8a267f9
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA40312 Third Party Advisory
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:26.openssl.asc
https://www.tenable.com/security/tns-2016-16 Third Party Advisory
https://www.tenable.com/security/tns-2016-20
https://www.tenable.com/security/tns-2016-21
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10759 Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-1940.html
http://www-01.ibm.com/support/docview.wss?uid=swg21995039 Third Party Advisory
http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html
http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.html
http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html PatchThird Party Advisory
http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
http://www.oracle.com/technetwork/topics/security/bulletinoct2016-3090566.html PatchThird Party Advisory
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2016-3090545.html PatchThird Party Advisory
http://www.oracle.com/technetwork/topics/security/ovmbulletinoct2016-3090547.html PatchThird Party Advisory
http://www.securityfocus.com/bid/92628 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1036885
http://www.splunk.com/view/SP-CAAAPSV Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2016-6302), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.