CVE-2016-6306

Name: CVE-2016-6306
Creator: NVD / NIST
Published: 2016-09-26T19:59:02.91+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.9/10EPSS 41.68%

Last modified Jun 17, 2026

CVE-2016-6306 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. The certificate parser in OpenSSL before 1.0.1u and 1.0.2 before 1.0.2i might allow remote attackers to cause a denial of service (out-of-bounds read) via crafted certificate operations, related to s3_clnt.c and s3_srvr.c.. EPSS estimates a 41.68% chance of exploitation in the next 30 days.

Description

The certificate parser in OpenSSL before 1.0.1u and 1.0.2 before 1.0.2i might allow remote attackers to cause a denial of service (out-of-bounds read) via crafted certificate operations, related to s3_clnt.c and s3_srvr.c.

Metrics

CVSS 3.1

5.9/10

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

EPSS Probability

41.68%

98.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Openssl	Openssl	1.0.1
Openssl	Openssl	1.0.1a
Openssl	Openssl	1.0.1b
Openssl	Openssl	1.0.1c
Openssl	Openssl	1.0.1d
Openssl	Openssl	1.0.1e
Openssl	Openssl	1.0.1f
Openssl	Openssl	1.0.1g
Openssl	Openssl	1.0.1h
Openssl	Openssl	1.0.1i
Openssl	Openssl	1.0.1j
Openssl	Openssl	1.0.1k
Openssl	Openssl	1.0.1l
Openssl	Openssl	1.0.1m
Openssl	Openssl	1.0.1n
Openssl	Openssl	1.0.1o
Openssl	Openssl	1.0.1p
Openssl	Openssl	1.0.1q
Openssl	Openssl	1.0.1r
Openssl	Openssl	1.0.1s
Openssl	Openssl	1.0.1t
Hp	Icewall Federation Agent	3.0
Hp	Icewall Mcrp	3.0
Hp	Icewall Sso	10.0
Hp	Icewall Sso Agent Option	10.0
Novell	Suse Linux Enterprise Module For Web Scripting	12.0
Openssl	Openssl	1.0.2
Openssl	Openssl	1.0.2a
Openssl	Openssl	1.0.2b
Openssl	Openssl	1.0.2c
Openssl	Openssl	1.0.2d
Openssl	Openssl	1.0.2e
Openssl	Openssl	1.0.2f
Openssl	Openssl	1.0.2h
Nodejs	Node.Js	>= 0.10.0, < 0.10.47
Nodejs	Node.Js	>= 0.12.0, < 0.12.16
Nodejs	Node.Js	>= 4.0.0, <= 4.1.2
Nodejs	Node.Js	>= 4.2.0, < 4.6.0
Nodejs	Node.Js	>= 5.0.0, <= 5.12.0
Nodejs	Node.Js	>= 6.0.0, < 6.7.0
Debian	Debian Linux	8.0
Canonical	Ubuntu Linux	12.04
Canonical	Ubuntu Linux	14.04
Canonical	Ubuntu Linux	16.04

References

http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10759Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-09/msg00022.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-09/msg00023.htmlThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-09/msg00024.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-09/msg00031.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00005.htmlThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00011.htmlThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00012.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00013.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00021.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00029.htmlThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2017-10/msg00010.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2017-10/msg00011.htmlThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2018-02/msg00032.htmlMailing List, Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-1940.htmlThird Party Advisory
http://seclists.org/fulldisclosure/2017/Jul/31Mailing List, Third Party Advisory
http://www-01.ibm.com/support/docview.wss?uid=swg21995039Third Party Advisory
http://www.debian.org/security/2016/dsa-3673Third Party Advisory
http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20170322-01-openssl-enThird Party Advisory
http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.htmlPatch, Third Party Advisory
http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.htmlPatch, Third Party Advisory
http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.htmlPatch, Third Party Advisory
http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.htmlPatch, Third Party Advisory
http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.htmlPatch, Third Party Advisory
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2016-3090545.htmlThird Party Advisory
http://www.oracle.com/technetwork/topics/security/ovmbulletinoct2016-3090547.htmlThird Party Advisory
http://www.securityfocus.com/bid/93153Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1036885Third Party Advisory, VDB Entry
http://www.ubuntu.com/usn/USN-3087-1Third Party Advisory
http://www.ubuntu.com/usn/USN-3087-2Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2185Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2186Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2187Third Party Advisory
https://bto.bluecoat.com/security-advisory/sa132Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
https://git.openssl.org/?p=openssl.git%3Ba=commit%3Bh=52e623c4cb06fffa9d5e75c60b34b4bc130b12e9
https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-c05302448Third Party Advisory
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05302448Third Party Advisory
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA40312Third Party Advisory
https://kc.mcafee.com/corporate/index?page=content&id=SB10215Third Party Advisory
https://nodejs.org/en/blog/vulnerability/september-2016-security-releases/Vendor Advisory
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:26.openssl.ascThird Party Advisory
https://security.gentoo.org/glsa/201612-16Third Party Advisory
https://support.f5.com/csp/article/K90492697Third Party Advisory
https://support.hpe.com/hpsc/doc/public/display?docLocale=en&docId=emr_na-hpesbhf03856en_usThird Party Advisory
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03856en_usThird Party Advisory
https://www.arista.com/en/support/advisories-notices/security-advisories/1749-security-advisory-24Third Party Advisory
https://www.openssl.org/news/secadv/20160922.txtVendor Advisory
https://www.oracle.com/security-alerts/cpuapr2020.htmlThird Party Advisory
https://www.oracle.com/security-alerts/cpujan2020.htmlThird Party Advisory
https://www.oracle.com/security-alerts/cpujul2020.htmlThird Party Advisory
https://www.oracle.com/security-alerts/cpuoct2020.htmlThird Party Advisory
https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.htmlPatch, Third Party Advisory
https://www.tenable.com/security/tns-2016-16Third Party Advisory
https://www.tenable.com/security/tns-2016-20Third Party Advisory
https://www.tenable.com/security/tns-2016-21Third Party Advisory
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10759Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-09/msg00022.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-09/msg00023.htmlThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-09/msg00024.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-09/msg00031.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00005.htmlThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00011.htmlThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00012.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00013.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00021.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00029.htmlThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2017-10/msg00010.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2017-10/msg00011.htmlThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2018-02/msg00032.htmlMailing List, Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-1940.htmlThird Party Advisory
http://seclists.org/fulldisclosure/2017/Jul/31Mailing List, Third Party Advisory
http://www-01.ibm.com/support/docview.wss?uid=swg21995039Third Party Advisory
http://www.debian.org/security/2016/dsa-3673Third Party Advisory
http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20170322-01-openssl-enThird Party Advisory
http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.htmlPatch, Third Party Advisory
http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.htmlPatch, Third Party Advisory
http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.htmlPatch, Third Party Advisory
http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.htmlPatch, Third Party Advisory
http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.htmlPatch, Third Party Advisory
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2016-3090545.htmlThird Party Advisory
http://www.oracle.com/technetwork/topics/security/ovmbulletinoct2016-3090547.htmlThird Party Advisory
http://www.securityfocus.com/bid/93153Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1036885Third Party Advisory, VDB Entry
http://www.ubuntu.com/usn/USN-3087-1Third Party Advisory
http://www.ubuntu.com/usn/USN-3087-2Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2185Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2186Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2187Third Party Advisory
https://bto.bluecoat.com/security-advisory/sa132Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
https://git.openssl.org/?p=openssl.git%3Ba=commit%3Bh=52e623c4cb06fffa9d5e75c60b34b4bc130b12e9
https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-c05302448Third Party Advisory
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05302448Third Party Advisory
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA40312Third Party Advisory
https://kc.mcafee.com/corporate/index?page=content&id=SB10215Third Party Advisory
https://nodejs.org/en/blog/vulnerability/september-2016-security-releases/Vendor Advisory
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:26.openssl.ascThird Party Advisory
https://security.gentoo.org/glsa/201612-16Third Party Advisory
https://support.f5.com/csp/article/K90492697Third Party Advisory
https://support.hpe.com/hpsc/doc/public/display?docLocale=en&docId=emr_na-hpesbhf03856en_usThird Party Advisory
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03856en_usThird Party Advisory
https://www.arista.com/en/support/advisories-notices/security-advisories/1749-security-advisory-24Third Party Advisory
https://www.openssl.org/news/secadv/20160922.txtVendor Advisory
https://www.oracle.com/security-alerts/cpuapr2020.htmlThird Party Advisory
https://www.oracle.com/security-alerts/cpujan2020.htmlThird Party Advisory
https://www.oracle.com/security-alerts/cpujul2020.htmlThird Party Advisory
https://www.oracle.com/security-alerts/cpuoct2020.htmlThird Party Advisory
https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.htmlPatch, Third Party Advisory
https://www.tenable.com/security/tns-2016-16Third Party Advisory
https://www.tenable.com/security/tns-2016-20Third Party Advisory
https://www.tenable.com/security/tns-2016-21Third Party Advisory

Timeline

Published: Sep 26, 2016
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2016-6306?

How severe is CVE-2016-6306?

CVE-2016-6306 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 41.68% probability of exploitation in the next 30 days.

How do I fix CVE-2016-6306?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2016-6306?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST