HOME VULNERABILITIESCVE-2016-6306

MEDIUM

CVE-2016-6306

CWE-125Published: September 26, 2016· Updated: Jun 17, 2026

5.9

CVSS v3.1

Official 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.

Technical Analysis

CVE-2016-6306 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 availability disruption (denial of service), 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

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Affected Vendors & Products

Canonical1 product(s)

ubuntu linux

Debian1 product(s)

debian linux

HP4 product(s)

icewall federation agenticewall mcrpicewall ssoicewall sso agent option

Node.js1 product(s)

node.js

novell1 product(s)

suse linux enterprise module for web scripting

OpenSSL1 product(s)

openssl

Source: NVD CPE · 39 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

CVE Program entry

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttp://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html

PATCHhttp://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html

PATCHhttp://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.html

PATCHhttp://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html

PATCHhttp://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html

PATCHhttps://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html

PATCHhttp://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html

PATCHhttp://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html

PATCHhttp://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.html

PATCHhttp://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html

PATCHhttp://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html

PATCHhttps://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html

ADVISORYhttp://kb.juniper.net/InfoCenter/index?page=content&id=JSA10759

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-09/msg00022.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-09/msg00023.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-09/msg00024.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-09/msg00031.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-10/msg00005.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-10/msg00011.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-10/msg00012.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-10/msg00013.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-10/msg00021.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-10/msg00029.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2017-10/msg00010.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2017-10/msg00011.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2018-02/msg00032.html

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2016-1940.html

ADVISORYhttp://seclists.org/fulldisclosure/2017/Jul/31

ADVISORYhttp://www-01.ibm.com/support/docview.wss?uid=swg21995039

ADVISORYhttp://www.debian.org/security/2016/dsa-3673

ADVISORYhttp://www.huawei.com/en/psirt/security-advisories/huawei-sa-20170322-01-openssl-en

ADVISORYhttp://www.oracle.com/technetwork/topics/security/linuxbulletinoct2016-3090545.html

ADVISORYhttp://www.oracle.com/technetwork/topics/security/ovmbulletinoct2016-3090547.html

ADVISORYhttp://www.securityfocus.com/bid/93153

ADVISORYhttp://www.securitytracker.com/id/1036885

ADVISORYhttp://www.ubuntu.com/usn/USN-3087-1

ADVISORYhttp://www.ubuntu.com/usn/USN-3087-2

ADVISORYhttps://access.redhat.com/errata/RHSA-2018:2185

ADVISORYhttps://access.redhat.com/errata/RHSA-2018:2186

ADVISORYhttps://access.redhat.com/errata/RHSA-2018:2187

ADVISORYhttps://bto.bluecoat.com/security-advisory/sa132

ADVISORYhttps://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-c05302448

ADVISORYhttps://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05302448

ADVISORYhttps://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA40312

ADVISORYhttps://kc.mcafee.com/corporate/index?page=content&id=SB10215

ADVISORYhttps://nodejs.org/en/blog/vulnerability/september-2016-security-releases/

ADVISORYhttps://security.FreeBSD.org/advisories/FreeBSD-SA-16:26.openssl.asc

ADVISORYhttps://security.gentoo.org/glsa/201612-16

ADVISORYhttps://support.f5.com/csp/article/K90492697

ADVISORYhttps://support.hpe.com/hpsc/doc/public/display?docLocale=en&docId=emr_na-hpesbhf03856en_us

ADVISORYhttps://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03856en_us

ADVISORYhttps://www.arista.com/en/support/advisories-notices/security-advisories/1749-security-advisory-24

ADVISORYhttps://www.openssl.org/news/secadv/20160922.txt

ADVISORYhttps://www.oracle.com/security-alerts/cpuapr2020.html

ADVISORYhttps://www.oracle.com/security-alerts/cpujan2020.html

ADVISORYhttps://www.oracle.com/security-alerts/cpujul2020.html

ADVISORYhttps://www.oracle.com/security-alerts/cpuoct2020.html

ADVISORYhttps://www.tenable.com/security/tns-2016-16

ADVISORYhttps://www.tenable.com/security/tns-2016-20

ADVISORYhttps://www.tenable.com/security/tns-2016-21

ADVISORYhttp://kb.juniper.net/InfoCenter/index?page=content&id=JSA10759

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-09/msg00022.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-09/msg00023.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-09/msg00024.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-09/msg00031.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-10/msg00005.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-10/msg00011.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-10/msg00012.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-10/msg00013.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-10/msg00021.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2016-10/msg00029.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2017-10/msg00010.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2017-10/msg00011.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2018-02/msg00032.html

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2016-1940.html

ADVISORYhttp://seclists.org/fulldisclosure/2017/Jul/31

ADVISORYhttp://www-01.ibm.com/support/docview.wss?uid=swg21995039

ADVISORYhttp://www.debian.org/security/2016/dsa-3673

ADVISORYhttp://www.huawei.com/en/psirt/security-advisories/huawei-sa-20170322-01-openssl-en

ADVISORYhttp://www.oracle.com/technetwork/topics/security/linuxbulletinoct2016-3090545.html

ADVISORYhttp://www.oracle.com/technetwork/topics/security/ovmbulletinoct2016-3090547.html

ADVISORYhttp://www.securityfocus.com/bid/93153

ADVISORYhttp://www.securitytracker.com/id/1036885

ADVISORYhttp://www.ubuntu.com/usn/USN-3087-1

ADVISORYhttp://www.ubuntu.com/usn/USN-3087-2

ADVISORYhttps://access.redhat.com/errata/RHSA-2018:2185

ADVISORYhttps://access.redhat.com/errata/RHSA-2018:2186

ADVISORYhttps://access.redhat.com/errata/RHSA-2018:2187

ADVISORYhttps://bto.bluecoat.com/security-advisory/sa132

ADVISORYhttps://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-c05302448

ADVISORYhttps://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05302448

ADVISORYhttps://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA40312

ADVISORYhttps://kc.mcafee.com/corporate/index?page=content&id=SB10215

ADVISORYhttps://nodejs.org/en/blog/vulnerability/september-2016-security-releases/

ADVISORYhttps://security.FreeBSD.org/advisories/FreeBSD-SA-16:26.openssl.asc

ADVISORYhttps://security.gentoo.org/glsa/201612-16

ADVISORYhttps://support.f5.com/csp/article/K90492697

ADVISORYhttps://support.hpe.com/hpsc/doc/public/display?docLocale=en&docId=emr_na-hpesbhf03856en_us

ADVISORYhttps://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03856en_us

ADVISORYhttps://www.arista.com/en/support/advisories-notices/security-advisories/1749-security-advisory-24

ADVISORYhttps://www.openssl.org/news/secadv/20160922.txt

ADVISORYhttps://www.oracle.com/security-alerts/cpuapr2020.html

ADVISORYhttps://www.oracle.com/security-alerts/cpujan2020.html

ADVISORYhttps://www.oracle.com/security-alerts/cpujul2020.html

ADVISORYhttps://www.oracle.com/security-alerts/cpuoct2020.html

ADVISORYhttps://www.tenable.com/security/tns-2016-16

ADVISORYhttps://www.tenable.com/security/tns-2016-20

ADVISORYhttps://www.tenable.com/security/tns-2016-21

All References (112)

→

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

Quick Facts

CVE IDCVE-2016-6306

CVSS Score5.9 / 10

SeverityMEDIUM

WeaknessCWE-125

CISA KEVNo

Affected6 vendor(s)

PublishedSep 26, 2016

Related CVEs (CWE-125)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2016-6306 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.COM. CVE data is provided under the NVD usage policy.

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