--- title: "CVE-2016-6304: Multiple memory leaks in t1_lib.c… | CubePath" description: "Multiple memory leaks in t1_lib.c in OpenSSL before 1.0.1u, 1.0.2 before 1.0.2i, and 1.1.0 before 1.1.0a allow remote attackers to cause a denial…" language: en source: https://cubepath.com/security/cve/CVE-2016-6304 --- # CVE-2016-6304: Multiple memory leaks in t1_lib.c… | CubePath ## Description Multiple memory leaks in t1\_lib.c in OpenSSL before 1.0.1u, 1.0.2 before 1.0.2i, and 1.1.0 before 1.1.0a allow remote attackers to cause a denial of service (memory consumption) via large OCSP Status Request extensions. Official description from the CVE record, published by redhat. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2016-6304) ## Key data ### EPSS Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days. Score 0.63029 (63.0% probability) Percentile 99.2% Scores of Nov 10, 2026 Model v2026.06.15 ## References Links listed in the CVE record. They lead to other sites, which CubePath does not control. - [openssl.org/news/secadv/20160922.txt](https://www.openssl.org/news/secadv/20160922.txt) - [tenable.com/security/tns-2016-20](https://www.tenable.com/security/tns-2016-20) - [splunk.com/view/SP-CAAAPUE](http://www.splunk.com/view/SP-CAAAPUE) - [oracle.com/technetwork/security-advisory/cpujan2018-3236628…](http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html) - [RHSA-2017:1659](http://rhn.redhat.com/errata/RHSA-2017-1659.html) (rhn.redhat.com) vendor-advisory - [RHSA-2017:1658](https://access.redhat.com/errata/RHSA-2017:1658) (access.redhat.com) vendor-advisory - [RHSA-2016:1940](http://rhn.redhat.com/errata/RHSA-2016-1940.html) (rhn.redhat.com) vendor-advisory - [93150](http://www.securityfocus.com/bid/93150) (securityfocus.com) vdb-entry - [oracle.com/technetwork/topics/security/linuxbulletinoct2016…](http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2016-3090545.html) - [RHSA-2016:2802](http://rhn.redhat.com/errata/RHSA-2016-2802.html) (rhn.redhat.com) vendor-advisory - [GLSA-201612-16](https://security.gentoo.org/glsa/201612-16) (security.gentoo.org) vendor-advisory - [RHSA-2017:1801](https://access.redhat.com/errata/RHSA-2017:1801) (access.redhat.com) vendor-advisory - [kb.pulsesecure.net/articles/Pulse\_Security\_Advisories/SA403…](https://kb.pulsesecure.net/articles/Pulse%5FSecurity%5FAdvisories/SA40312) - [1036878](http://www.securitytracker.com/id/1036878) (securitytracker.com) vdb-entry - [splunk.com/view/SP-CAAAPSV](http://www.splunk.com/view/SP-CAAAPSV) - [RHSA-2017:1413](https://access.redhat.com/errata/RHSA-2017:1413) (access.redhat.com) vendor-advisory - [www-01.ibm.com/support/docview.wss?uid=swg21995039](http://www-01.ibm.com/support/docview.wss?uid=swg21995039) - [oracle.com/technetwork/security-advisory/cpuoct2016-2881722…](http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html) - [nodejs.org/en/blog/vulnerability/september-2016-security-re…](https://nodejs.org/en/blog/vulnerability/september-2016-security-releases/) - [tenable.com/security/tns-2016-16](https://www.tenable.com/security/tns-2016-16) - [RHSA-2017:2494](https://access.redhat.com/errata/RHSA-2017:2494) (access.redhat.com) vendor-advisory - [1037640](http://www.securitytracker.com/id/1037640) (securitytracker.com) vdb-entry - [tenable.com/security/tns-2016-21](https://www.tenable.com/security/tns-2016-21) - [kc.mcafee.com/corporate/index?page=content&id=SB10171](https://kc.mcafee.com/corporate/index?page=content&id=SB10171) - [oracle.com/technetwork/security-advisory/cpuoct2017-3236626…](http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html) - [git.openssl.org/?p=openssl.git%3Ba=commit%3Bh=2c0d295e26306…](https://git.openssl.org/?p=openssl.git%3Ba=commit%3Bh=2c0d295e26306e15a92eb23a84a1802005c1c137) - [oracle.com/technetwork/security-advisory/cpuapr2018-3678067…](http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html) - [RHSA-2017:1414](https://access.redhat.com/errata/RHSA-2017:1414) (access.redhat.com) vendor-advisory - [oracle.com/technetwork/topics/security/ovmbulletinoct2016-3…](http://www.oracle.com/technetwork/topics/security/ovmbulletinoct2016-3090547.html) - [bto.bluecoat.com/security-advisory/sa132](https://bto.bluecoat.com/security-advisory/sa132) - [RHSA-2017:1415](http://rhn.redhat.com/errata/RHSA-2017-1415.html) (rhn.redhat.com) vendor-advisory - [oracle.com/technetwork/security-advisory/cpujul2017-3236622…](http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.html) - [FreeBSD-SA-16:26](https://security.FreeBSD.org/advisories/FreeBSD-SA-16:26.openssl.asc) (security.freebsd.org) vendor-advisory - [SUSE-SU-2016:2470](http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00013.html) (lists.opensuse.org) vendor-advisory - [RHSA-2017:1802](https://access.redhat.com/errata/RHSA-2017:1802) (access.redhat.com) vendor-advisory - [kb.juniper.net/InfoCenter/index?page=content&id=JSA10759](http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10759) - [RHSA-2017:2493](https://access.redhat.com/errata/RHSA-2017:2493) (access.redhat.com) vendor-advisory - [kc.mcafee.com/corporate/index?page=content&id=SB10215](https://kc.mcafee.com/corporate/index?page=content&id=SB10215) - [SUSE-SU-2017:2700](http://lists.opensuse.org/opensuse-security-announce/2017-10/msg00011.html) (lists.opensuse.org) vendor-advisory - [USN-3087-1](http://www.ubuntu.com/usn/USN-3087-1) (ubuntu.com) vendor-advisory - [SUSE-SU-2016:2469](http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00012.html) (lists.opensuse.org) vendor-advisory - [openSUSE-SU-2016:2537](http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00029.html) (lists.opensuse.org) vendor-advisory - [20161012 New OpenSSL double-free and invalid free vulnerabilities in X509 parsing](http://seclists.org/fulldisclosure/2016/Oct/62) (seclists.org) mailing-list - [USN-3087-2](http://www.ubuntu.com/usn/USN-3087-2) (ubuntu.com) vendor-advisory - [20161214 APPLE-SA-2016-12-13-1 macOS 10.12.2](http://seclists.org/fulldisclosure/2016/Dec/47) (seclists.org) mailing-list - [SUSE-SU-2017:2699](http://lists.opensuse.org/opensuse-security-announce/2017-10/msg00010.html) (lists.opensuse.org) vendor-advisory - [openSUSE-SU-2016:2407](http://lists.opensuse.org/opensuse-security-announce/2016-09/msg00031.html) (lists.opensuse.org) vendor-advisory - [20170717 Orion Elite Hidden IP Browser Pro - All Versions - Multiple Known Vulnerabilities](http://seclists.org/fulldisclosure/2017/Jul/31) (seclists.org) mailing-list - [SUSE-SU-2016:2458](http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00005.html) (lists.opensuse.org) vendor-advisory - [DSA-3673](http://www.debian.org/security/2016/dsa-3673) (debian.org) vendor-advisory - [openSUSE-SU-2016:2391](http://lists.opensuse.org/opensuse-security-announce/2016-09/msg00023.html) (lists.opensuse.org) vendor-advisory - [openSUSE-SU-2018:0458](http://lists.opensuse.org/opensuse-security-announce/2018-02/msg00032.html) (lists.opensuse.org) vendor-advisory - [packetstormsecurity.com/files/139091/OpenSSL-x509-Parsing-D…](http://packetstormsecurity.com/files/139091/OpenSSL-x509-Parsing-Double-Free-Invalid-Free.html) - [SUSE-SU-2016:2387](http://lists.opensuse.org/opensuse-security-announce/2016-09/msg00022.html) (lists.opensuse.org) vendor-advisory - [openSUSE-SU-2016:2788](http://lists.opensuse.org/opensuse-security-announce/2016-11/msg00027.html) (lists.opensuse.org) vendor-advisory - [SUSE-SU-2016:2468](http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00011.html) (lists.opensuse.org) vendor-advisory - [openSUSE-SU-2016:2769](http://lists.opensuse.org/opensuse-security-announce/2016-11/msg00021.html) (lists.opensuse.org) vendor-advisory - [openSUSE-SU-2016:2496](http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00021.html) (lists.opensuse.org) vendor-advisory - [SUSE-SU-2016:2394](http://lists.opensuse.org/opensuse-security-announce/2016-09/msg00024.html) (lists.opensuse.org) vendor-advisory - [huawei.com/en/psirt/security-advisories/huawei-sa-20170322-…](http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20170322-01-openssl-en) - [arista.com/en/support/advisories-notices/security-advisorie…](https://www.arista.com/en/support/advisories-notices/security-advisories/1749-security-advisory-24) - [cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf](https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf) ## Timeline 1. ID reserved Jul 26, 2016 2. Record published Sep 26, 2016 3. Record last updated Aug 6, 2024 ## Look up another CVE ## About CubePath CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection. [Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection) Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:58 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)