CVE-2016-6302
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.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 27.8%, higher than 98% of all known CVEs. Patch or mitigate before the next change window.
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
- 7.5 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 27.81% probability · 98th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- openssl/openssl · oracle/linux · oracle/solaris
- Source
- secalert@redhat.com
EPSS 27.8% since 4 November 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10759Third Party Advisory
- http://rhn.redhat.com/errata/RHSA-2016-1940.html
- http://www-01.ibm.com/support/docview.wss?uid=swg21995039Third 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.htmlPatch, Third Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
- http://www.oracle.com/technetwork/topics/security/bulletinoct2016-3090566.htmlPatch, Third Party Advisory
- http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2016-3090545.htmlPatch, Third Party Advisory
- http://www.oracle.com/technetwork/topics/security/ovmbulletinoct2016-3090547.htmlPatch, Third Party Advisory
- http://www.securityfocus.com/bid/92628Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1036885
- http://www.splunk.com/view/SP-CAAAPSVThird Party Advisory
- http://www.splunk.com/view/SP-CAAAPUEThird 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/sa132Third 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/SA40312Third Party Advisory
- https://security.FreeBSD.org/advisories/FreeBSD-SA-16:26.openssl.asc
- https://www.tenable.com/security/tns-2016-16Third 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=JSA10759Third Party Advisory
- http://rhn.redhat.com/errata/RHSA-2016-1940.html
- http://www-01.ibm.com/support/docview.wss?uid=swg21995039Third Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.