CVE-2016-2181

Description

The Anti-Replay feature in the DTLS implementation in OpenSSL before 1.1.0 mishandles early use of a new epoch number in conjunction with a large sequence number, which allows remote attackers to cause a denial of service (false-positive packet drops) via spoofed DTLS records, related to rec_layer_d1.c and ssl3_record.c.

Category

7.5
CVSS
Severity: High
CVSS 3.0 •
CVSS 2.0 •
EPSS 23.03% Top 5%
Vendor Advisory redhat.com Vendor Advisory FreeBSD.org Vendor Advisory opensuse.org Vendor Advisory ubuntu.com Vendor Advisory opensuse.org Vendor Advisory opensuse.org Vendor Advisory ubuntu.com Vendor Advisory opensuse.org Vendor Advisory opensuse.org Vendor Advisory opensuse.org Vendor Advisory debian.org Vendor Advisory opensuse.org Vendor Advisory opensuse.org Vendor Advisory opensuse.org Vendor Advisory opensuse.org Vendor Advisory opensuse.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://www.securityfocus.com/bid/92982 vdb entry third party advisory
https://www.tenable.com/security/tns-2016-20
http://www.splunk.com/view/SP-CAAAPUE third party advisory
http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
http://rhn.redhat.com/errata/RHSA-2016-1940.html vendor advisory
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2016-3090545.html third party advisory
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA40312 third party advisory
http://www.splunk.com/view/SP-CAAAPSV third party advisory
http://www-01.ibm.com/support/docview.wss?uid=swg21995039 third party advisory
http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html third party advisory
https://www.tenable.com/security/tns-2016-16 third party advisory
https://www.tenable.com/security/tns-2016-21
http://www.securitytracker.com/id/1036690 vdb entry
http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html
https://git.openssl.org/?p=openssl.git%3Ba=commit%3Bh=1fb9fdc3027b27d8eb6a1e6a846435b070980770
http://www.oracle.com/technetwork/topics/security/ovmbulletinoct2016-3090547.html third party advisory
https://bto.bluecoat.com/security-advisory/sa132 third party advisory
http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.html
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:26.openssl.asc vendor advisory
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10759 third party advisory
https://kc.mcafee.com/corporate/index?page=content&id=SB10215
http://lists.opensuse.org/opensuse-security-announce/2017-10/msg00011.html vendor advisory
http://www.ubuntu.com/usn/USN-3087-1 vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00012.html vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00029.html vendor advisory
http://www.ubuntu.com/usn/USN-3087-2 vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2017-10/msg00010.html vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2016-09/msg00031.html vendor advisory
http://seclists.org/fulldisclosure/2017/Jul/31 mailing list
http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00005.html vendor advisory
https://support.f5.com/csp/article/K59298921
http://www.debian.org/security/2016/dsa-3673 vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2016-09/msg00023.html vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2018-02/msg00032.html vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2016-09/msg00022.html vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00011.html vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2016-09/msg00024.html vendor advisory
http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20170322-01-openssl-en
https://www.arista.com/en/support/advisories-notices/security-advisories/1749-security-advisory-24
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf

Frequently Asked Questions

What is the severity of CVE-2016-2181?
CVE-2016-2181 has been scored as a high severity vulnerability.
How to fix CVE-2016-2181?
To fix CVE-2016-2181, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2016-2181 being actively exploited in the wild?
It is possible that CVE-2016-2181 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~23% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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