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CVE-2016-2181

7.5 · HIGH

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 c…

Published Sep 16, 2016CWE-189EPSS 22.63%

Overview

CVE-2016-2181 is a high-severity vulnerability. It was published on September 16, 2016 and has a CVSS 3.0 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.0 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refkb.juniper.net/InfoCenter/index?page=content&id=JSA10759Reflists.opensuse.org/opensuse-security-announce/2016-09/msg00022.htmlReflists.opensuse.org/opensuse-security-announce/2016-09/msg00023.htmlReflists.opensuse.org/opensuse-security-announce/2016-09/msg00024.htmlReflists.opensuse.org/opensuse-security-announce/2016-09/msg00031.htmlReflists.opensuse.org/opensuse-security-announce/2016-10/msg00005.htmlReflists.opensuse.org/opensuse-security-announce/2016-10/msg00011.htmlReflists.opensuse.org/opensuse-security-announce/2016-10/msg00012.htmlReflists.opensuse.org/opensuse-security-announce/2016-10/msg00029.htmlReflists.opensuse.org/opensuse-security-announce/2017-10/msg00010.html

How CyberStrike helps

Frequently asked questions

What is CVE-2016-2181?

CVE-2016-2181 is a high-severity vulnerability. It was published on September 16, 2016 and has a CVSS 3.0 base score of 7.5 (HIGH).

How severe is CVE-2016-2181?

This vulnerability has a CVSS 3.0 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2016-2181?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2016-2181?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2016-2181 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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