---
title: "CVE-2016-2181\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2016-2181?format=md
keywords: index, follow
---

# CVE-2016-2181

Publication date 16 September 2016

Last updated 25 August 2025

---

Ubuntu priority

**Low**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**7.5 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2016-2181?format=md#impact-score)

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## 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.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| openssl | 19.04 disco | Fixed 1.0.2g-1ubuntu9 |
| 18.10 cosmic | Fixed 1.0.2g-1ubuntu9 |
| 18.04 LTS bionic | Fixed 1.0.2g-1ubuntu9 |
| 17.10 artful | Fixed 1.0.2g-1ubuntu9 |
| 17.04 zesty | Fixed 1.0.2g-1ubuntu9 |
| 16.10 yakkety | Fixed 1.0.2g-1ubuntu9 |
| 16.04 LTS xenial | Fixed 1.0.2g-1ubuntu4.4 |
| 14.04 LTS trusty | Fixed 1.0.1f-1ubuntu2.20 |
| 12.04 LTS precise | Fixed 1.0.1-4ubuntu5.37 |
| openssl098 | 19.04 disco | Not in release |
| 18.10 cosmic | Not in release |
| 18.04 LTS bionic | Not in release |
| 17.10 artful | Not in release |
| 17.04 zesty | Not in release |
| 16.10 yakkety | Not in release |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release |
| 12.04 LTS precise | Ignored end of life |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)
* [Patch details](https://ubuntu.com/security/CVE-2016-2181?format=md#patch-details)

### Patch details

For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)

| Package | Patch details |
| --- | --- |
| openssl | * Upstream:   <https://git.openssl.org/?p=openssl.git;a=commit;h=fa75569758298e2930c78989b516cac937118acc> * Upstream:   <https://git.openssl.org/?p=openssl.git;a=commit;h=b77ab018b79a00f789b0fb85596b446b08be4c9d> * Upstream:   <https://git.openssl.org/?p=openssl.git;a=commit;h=5802758eb480c5f14a768f6a061df1dd20aec8c4> * Upstream:   <https://git.openssl.org/?p=openssl.git;a=commit;h=20744f6b40b5ded059a848f66d6ba922f2a62eb3> * Upstream:   <https://git.openssl.org/?p=openssl.git;a=commit;h=3884b47b7c255c2e94d9b387ee83c7e8bb981258> * Upstream:   <https://git.openssl.org/?p=openssl.git;a=commit;h=26aebca74e38ae09f673c2045cc8e2ef762d265a> |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

7.5 · High

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Privileges required | None |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | None |
  | Integrity impact | None |
  | Availability impact | High |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 7.5 · High |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2181)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2016-2181)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2016-2181)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2016-2181)

### Related Ubuntu Security Notices (USN)

+ [USN-3087-1](https://usn.ubuntu.com/USN-3087-1)
+ OpenSSL vulnerabilities
+ 22 September 2016

### Other references

* <https://www.openssl.org/news/secadv/20160922.txt>
* <https://www.cve.org/CVERecord?id=CVE-2016-2181>