CVE-2016-2774

Publication date 9 March 2016

Last updated 25 August 2025

Ubuntu priority

Low

Why this priority?

Cvss 3 Severity Score

5.9 · Medium

Score breakdown

Description

ISC DHCP 4.1.x before 4.1-ESV-R13 and 4.2.x and 4.3.x before 4.3.4 does not restrict the number of concurrent TCP sessions, which allows remote attackers to cause a denial of service (INSIST assertion failure or request-processing outage) by establishing many sessions.

Read the notes from the security team

Status

Package Ubuntu Release Status
isc-dhcp 21.04 hirsute
Not affected
20.10 groovy
Not affected
20.04 LTS focal
Not affected
19.10 eoan
Not affected
19.04 disco
Not affected
18.10 cosmic
Not affected
18.04 LTS bionic
Not affected
17.10 artful
Not affected
17.04 zesty Ignored end of life
16.10 yakkety Ignored end of life
16.04 LTS xenial
Fixed 4.3.3-5ubuntu12.9
15.10 wily Ignored end of life
14.04 LTS trusty
Fixed 4.2.4-7ubuntu12.12
12.04 LTS precise Ignored end of life

Notes

mdeslaur

DoS over OMAPI and failover ports only, see ISC kb article for workarounds, or properly limit access to ports

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
isc-dhcp

Severity score breakdown

Parameter Value
Base score 5.9 · Medium
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

Other references