CVE-2016-2774

Name: CVE-2016-2774
Creator: NVD / NIST
Published: 2016-03-09T15:59:00.147+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.9/10EPSS 73.70%

Last modified Jun 17, 2026

CVE-2016-2774 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. 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.. EPSS estimates a 73.70% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.9/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

73.70%

99.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Isc	Dhcp	4.1-esv
Isc	Dhcp	4.1.0
Isc	Dhcp	4.1.1
Isc	Dhcp	4.1.2
Isc	Dhcp	4.2.0
Isc	Dhcp	4.2.1
Isc	Dhcp	4.2.2
Isc	Dhcp	4.2.3
Isc	Dhcp	4.2.4
Isc	Dhcp	4.2.5
Isc	Dhcp	4.2.6
Isc	Dhcp	4.2.7
Isc	Dhcp	4.2.8
Isc	Dhcp	4.3.0
Isc	Dhcp	4.3.1
Isc	Dhcp	4.3.2
Isc	Dhcp	4.3.3
Debian	Debian Linux	8.0
Canonical	Ubuntu Linux	14.04
Canonical	Ubuntu Linux	16.04
Canonical	Ubuntu Linux	17.10

References

http://lists.fedoraproject.org/pipermail/package-announce/2016-May/183458.htmlThird Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2016-May/183640.htmlThird Party Advisory
http://lists.opensuse.org/opensuse-updates/2016-07/msg00066.htmlMailing List, Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-2590.htmlThird Party Advisory
http://www.oracle.com/technetwork/topics/security/bulletinjul2016-3090568.htmlThird Party Advisory
http://www.securityfocus.com/bid/84208Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1035196Third Party Advisory, VDB Entry
https://kb.isc.org/article/AA-01354Vendor Advisory
https://lists.debian.org/debian-lts-announce/2019/11/msg00023.htmlThird Party Advisory
https://usn.ubuntu.com/3586-1/Third Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2016-May/183458.htmlThird Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2016-May/183640.htmlThird Party Advisory
http://lists.opensuse.org/opensuse-updates/2016-07/msg00066.htmlMailing List, Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-2590.htmlThird Party Advisory
http://www.oracle.com/technetwork/topics/security/bulletinjul2016-3090568.htmlThird Party Advisory
http://www.securityfocus.com/bid/84208Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1035196Third Party Advisory, VDB Entry
https://kb.isc.org/article/AA-01354Vendor Advisory
https://lists.debian.org/debian-lts-announce/2019/11/msg00023.htmlThird Party Advisory
https://usn.ubuntu.com/3586-1/Third Party Advisory

Timeline

Published: Mar 9, 2016
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2016-2774?

How severe is CVE-2016-2774?

CVE-2016-2774 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 73.70% probability of exploitation in the next 30 days.

How do I fix CVE-2016-2774?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST