CVE-2018-1111: DHCP packages in Red Hat Enterprise Linux 6 and 7, Fedora 28, and earlier are vulnerable to a command injectio

This week

HIGH 7.5WATCHLISTMITIGATEDOWNGRADEDOWNGRADE

CVE-2018-1111 is a high-severity flaw (CVSS 7.5) affecting fedora, enterprise virtualization, enterprise virtualization host. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

DHCP packages in Red Hat Enterprise Linux 6 and 7, Fedora 28, and earlier are vulnerable to a command injection flaw in the NetworkManager integration script included in the DHCP client. A malicious DHCP server, or an attacker on the local network able to spoof DHCP responses, could use this flaw to execute arbitrary commands with root privileges on systems using NetworkManager and configured to obtain network configuration using the DHCP protoco

Why this priority

High severity
EPSS top 1%: very likely to be exploited
Public exploit reference
On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Adjacent network
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	97.9% (top 1%)
CISA exploited list	No
Weakness	CWE-77, CWE-78
Published	2018-05-17
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: fedoraproject · redhat

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-05-17 16:29 UTCPublished CVE record published
2026-06-17 01:50 UTCUpdated Record last modified

fedoraproject fedora MITIGATE

Affected: 26 · 27 · 28

Fixed in: no fixed release known

Safe to downgrade to: a release before 26

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

redhat enterprise virtualization DOWNGRADE

Affected: 4.0 · 4.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0

1. Check installed version

apt-cache policy enterprise-virtualization || rpm -q enterprise-virtualization || enterprise-virtualization --version

2. No fixed release: DOWNGRADE to a release before 4.0 (Debian / Ubuntu)

apt-cache madison enterprise-virtualization sudo apt install enterprise-virtualization=<VERSION_BEFORE_4.0> sudo apt-mark hold enterprise-virtualization

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list enterprise-virtualization sudo dnf downgrade enterprise-virtualization-<VERSION_BEFORE_4.0> sudo dnf versionlock add enterprise-virtualization

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

redhat enterprise virtualization host DOWNGRADE

Affected: 4.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0

1. Check installed version

apt-cache policy enterprise-virtualization-host || rpm -q enterprise-virtualization-host || enterprise-virtualization-host --version

2. No fixed release: DOWNGRADE to a release before 4.0 (Debian / Ubuntu)

apt-cache madison enterprise-virtualization-host sudo apt install enterprise-virtualization-host=<VERSION_BEFORE_4.0> sudo apt-mark hold enterprise-virtualization-host

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list enterprise-virtualization-host sudo dnf downgrade enterprise-virtualization-host-<VERSION_BEFORE_4.0> sudo dnf versionlock add enterprise-virtualization-host

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

redhat enterprise linux MITIGATE

Affected: 6.0 · 6.4 · 6.5 · 6.6 · 6.7 · 7.0 · 7.2 · 7.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

redhat enterprise linux desktop MITIGATE

Affected: 6.0 · 7.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

redhat enterprise linux server MITIGATE

Affected: 6.0 · 7.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: DynoRoot DHCP Client - Command Injection
Exploit-DB: DHCP Client - Command Injection 'DynoRoot' (Metasploit)
Metasploit: DHCP Client Command Injection (DynoRoot)

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2018-1111?

fedora: mitigate or apply the listed mitigation; enterprise virtualization: downgrade or apply the listed mitigation; enterprise virtualization host: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-1111 being exploited?

CVE-2018-1111 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2018-1111 affect?

CVE-2018-1111 affects fedora, enterprise virtualization, enterprise virtualization host. Severity is high (CVSS 7.5). DHCP packages in Red Hat Enterprise Linux 6 and 7, Fedora 28, and earlier are vulnerable to a command injection flaw in the NetworkManager integration script included in the DHCP client. A malicious DHCP server, or an attacker on the local

How urgent is CVE-2018-1111?

Priority 61/100. High severity; EPSS top 1%: very likely to be exploited; Public exploit reference; On your watchlist

Software pages

Red Hat Enterprise Linux vulnerabilities

Related CVEs

CVE-2023-42756 MEDIUM 4.4 UPGRADE MITIGATE A flaw was found in the Netfilter subsystem of the Linux kernel
CVE-2024-3056 HIGH 7.7 UPGRADE DOWNGRADE A flaw was found in Podman
CVE-2023-2462 MEDIUM 4.3 UPGRADE MITIGATE Inappropriate implementation in Prompts in Google Chrome prior to 113.0.5672.63 allowed a remote attacker to o
CVE-2023-2468 MEDIUM 4.3 UPGRADE MITIGATE Inappropriate implementation in PictureInPicture in Google Chrome prior to 113.0.5672.63 allowed a remote atta
CVE-2026-35093 HIGH 8.8 UPGRADE MITIGATE A flaw was found in libinput

References

← Back to latest CVEs