CVE-2019-8336: HashiCorp Consul (and Consul Enterprise) 1.4.x before 1.4.3 allows a client to bypass intended access restrict

This month

HIGH 8.1REMOTEUPGRADE

CVE-2019-8336 is a high-severity flaw (CVSS 8.1) affecting consul. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

HashiCorp Consul (and Consul Enterprise) 1.4.x before 1.4.3 allows a client to bypass intended access restrictions and obtain the privileges of one other arbitrary token within secondary datacenters, because a token with literally "<hidden>" as its secret is used in unusual circumstances.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.3% (top 31%)
CISA exploited list	No
Published	2019-03-05
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: hashicorp

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

Am I affected?

Timeline

2019-03-05 23:29 UTCPublished CVE record published
2026-06-17 02:41 UTCUpdated Record last modified

hashicorp consul UPGRADE

Affected: >= 1.4.0 and < 1.4.3

Fixed in: 1.4.3

Safe to downgrade to: a release before 1.4.0

1. Check installed version

apt-cache policy consul || rpm -q consul || consul --version

2. UPGRADE to 1.4.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade consul

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade consul

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 1.4.0 (Debian / Ubuntu)

apt-cache madison consul sudo apt install consul=<VERSION_BEFORE_1.4.0> sudo apt-mark hold consul

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list consul sudo dnf downgrade consul-<VERSION_BEFORE_1.4.0> sudo dnf versionlock add consul

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.

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-2019-8336?

consul: upgrade to 1.4.3. Exact commands for each OS are on this page.

Is CVE-2019-8336 being exploited?

CVE-2019-8336 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-2019-8336 affect?

CVE-2019-8336 affects consul. Severity is high (CVSS 8.1). HashiCorp Consul (and Consul Enterprise) 1.4.x before 1.4.3 allows a client to bypass intended access restrictions and obtain the privileges of one other arbitrary token within secondary datacenters, because a token with literally "<hidden>

How urgent is CVE-2019-8336?

Priority 51/100. High severity; Remotely exploitable, no login, no user action

Software pages

Consul vulnerabilities

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References

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