CVE-2020-28053: HashiCorp Consul and Consul Enterprise 1.2.0 up to 1.8.5 allowed operators with operator:read ACL permissions

This month

MEDIUM 6.5UPGRADE

CVE-2020-28053 is a medium-severity flaw (CVSS 6.5) 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 1.2.0 up to 1.8.5 allowed operators with operator:read ACL permissions to read the Connect CA private key configuration. Fixed in 1.6.10, 1.7.10, and 1.8.6.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.5% (top 27%)
CISA exploited list	No
Weakness	CWE-863
Published	2020-11-23
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

2020-11-23 14:15 UTCPublished CVE record published
2026-06-17 03:10 UTCUpdated Record last modified

hashicorp consul UPGRADE

Affected: >= 1.2.0 and < 1.6.10 · >= 1.7.0 and < 1.7.10 · >= 1.8.0 and < 1.8.6

Fixed in: 1.6.10, 1.7.10, 1.8.6

Safe to downgrade to: a release before 1.2.0

1. Check installed version

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

2. UPGRADE to 1.6.10 (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 1.2.0 (Debian / Ubuntu)

apt-cache madison consul sudo apt install consul=<VERSION_BEFORE_1.2.0> 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_1.2.0> 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-2020-28053?

consul: upgrade to 1.6.10, 1.7.10, 1.8.6. Exact commands for each OS are on this page.

Is CVE-2020-28053 being exploited?

CVE-2020-28053 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-2020-28053 affect?

CVE-2020-28053 affects consul. Severity is medium (CVSS 6.5). HashiCorp Consul and Consul Enterprise 1.2.0 up to 1.8.5 allowed operators with operator:read ACL permissions to read the Connect CA private key configuration. Fixed in 1.6.10, 1.7.10, and 1.8.6.

How urgent is CVE-2020-28053?

Priority 41/100. No elevated risk signals yet.

Software pages

Consul vulnerabilities

Related CVEs

CVE-2025-11374 MEDIUM 6.5 UPGRADE Consul and Consul Enterprise’s (“Consul”) key/value endpoint is vulnerable to denial of service (DoS) due to i
CVE-2025-11375 MEDIUM 6.5 UPGRADE Consul and Consul Enterprise’s (“Consul”) event endpoint is vulnerable to denial of service (DoS) due to lack
CVE-2024-10086 MEDIUM 6.1 UPGRADE A vulnerability was identified in Consul and Consul Enterprise such that the server response did not explicitl
CVE-2024-10006 HIGH 8.3 UPGRADE A vulnerability was identified in Consul and Consul Enterprise (“Consul”) such that using Headers in L7 traffi
CVE-2024-10005 HIGH 8.1 UPGRADE A vulnerability was identified in Consul and Consul Enterprise (“Consul”) such that using URL paths in L7 traf

References

← Back to latest CVEs