CVE-2020-25864: HashiCorp Consul and Consul Enterprise up to version 1.9.4 key-value (KV) raw mode was vulnerable to cross-sit

Q: How do I fix CVE-2020-25864?

consul: upgrade to 1.7.14, 1.8.10, 1.9.5. Exact commands for each OS are on this page.

Q: Is CVE-2020-25864 being exploited?

CVE-2020-25864 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-25864 affect?

CVE-2020-25864 affects consul. Severity is medium (CVSS 6.1). HashiCorp Consul and Consul Enterprise up to version 1.9.4 key-value (KV) raw mode was vulnerable to cross-site scripting. Fixed in 1.9.5, 1.8.10 and 1.7.14.

Q: How urgent is CVE-2020-25864?

Priority 45/100. EPSS top 7%: very likely to be exploited

This month

MEDIUM 6.1UPGRADE

CVE-2020-25864 is a medium-severity flaw (CVSS 6.1) 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 up to version 1.9.4 key-value (KV) raw mode was vulnerable to cross-site scripting. Fixed in 1.9.5, 1.8.10 and 1.7.14.

Why this priority

EPSS top 7%: very likely to be exploited

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	6.1% (top 7%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-04-20
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

2021-04-20 16:15 UTCPublished CVE record published
2026-06-17 03:07 UTCUpdated Record last modified

hashicorp consul UPGRADE

Affected: < 1.7.14 · >= 1.8.0 and < 1.8.10 · >= 1.9.0 and < 1.9.5

Fixed in: 1.7.14, 1.8.10, 1.9.5

Safe to downgrade to: a release before 1.8.0

1. Check installed version

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

2. UPGRADE to 1.7.14 (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 1.8.0 (Debian / Ubuntu)

apt-cache madison consul sudo apt install consul=<VERSION_BEFORE_1.8.0> 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_1.8.0> 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.

Public exploits and detection

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

Nuclei scan template: HashiCorp Consul/Consul Enterprise <=1.9.4 - Cross-Site Scripting

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-2020-25864?

consul: upgrade to 1.7.14, 1.8.10, 1.9.5. Exact commands for each OS are on this page.

Is CVE-2020-25864 being exploited?

CVE-2020-25864 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-2020-25864 affect?

CVE-2020-25864 affects consul. Severity is medium (CVSS 6.1). HashiCorp Consul and Consul Enterprise up to version 1.9.4 key-value (KV) raw mode was vulnerable to cross-site scripting. Fixed in 1.9.5, 1.8.10 and 1.7.14.

How urgent is CVE-2020-25864?

Priority 45/100. EPSS top 7%: very likely to be exploited

Software pages

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References

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