CVE-2025-11374: Consul and Consul Enterprise’s (“Consul”) key/value endpoint is vulnerable to denial of service (DoS) due to i

Routine

MEDIUM 6.5UPGRADE

CVE-2025-11374 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.

Consul and Consul Enterprise’s (“Consul”) key/value endpoint is vulnerable to denial of service (DoS) due to incorrect Content Length header validation. This vulnerability, CVE-2025-11374, is fixed in Consul Community Edition 1.22.0 and Consul Enterprise 1.22.0, 1.21.6, 1.20.8 and 1.18.12.

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	0.4% (top 63%)
CISA exploited list	No
Weakness	CWE-770
Published	2025-10-28
Last modified	2026-10-18

Publisher (CNA): HashiCorp Inc. · Vendor: hashicorp

Last updated 2026-10-18 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-10-28 21:15 UTCPublished CVE record published
2026-10-18 21:10 UTCUpdated Record last modified

hashicorp consul UPGRADE

Affected: < 1.18.12 · < 1.22.0 · >= 1.19.0 and < 1.20.8 · >= 1.21.0 and < 1.21.6

Fixed in: 1.18.12, 1.20.8, 1.21.6, 1.22.0

Safe to downgrade to: a release before 1.19.0

1. Check installed version

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

2. UPGRADE to 1.18.12 (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 1.19.0 (Debian / Ubuntu)

apt-cache madison consul sudo apt install consul=<VERSION_BEFORE_1.19.0> 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_1.19.0> 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-2025-11374?

consul: upgrade to 1.18.12, 1.20.8, 1.21.6, 1.22.0. Exact commands for each OS are on this page.

Is CVE-2025-11374 being exploited?

CVE-2025-11374 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-2025-11374 affect?

CVE-2025-11374 affects consul. Severity is medium (CVSS 6.5). Consul and Consul Enterprise’s (“Consul”) key/value endpoint is vulnerable to denial of service (DoS) due to incorrect Content Length header validation. This vulnerability, CVE-2025-11374, is fixed in Consul Community Edition 1.22.0 and Con

How urgent is CVE-2025-11374?

Priority 32/100. No elevated risk signals yet.

Software pages

Consul vulnerabilities

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References

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