CVE-2025-11375: consul DoS — Fix

Description

Consul and Consul Enterprise’s (“Consul”) event endpoint is vulnerable to denial of service (DoS) due to lack of maximum value on the Content Length header. This vulnerability, CVE-2025-11375, 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.

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CVSS v3.1 Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-770 CWE-770

Affected Products

Vendor	Product	Versions
hashicorp	consul	< 1.18.12
hashicorp	consul	< 1.22.0
hashicorp	consul	1.19.0 — 1.20.8
hashicorp	consul	1.21.0 — 1.21.6

References

Advisories & Patches

https://discuss.hashicorp.com/t/hcsec-2025-28-consuls-event-endpoint-is-vulnerable-to-denial-of-service/76723

Frequently Asked Questions

What is CVE-2025-11375? +

Consul and Consul Enterprise’s (“Consul”) event endpoint is vulnerable to denial of service (DoS) due to lack of maximum value on the Content Length header. This vulnerability, CVE-2025-11375, 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. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2025-11375? +

CVE-2025-11375 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-11375? +

CVE-2025-11375 affects products from hashicorp, specifically: consul. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-11375? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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