CVE-2025-11375 Consul's event endpoint is vulnerable to denial of service

What is CVE-2025-11375?

CVE-2025-11375 is a medium-severity denial of service vulnerability in HashiCorp Consul, published on 28 Oct 2025. Any signed-in user can exploit it over the network, with no action from the victim.

Official 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.

Weakness: CWE-770

Which versions are affected by CVE-2025-11375?

4 open source packages ship an affected version, including github.com/hashicorp/consul and consul. It affects 1 product.

Products include Hashicorp Consul.

How do I fix CVE-2025-11375?

Upgrade github.com/hashicorp/consul to 1.22.0 or later.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2025-11375 being exploited?

There is no known exploitation of CVE-2025-11375 in the wild and no public exploit code.

Other vulnerabilities in HashiCorp Consul

• CVE-2021-41805 Privilege escalation in n/a High 8.8
• CVE-2021-37219 HashiCorp Consul Privilege Escalation Vulnerability High 8.8
• CVE-2023-2816 Consul Envoy Extension Downsteam Proxy Configuration By Upstream Service Owner High 8.7
• CVE-2024-10006 Consul L7 Intentions Vulnerable To Headers Bypass High 8.3
• CVE-2024-10005 Consul L7 Intentions Vulnerable To URL Path Bypass High 8.1

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-consul-2025-11375, CLEANSTART-2026-HZ65290, DEBIAN-CVE-2025-11375, GHSA-qh7p-pfq3-677h, GO-2025-4082, UBUNTU-CVE-2025-11375.