CVE-2023-1297: Consul Cluster Peering can Result in Denial of Service

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-06-02 · updated 2026-06-17
Weakness: CWE-826

Description

Consul and Consul Enterprise's cluster peering implementation contained a flaw whereby a peer cluster with service of the same name as a local service could corrupt Consul state, resulting in denial of service. This vulnerability was resolved in Consul 1.14.5, and 1.15.3

Affected products

HashiCorp Consul: from 1.13.0 before 1.14.7; from 1.15.0 before 1.15.3 — fixed in 1.14.7, 1.15.3

How to fix

Upgrade to a fixed version: HashiCorp Consul 1.14.7, 1.15.3. Check the vendor advisory for mitigations.

References

https://discuss.hashicorp.com/t/hcsec-2023-15-consul-cluster-peering-can-result-in-denial-of-service/54515
https://discuss.hashicorp.com/t/hcsec-2023-15-consul-cluster-peering-can-result-in-denial-of-service/54515

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