How severe is CVE-2019-9764?

CVE-2019-9764 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2019-9764 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-9764?

CVE-2019-9764 affects Hashicorp Consul. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-9764?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2019-9764 published?

CVE-2019-9764 was published on 2019-03-26 and last updated on 2026-06-17.

CVE-2019-9764

CVE-2019-9764 is a high-severity vulnerability in Hashicorp Consul with a CVSS 3.x base score of 7.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-346.

Key facts

Severity: High (CVSS 3.x base score 7.4)
CVSS v2: 5.8
EPSS exploit prediction: 1% (45th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-346
Affected product: Hashicorp Consul
Published: 2019-03-26
Last modified: 2026-06-17

Description

HashiCorp Consul 1.4.3 lacks server hostname verification for agent-to-agent TLS communication. In other words, the product behaves as if verify_server_hostname were set to false, even when it is actually set to true. This is fixed in 1.4.4.

Frequently asked questions

What is CVE-2019-9764?: HashiCorp Consul 1.4.3 lacks server hostname verification for agent-to-agent TLS communication. In other words, the product behaves as if verify_server_hostname were set to false, even when it is actually set to true. This is fixed in 1.4.4.
How severe is CVE-2019-9764?: CVE-2019-9764 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2019-9764 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-9764?: CVE-2019-9764 affects Hashicorp Consul. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-9764?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2019-9764 published?: CVE-2019-9764 was published on 2019-03-26 and last updated on 2026-06-17.

References

https://github.com/hashicorp/consul/issues/5519

Affected products (1)

cpe:2.3:a:hashicorp:consul:1.4.3:*:*:*:*:*:*:*

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