How severe is CVE-2018-19653?

CVE-2018-19653 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2018-19653 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-19653?

CVE-2018-19653 affects Hashicorp Consul. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-19653?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2018-19653 published?

CVE-2018-19653 was published on 2018-12-09 and last updated on 2026-06-17.

CVE-2018-19653

CVE-2018-19653 is a medium-severity vulnerability in Hashicorp Consul with a CVSS 3.x base score of 5.9. 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-310.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
CVSS v2: 4.3
EPSS exploit prediction: 1% (65th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-310
Affected product: Hashicorp Consul
Published: 2018-12-09
Last modified: 2026-06-17

Description

HashiCorp Consul 0.5.1 through 1.4.0 can use cleartext agent-to-agent RPC communication because the verify_outgoing setting is improperly documented. NOTE: the vendor has provided reconfiguration steps that do not require a software upgrade.

Frequently asked questions

What is CVE-2018-19653?: HashiCorp Consul 0.5.1 through 1.4.0 can use cleartext agent-to-agent RPC communication because the verify_outgoing setting is improperly documented. NOTE: the vendor has provided reconfiguration steps that do not require a software upgrade.
How severe is CVE-2018-19653?: CVE-2018-19653 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2018-19653 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-19653?: CVE-2018-19653 affects Hashicorp Consul. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-19653?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-19653 published?: CVE-2018-19653 was published on 2018-12-09 and last updated on 2026-06-17.

References

Affected products (1)

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

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