What is CVE-2018-19653?

CVE-2018-19653 is a medium-severity vulnerability in Hashicorp Consul, classified under Cryptographic Issues. CVSS score: 5.9/10. Published 2018-12-09.

How severe is CVE-2018-19653?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Hashicorp Consul

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.

Vulnerability class: POODLE (CVE-2014-3566)

Published 2018-12-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.012 (67.6th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 68th percentile — 67.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Hashicorp Consul

Weakness classification (CWE)

CWE-310 — Cryptographic Issues

References

groups.google.com/forum/
github.com/hashicorp/consul/pull/5069 (Patch, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2018-19653?: CVE-2018-19653 is a medium-severity vulnerability in Hashicorp Consul, classified under Cryptographic Issues. CVSS score: 5.9/10. Published 2018-12-09.
How severe is CVE-2018-19653?: Medium severity. CVSS v3 base score is 5.9 out of 10.