What is CVE-2021-37218?

CVE-2021-37218 is a high-severity vulnerability in Hashicorp Nomad, classified under Improper Certificate Validation. CVSS score: 8.8/10. Published 2021-09-07.

How severe is CVE-2021-37218?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Hashicorp Nomad

CVE-2021-37218

HashiCorp Nomad and Nomad Enterprise Raft RPC layer allows non-server agents with a valid certificate signed by the same CA to access server-only functionality, enabling privilege escalation. Fixed in 1.0.10 and 1.1.4.

Vulnerability class: Improper Certificate Validation

Published 2021-09-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.007 (50.8th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 50.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Hashicorp Nomad

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

www.hashicorp.com/blog/category/nomad (Product, Vendor Advisory)
discuss.hashicorp.com/t/hcsec-2021-21-nomad-raft-rpc-privilege-escalation/29023 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-37218?: CVE-2021-37218 is a high-severity vulnerability in Hashicorp Nomad, classified under Improper Certificate Validation. CVSS score: 8.8/10. Published 2021-09-07.
How severe is CVE-2021-37218?: High severity. CVSS v3 base score is 8.8 out of 10.