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Fencer Vulns
high 8.8

CVE-2021-37218 json

Privilege escalation in Hashicorp Nomad

published 2021-09-07 5 y ago modified 2026-06-17 4 mo ago also GHSA-c8x3-rg72-fwwg , GO-2022-0591 , EUVD-2021-2035

cvss
8.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 52%
public exploits
0
none known

Summary

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.

Patch / fix

  • go github.com/hashicorp/nomad 1.0.10, 1.1.4
  • hashicorp nomad 1.0.10, 1.1.4
  • nomad Alpine 3.15 1.1.12-r0
  • nomad Alpine 3.18, Alpine 3.17, Alpine 3.16 1.2.6-r0

alpine advisories ALPINE-CVE-2021-37218

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • nomad Arch Linux 1.1.4-1

arch linux advisories AVG-2359

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-37218 updated cvss 8.8

nomad: Raft RPC privilege escalation

  • Red Hat Advanced Cluster Management for Kubernetes 2 multicluster-engine, rhacm2/openshift-hive-rhel8, rhacm2/multiclusterhub-rhel8, rhacm2/multicloud-manager-rhel8, rhacm2/cluster-curator-controller-rhel8, rhacm2/clusterlifecycle-state-metrics-rhel8
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.67% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.5 AV:N/AC:L/Au:S/C:P/I:P/A:P
GitHub 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
go github.com/hashicorp/nomad
<1.0.10
>=1.1.0, <1.1.4
1.0.10
1.1.4

Classification

Weakness
  • CWE-295 Improper Certificate Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.