Security readout for executives and security teams
Plain-English summary
This issue let a trusted non-server Nomad agent reach functionality intended only for Nomad servers. An attacker would need a valid certificate from the same CA, so this is not described as unauthenticated internet exposure. The business risk is privilege escalation inside a Nomad cluster. HashiCorp fixed it in Nomad 1.0.10 and 1.1.4.
Executive priority
Prioritize remediation for production Nomad clusters because the issue affects the control-plane trust boundary. Treat it as high urgency where client agents or their certificates may be accessible to less-trusted operators or workloads.
Technical view
CVE-2021-37218 affects HashiCorp Nomad and Nomad Enterprise Raft RPC authorization. The Raft RPC layer allowed non-server agents with a certificate signed by the same CA to access server-only functionality, enabling privilege escalation. The source bundle lists fixes in versions 1.0.10 and 1.1.4, but provides no CVSS, CWE, or detailed affected range.
Likely exposure
Exposure is most likely in Nomad or Nomad Enterprise clusters running versions before the listed fixes, especially where non-server agents hold certificates signed by the same CA trusted by servers. Evidence does not show unauthenticated exposure.
Exploitation context
The source bundle does not report active exploitation, and KEV is false. Exploitation requires at least possession of a valid same-CA certificate by a non-server agent, indicating an authenticated cluster-internal privilege escalation scenario.
Researcher notes
The available evidence is concise: no CVSS, CWE, exploit details, or full affected-version matrix are included. Anchor assessment on the HashiCorp advisory and CVE record. Avoid exploit validation; use version checks and certificate-trust review.
Mitigation direction
- Upgrade Nomad and Nomad Enterprise to 1.0.10, 1.1.4, or later supported releases.
- Review HashiCorp advisory guidance for exact affected versions and upgrade sequencing.
- Restrict issuance and storage of Nomad agent certificates.
- Audit whether non-server agents use certificates signed by the same trusted CA.
Validation and detection
- Inventory all Nomad and Nomad Enterprise cluster versions.
- Confirm clusters are running 1.0.10, 1.1.4, or later.
- Review agent certificate issuance and CA trust relationships.
- Check vendor advisory for any environment-specific validation guidance.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
Privilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-37218 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://www.hashicorp.com/blog/category/nomadCVE reference · x_refsource_MISC
- https://discuss.hashicorp.com/t/hcsec-2021-21-nomad-raft-rpc-privilege-escalation/29023CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.