What is CVE-2021-27668?

CVE-2021-27668 is a medium-severity vulnerability in Hashicorp Vault, classified under Missing Authentication for Critical Function. CVSS score: 5.3/10. Published 2021-08-31.

How severe is CVE-2021-27668?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Is CVE-2021-27668 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Auth bypass in Hashicorp Vault

CVE-2021-27668

HashiCorp Vault Enterprise 0.9.2 through 1.6.2 allowed the read of license metadata from DR secondaries without authentication. Fixed in 1.6.3.

Vulnerability class: Broken Authentication

Published 2021-08-31 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.010 (62.7th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 62.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Hashicorp Vault

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

discuss.hashicorp.com/t/hcsec-2021-05-vault-enterprise-s-dr-secondaries-exposed… (Vendor Advisory)
security.gentoo.org/glsa/202207-01 (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2021-27668?: CVE-2021-27668 is a medium-severity vulnerability in Hashicorp Vault, classified under Missing Authentication for Critical Function. CVSS score: 5.3/10. Published 2021-08-31.
How severe is CVE-2021-27668?: Medium severity. CVSS v3 base score is 5.3 out of 10.
Is CVE-2021-27668 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.