What is CVE-2020-10661?

CVE-2020-10661 is a critical-severity vulnerability in Hashicorp Vault. CVSS score: 9.1/10. Published 2020-03-23.

How severe is CVE-2020-10661?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in Hashicorp Vault

CVE-2020-10661

HashiCorp Vault and Vault Enterprise versions 0.11.0 through 1.3.3 may, under certain circumstances, have existing nested-path policies grant access to Namespaces created after-the-fact. Fixed in 1.3.4.

Published 2020-03-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.011 (64.7th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 64.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Hashicorp Vault

References

www.hashicorp.com/blog/category/vault/ (Vendor Advisory)
github.com/hashicorp/vault/blob/master/CHANGELOG.md (Third Party Advisory)

Frequently asked questions

What is CVE-2020-10661?: CVE-2020-10661 is a critical-severity vulnerability in Hashicorp Vault. CVSS score: 9.1/10. Published 2020-03-23.
How severe is CVE-2020-10661?: Critical severity. CVSS v3 base score is 9.1 out of 10.