What is CVE-2020-35453?

CVE-2020-35453 is a medium-severity vulnerability in Hashicorp Vault. CVSS score: 5.3/10. Published 2020-12-17.

How severe is CVE-2020-35453?

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

Is CVE-2020-35453 known to be exploited?

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

Vulnerability in Hashicorp Vault

CVE-2020-35453

HashiCorp Vault Enterprise’s Sentinel EGP policy feature incorrectly allowed requests to be processed in parent and sibling namespaces. Fixed in 1.5.6 and 1.6.1.

Published 2020-12-17 · 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:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.008 (55.7th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 55.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: +0.000

Affected products

Hashicorp Vault

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

github.com/hashicorp/vault/blob/master/CHANGELOG.md (Release Notes)
discuss.hashicorp.com/t/hcsec-2020-24-vault-enterprise-s-sentinel-egp-policies-… (Vendor Advisory)

Frequently asked questions

What is CVE-2020-35453?: CVE-2020-35453 is a medium-severity vulnerability in Hashicorp Vault. CVSS score: 5.3/10. Published 2020-12-17.
How severe is CVE-2020-35453?: Medium severity. CVSS v3 base score is 5.3 out of 10.
Is CVE-2020-35453 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.