No exploitation reportedFix available

CVE-2021-36213

Q: Is CVE-2021-36213 actively exploited?

Active exploitation of CVE-2021-36213 has not been confirmed. Its EPSS score was 1.7% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-36213?

CVE-2021-36213 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

No exploitation reported by the sources we read.

Published2021-07-17
Fixed in1.10.1 · 1.9.8

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

HashiCorp Consul and Consul Enterprise 1.9.0 through 1.10.0 default deny policy with a single L7 application-aware intention deny action cancels out, causing the intention to incorrectly fail open, allowing L4 traffic. Fixed in 1.9.8 and 1.10.1.

Timeline

dates in UTC

2021-07-1718:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-36213?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-36213?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Hashicorp consul

Branch	Affected	Fixed in	Source
1.10	≥ 1.10.0, < 1.10.1	1.10.1	NVD
1.9	≥ 1.9.0, < 1.9.8	1.9.8	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Hashicorp consul to 1.10.1 · 1.9.8

Advisories and patches

discuss.hashicorp.comVendor Advisory
github.comRelease Notes
www.hashicorp.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.17.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
FIRST EPSSEPSS score1.7 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Published: 2021-07-17
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-36213?

Is CVE-2021-36213 actively exploited?

Active exploitation of CVE-2021-36213 has not been confirmed. Its EPSS score was 1.7% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-36213?

CVE-2021-36213 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

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