CVE-2021-36213 json
HashiCorp Consul L7 deny intention results in an allow action
published 2021-07-17 5 y ago modified 2026-09-10 1 mo ago also BIT-consul-2021-36213 , EUVD-2021-1451 , GHSA-8h2g-r292-j8xh , GO-2022-0895
- cvss
- 7.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.7%
- EPSS 1.7% chance of exploitation in 30 days, percentile 77%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- go github.com/hashicorp/consul 1.10.1
- bitnami consul 1.9.8, 1.10.1
- hashicorp consul 1.9.8, 1.10.1
- consul Arch Linux 1.9.8-1
arch linux advisories AVG-2171
Exploit prediction
1.69% chance of exploitation in the next 30 days, higher than 77% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:P/A:N |
| OSV | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/hashicorp/consul | <1.10.1 |
1.10.1 |
| bitnami | consul | >=1.9.0, <1.9.8 >=1.10.0, <1.10.1 |
1.9.8 1.10.1 |
References
-
security.gentoo.org
/glsa/202208-09
vendor-advisory, web, third-party-advisory, advisory
-
hashicorp.com
/blog/category/consul
web, product, vendor-advisory, advisory
-
discuss.hashicorp.com
/t/hcsec-2021-16-consul-s-application-aware-intentions-deny-action-fails-open-when-combined-with-default-deny-
web, vendor-advisory, advisory
-
github.com
/hashicorp/consul/releases/tag/v1.10.1
web, release-notes, third-party-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-36213
advisory, web
-
github.com
/hashicorp/consul
web
-
github.com
/advisories/GHSA-8h2g-r292-j8xh
advisory
Sources
- CVE List CVE-2021-36213
- GitHub Advisory GHSA-8h2g-r292-j8xh
- NVD CVE-2021-36213
- OSV BIT-consul-2021-36213
- OSV GO-2022-0895
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