What’s Vulnerable › Vulnerabilities

CVE-2021-28156

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-04-20 · updated 2026-06-17

Description

HashiCorp Consul Enterprise version 1.8.0 up to 1.9.4 audit log can be bypassed by specifically crafted HTTP events. Fixed in 1.9.5, and 1.8.10.

Affected products

• HashiCorp Consul: from 1.8.0 before 1.8.10; from 1.9.0 before 1.9.5 — fixed in 1.8.10, 1.9.5

How to fix

Upgrade to a fixed version: HashiCorp Consul 1.8.10, 1.9.5. Check the vendor advisory for mitigations.

References

• https://discuss.hashicorp.com/t/hcsec-2021-08-consul-enterprise-audit-log-bypass-for-http-events/23369
• https://security.gentoo.org/glsa/202208-09
• https://www.hashicorp.com/blog/category/consul
• https://discuss.hashicorp.com/t/hcsec-2021-08-consul-enterprise-audit-log-bypass-for-http-events/23369
• https://security.gentoo.org/glsa/202208-09
• https://www.hashicorp.com/blog/category/consul

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