How severe is CVE-2021-41805?

CVE-2021-41805 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-41805 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 35% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-41805?

CVE-2021-41805 affects Hashicorp Consul. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-41805?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-41805 published?

CVE-2021-41805 was published on 2021-12-12 and last updated on 2026-06-17.

CVE-2021-41805

CVE-2021-41805 is a high-severity vulnerability in Hashicorp Consul with a CVSS 3.x base score of 8.8. Its EPSS exploit-prediction score of 35% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-863.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.5
EPSS exploit prediction: 35% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-863
Affected product: Hashicorp Consul
Published: 2021-12-12
Last modified: 2026-06-17

Description

HashiCorp Consul Enterprise before 1.8.17, 1.9.x before 1.9.11, and 1.10.x before 1.10.4 has Incorrect Access Control. An ACL token (with the default operator:write permissions) in one namespace can be used for unintended privilege escalation in a different namespace.

Frequently asked questions

What is CVE-2021-41805?: HashiCorp Consul Enterprise before 1.8.17, 1.9.x before 1.9.11, and 1.10.x before 1.10.4 has Incorrect Access Control. An ACL token (with the default operator:write permissions) in one namespace can be used for unintended privilege escalation in a different namespace.
How severe is CVE-2021-41805?: CVE-2021-41805 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-41805 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 35% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-41805?: CVE-2021-41805 affects Hashicorp Consul. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-41805?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-41805 published?: CVE-2021-41805 was published on 2021-12-12 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:hashicorp:consul:*:*:*:*:enterprise:*:*:*

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