How severe is CVE-2021-41803?

CVE-2021-41803 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability high.

Is CVE-2021-41803 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-41803?

CVE-2021-41803 primarily affects Hashicorp Consul. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-41803?

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-2021-41803 published?

CVE-2021-41803 was published on 2022-09-23 and last updated on 2026-06-17.

CVE-2021-41803

CVE-2021-41803 is a high-severity vulnerability in Hashicorp Consul with a CVSS 3.x base score of 7.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-862.

Key facts

Severity: High (CVSS 3.x base score 7.1)
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-862
Affected product: Hashicorp Consul
Published: 2022-09-23
Last modified: 2026-06-17

Description

HashiCorp Consul 1.8.1 up to 1.11.8, 1.12.4, and 1.13.1 do not properly validate the node or segment names prior to interpolation and usage in JWT claim assertions with the auto config RPC. Fixed in 1.11.9, 1.12.5, and 1.13.2."

Frequently asked questions

What is CVE-2021-41803?: HashiCorp Consul 1.8.1 up to 1.11.8, 1.12.4, and 1.13.1 do not properly validate the node or segment names prior to interpolation and usage in JWT claim assertions with the auto config RPC. Fixed in 1.11.9, 1.12.5, and 1.13.2."
How severe is CVE-2021-41803?: CVE-2021-41803 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability high.
Is CVE-2021-41803 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-41803?: CVE-2021-41803 primarily affects Hashicorp Consul. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-41803?: 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-2021-41803 published?: CVE-2021-41803 was published on 2022-09-23 and last updated on 2026-06-17.

References

Affected products (6)

cpe:2.3:a:hashicorp:consul:*:*:*:*:-:*:*:*
cpe:2.3:a:hashicorp:consul:*:*:*:*:enterprise:*:*:*
cpe:2.3:a:hashicorp:consul:1.12.4:*:*:*:-:*:*:*
cpe:2.3:a:hashicorp:consul:1.12.4:*:*:*:enterprise:*:*:*
cpe:2.3:a:hashicorp:consul:1.13.1:*:*:*:-:*:*:*
cpe:2.3:a:hashicorp:consul:1.13.1:*:*:*:enterprise:*:*:*

More vulnerabilities in Hashicorp Consul

CVE-2021-41805 — High (CVSS 8.8): 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.…
CVE-2021-37219 — High (CVSS 8.8): HashiCorp Consul and Consul Enterprise 1.10.1 Raft RPC layer allows non-server agents with a valid certificate signed…
CVE-2023-2816 — High (CVSS 8.7): Consul and Consul Enterprise allowed any user with service:write permissions to use Envoy extensions configured via…
CVE-2021-3121 — High (CVSS 8.6): An issue was discovered in GoGo Protobuf before 1.3.2. plugin/unmarshal/unmarshal.go lacks certain index validation,…
CVE-2024-10006 — High (CVSS 8.3): A vulnerability was identified in Consul and Consul Enterprise (“Consul”) such that using Headers in L7 traffic…
CVE-2024-10005 — High (CVSS 8.1): A vulnerability was identified in Consul and Consul Enterprise (“Consul”) such that using URL paths in L7 traffic…

All CVEs affecting Hashicorp Consul →

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