CVE-2021-41805

HIGH

HashiCorp Consul Enterprise < 1.8.17, 1.9.x < 1.9.11, 1.10.x < 1.10.4 - Incorrect Access Control via Namespace ACL Token

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 2 public exploits for CVE-2021-41805. PoCs published by blackm4c, acfirthh.

AI-analyzed exploit summary This exploit leverages CVE-2021-41805, an incorrect access control vulnerability in HashiCorp Consul Enterprise, to achieve remote code execution by registering a malicious service with a reverse shell payload. The exploit uses an ACL token with default operator:write permissions to escalate privileges across namespaces.

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.

Exploits (2)

nomisec WORKING POC 1 stars
by blackm4c · poc
https://github.com/blackm4c/CVE-2021-41805

This exploit leverages CVE-2021-41805, an incorrect access control vulnerability in HashiCorp Consul Enterprise, to achieve remote code execution by registering a malicious service with a reverse shell payload. The exploit uses an ACL token with default operator:write permissions to escalate privileges across namespaces.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Trivial
Reliability
Reliable
Target: HashiCorp Consul Enterprise before 1.8.17, 1.9.x before 1.9.11, and 1.10.x before 1.10.4
Auth required
Prerequisites: ACL token with operator:write permissions · Network access to the Consul API
devstral-2 · analyzed Feb 16, 2026 Full analysis →
nomisec WORKING POC
by acfirthh · poc
https://github.com/acfirthh/CVE-2021-41805

This is a functional exploit for CVE-2021-41805, targeting HashiCorp Consul Enterprise. It leverages an ACL token with operator:write permissions to achieve remote code execution via a reverse shell payload.

Classification
Working Poc 100%
Attack Type
Rce
Complexity
Trivial
Reliability
Reliable
Target: HashiCorp Consul Enterprise < 1.8.17, 1.9.x < 1.9.11, 1.10.x < 1.10.4
Auth required
Prerequisites: ACL token with operator:write permissions · Network access to the Consul API
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (3)

Core 3

Scores

CVSS v3 8.8
EPSS 0.3479
EPSS Percentile 98.2%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Details

CWE
CWE-863
Status published
Products (1)
hashicorp/consul 1.7.0 - 1.8.17
Published Dec 12, 2021
Tracked Since Feb 18, 2026