Public proof of conceptFix available

CVE-2021-41805

Q: Is CVE-2021-41805 actively exploited?

Active exploitation of CVE-2021-41805 has not been confirmed. Its EPSS score was 34.8% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-41805?

CVE-2021-41805 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

A public proof of concept exists; no exploitation attested.

Published2021-12-12
Fixed in1.10.4 · 1.9.11 · 1.8.17
WeaknessCWE-863

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC

2021-12-1205:15CVE publishedNVD
2026-10-2319:23First public proof of conceptPoC-in-GitHub
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-41805?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-41805?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV

Hashicorp consul

Branch	Affected	Fixed in	Source
1.10	≥ 1.10.0, < 1.10.4	1.10.4	NVD · OSV
1.9	≥ 1.9.0, < 1.9.11	1.9.11	NVD · OSV
1.x	≥ 1.7.0, < 1.8.17	1.8.17	NVD · OSV

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Hashicorp consul to 1.10.4 · 1.9.11 · 1.8.17

Advisories and patches

discuss.hashicorp.comVendor Advisory
www.hashicorp.comVendor Advisory

Detection

read 2026-10-23 19:23 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 2 repositories, unverifiedblackm4c/CVE-2021-41805acfirthh/CVE-2021-41805

Sources

NVDCVSS 3.18.8read 2026-10-23
NVDCVSS 2.06.5read 2026-10-23
NVDweakness (CWE)CWE-863read 2026-10-23
FIRST EPSSEPSS score34.8 %read 2026-10-23
PoC-in-GitHubproof of concept2read 2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published: 2021-12-12
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-41805?

Is CVE-2021-41805 actively exploited?

Active exploitation of CVE-2021-41805 has not been confirmed. Its EPSS score was 34.8% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-41805?

CVE-2021-41805 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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