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."

Published: 2022-09-22 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-41803 is rated Moderate Risk (47.3/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.82%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-41803

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.27% 0.82% +0.55%
2 2025-11-21 0.73% 0.27% -0.46%
3 2025-11-18 — 0.73% —

Full EPSS history (12 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-41803

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.1 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 4.2 [email protected]
7.1 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 4.2 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2021-41803

GitHub Security Advisory for CVE-2021-41803

GHSA-hr3v-8cp3-68rf · Severity: high · Ecosystem: go — HashiCorp Consul does not properly validate node or segment names prior to usage in JWT claim assertions

OS Trackers for CVE-2021-41803

vendor priority summary link
alpine — CVE-2021-41803: 1 source package rows (consul); 6 state rows across 3 repos (3.17-community, 3.18-community, edge-community); fixed 3, open 3. https://security.alpinelinux.org/vuln/CVE-2021-41803
debian not yet assigned CVE-2021-41803 not yet assigned priority: Debian including 1 source packages (consul), 1 status rows across 1 suites (bullseye): open 1. https://security-tracker.debian.org/tracker/CVE-2021-41803
redhat medium — https://access.redhat.com/security/cve/CVE-2021-41803
ubuntu medium CVE-2021-41803 medium priority: Ubuntu including 1 source packages (consul), 13 status rows across 13 suites (bionic, focal, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 5, ignored 4, needs-triage 4. https://ubuntu.com/security/CVE-2021-41803

Affected software / configurations for CVE-2021-41803

Vendor Product Version Raw CPE
hashicorp consul >= 1.8.1, < 1.11.9 cpe:2.3:a:hashicorp:consul:*:*:*:*:-:*:*:*
hashicorp consul >= 1.8.1, < 1.11.9 cpe:2.3:a:hashicorp:consul:*:*:*:*:enterprise:*:*:*
hashicorp consul 1.12.4 cpe:2.3:a:hashicorp:consul:1.12.4:*:*:*:-:*:*:*
hashicorp consul 1.12.4 cpe:2.3:a:hashicorp:consul:1.12.4:*:*:*:enterprise:*:*:*
hashicorp consul 1.13.1 cpe:2.3:a:hashicorp:consul:1.13.1:*:*:*:-:*:*:*
hashicorp consul 1.13.1 cpe:2.3:a:hashicorp:consul:1.13.1:*:*:*:enterprise:*:*:*

References for CVE-2021-41803

cvelogic Threat Intelligence