CVE-2021-32756 | Arbitrary eval through MiqExpression

ManageIQ is an open-source management platform. In versions prior to jansa-4, kasparov-2, and lasker-1, there is a flaw in the MiqExpression module of ManageIQ where a low privilege user could enter a crafted Ruby string which would be evaluated. Successful exploitation will allow an attacker to execute arbitrary code with root privileges on the host system. There are patches for this issue in releases named jansa-4, kasparov-2, and lasker-1. If possible, restrict users, via RBAC, to only the part of the application that they need access to. While MiqExpression is widely used throughout the product, restricting users can limit the surface of the attack.

Published: 2021-07-21 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-32756 is rated Moderate Risk (60.7/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.54%). 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-2021-32756

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 1.02% 1.54% +0.51%
2 2025-07-13 0.40% 1.02% +0.63%
3 2025-03-30 — 0.40% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-32756

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.8 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]
8.8 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]
9.0 2.0 HIGH
AV:N/AC:L/Au:S/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 8.0 10.0 [email protected]

Weakness enumeration for CVE-2021-32756

Affected software / configurations for CVE-2021-32756

Vendor Product Version Raw CPE
manageiq manageiq jansa-1 cpe:2.3:a:manageiq:manageiq:jansa-1:-:*:*:*:*:*:*
manageiq manageiq jansa-1 cpe:2.3:a:manageiq:manageiq:jansa-1:alpha1:*:*:*:*:*:*
manageiq manageiq jansa-1 cpe:2.3:a:manageiq:manageiq:jansa-1:beta1:*:*:*:*:*:*
manageiq manageiq jansa-1 cpe:2.3:a:manageiq:manageiq:jansa-1:rc1:*:*:*:*:*:*
manageiq manageiq jansa-1 cpe:2.3:a:manageiq:manageiq:jansa-1:rc2:*:*:*:*:*:*
manageiq manageiq jansa-2 cpe:2.3:a:manageiq:manageiq:jansa-2:*:*:*:*:*:*:*
manageiq manageiq jansa-3 cpe:2.3:a:manageiq:manageiq:jansa-3:*:*:*:*:*:*:*
manageiq manageiq kasparov-1 cpe:2.3:a:manageiq:manageiq:kasparov-1:-:*:*:*:*:*:*
manageiq manageiq kasparov-1 cpe:2.3:a:manageiq:manageiq:kasparov-1:alpha1:*:*:*:*:*:*
manageiq manageiq kasparov-1 cpe:2.3:a:manageiq:manageiq:kasparov-1:beta1:*:*:*:*:*:*
manageiq manageiq kasparov-1 cpe:2.3:a:manageiq:manageiq:kasparov-1:beta1.1:*:*:*:*:*:*
manageiq manageiq lasker-1 cpe:2.3:a:manageiq:manageiq:lasker-1:beta1:*:*:*:*:*:*

References for CVE-2021-32756

cvelogic Threat Intelligence