CVE-2021-40173

Zoho ManageEngine Cloud Security Plus before Build 4117 allows a CSRF attack on the server proxy settings.

Published: 2021-08-29 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-40173 is rated Moderate Risk (55.5/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.96%). 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-2021-40173

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 0.57% 0.96% +0.39%
2 2025-11-21 0.68% 0.57% -0.10%
3 2025-11-18 — 0.68% —

Full EPSS history (11 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-40173

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:N/UI:R/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:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
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]
6.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 6.4 [email protected]

Weakness enumeration for CVE-2021-40173

Affected software / configurations for CVE-2021-40173

Vendor Product Version Raw CPE
zohocorp manageengine_cloud_security_plus <= 4.0 cpe:2.3:a:zohocorp:manageengine_cloud_security_plus:*:*:*:*:*:*:*:*
zohocorp manageengine_cloud_security_plus 4.1 cpe:2.3:a:zohocorp:manageengine_cloud_security_plus:4.1:4100:*:*:*:*:*:*
zohocorp manageengine_cloud_security_plus 4.1 cpe:2.3:a:zohocorp:manageengine_cloud_security_plus:4.1:4101:*:*:*:*:*:*
zohocorp manageengine_cloud_security_plus 4.1 cpe:2.3:a:zohocorp:manageengine_cloud_security_plus:4.1:4102:*:*:*:*:*:*
zohocorp manageengine_cloud_security_plus 4.1 cpe:2.3:a:zohocorp:manageengine_cloud_security_plus:4.1:4103:*:*:*:*:*:*
zohocorp manageengine_cloud_security_plus 4.1 cpe:2.3:a:zohocorp:manageengine_cloud_security_plus:4.1:4104:*:*:*:*:*:*
zohocorp manageengine_cloud_security_plus 4.1 cpe:2.3:a:zohocorp:manageengine_cloud_security_plus:4.1:4105:*:*:*:*:*:*
zohocorp manageengine_cloud_security_plus 4.1 cpe:2.3:a:zohocorp:manageengine_cloud_security_plus:4.1:4106:*:*:*:*:*:*
zohocorp manageengine_cloud_security_plus 4.1 cpe:2.3:a:zohocorp:manageengine_cloud_security_plus:4.1:4107:*:*:*:*:*:*
zohocorp manageengine_cloud_security_plus 4.1 cpe:2.3:a:zohocorp:manageengine_cloud_security_plus:4.1:4108:*:*:*:*:*:*
zohocorp manageengine_cloud_security_plus 4.1 cpe:2.3:a:zohocorp:manageengine_cloud_security_plus:4.1:4109:*:*:*:*:*:*
zohocorp manageengine_cloud_security_plus 4.1 cpe:2.3:a:zohocorp:manageengine_cloud_security_plus:4.1:4110:*:*:*:*:*:*
zohocorp manageengine_cloud_security_plus 4.1 cpe:2.3:a:zohocorp:manageengine_cloud_security_plus:4.1:4111:*:*:*:*:*:*
zohocorp manageengine_cloud_security_plus 4.1 cpe:2.3:a:zohocorp:manageengine_cloud_security_plus:4.1:4112:*:*:*:*:*:*
zohocorp manageengine_cloud_security_plus 4.1 cpe:2.3:a:zohocorp:manageengine_cloud_security_plus:4.1:4113:*:*:*:*:*:*
zohocorp manageengine_cloud_security_plus 4.1 cpe:2.3:a:zohocorp:manageengine_cloud_security_plus:4.1:4115:*:*:*:*:*:*
zohocorp manageengine_cloud_security_plus 4.1 cpe:2.3:a:zohocorp:manageengine_cloud_security_plus:4.1:4116:*:*:*:*:*:*

References for CVE-2021-40173

cvelogic Threat Intelligence