CVE-2021-44651 [High] | File Upload / RCE in Manageengine Cloud Securi…

CVE-2021-44651 is rated Moderate Risk (64.6/100): CVSS High severity, with high exploitation likelihood (EPSS 5.26%, 91th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. High exploitation likelihood—assess exposure and prioritize remediation.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	7.83%	5.26%	-2.57%
2	2025-03-30	18.71%	7.83%	-10.88%
3	2025-03-29	—	18.71%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

7.83%

5.26%

-2.57%

2025-03-30

18.71%

7.83%

-10.88%

2025-03-29

—

18.71%

—

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]
6.5	2.0	MEDIUM	`AV:N/AC:L/Au:S/C:P/I:P/A:P` 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:P) Partial confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:P) Partial availability impact.	8.0	6.4	[email protected]

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]

6.5

2.0

MEDIUM

AV:N/AC:L/Au:S/C:P/I:P/A:P 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:P): Partial confidentiality impact.
Integrity impact (I:P): Partial integrity impact.
Availability impact (A:P): Partial availability impact.

8.0

6.4

[email protected]

Affected software / configurations for CVE-2021-44651

Vendor	Product	Version	Raw CPE
zohocorp	manageengine_cloud_security_plus	< 4.1	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:-::::::
zohocorp	manageengine_cloud_security_plus	4.1	cpe:2.3:a:zohocorp:manageengine_cloud_security_plus:4.1:build4110::::::
zohocorp	manageengine_cloud_security_plus	4.1	cpe:2.3:a:zohocorp:manageengine_cloud_security_plus:4.1:build4111::::::
zohocorp	manageengine_cloud_security_plus	4.1	cpe:2.3:a:zohocorp:manageengine_cloud_security_plus:4.1:build4112::::::
zohocorp	manageengine_cloud_security_plus	4.1	cpe:2.3:a:zohocorp:manageengine_cloud_security_plus:4.1:build4113::::::
zohocorp	manageengine_cloud_security_plus	4.1	cpe:2.3:a:zohocorp:manageengine_cloud_security_plus:4.1:build4115::::::
zohocorp	manageengine_cloud_security_plus	4.1	cpe:2.3:a:zohocorp:manageengine_cloud_security_plus:4.1:build4116::::::
zohocorp	log360	<= 5.2.2	cpe:2.3:a:zohocorp:log360::::::::
zohocorp	manageengine_cloud_security_plus	<= 4.1.1.7	cpe:2.3:a:zohocorp:manageengine_cloud_security_plus::::::::

References for CVE-2021-44651

URL	Tags
https://sahildhar.github.io/blogpost/Zoho-ManageEngine-CloudSecurityPlus-Remote-Code-Execution-via-Security-Misconfiguration/	Vendor Advisory

URL

CVE-2021-44651

Exploit prediction scoring system (EPSS) score for CVE-2021-44651

Common vulnerability scoring system (CVSS) metrics for CVE-2021-44651

Weakness enumeration for CVE-2021-44651

Affected software / configurations for CVE-2021-44651

References for CVE-2021-44651