VDB-182108 · CVE-2021-40539 · GCVE-0-2021-40539

Zoho ManageEngine ADSelfService Plus up to 6113 REST API improper authentication

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
8.9	$0-$5k	0.00

Summaryinfo

A vulnerability labeled as critical has been found in Zoho ManageEngine ADSelfService Plus up to 6113. This vulnerability affects unknown code of the component REST API. Such manipulation leads to improper authentication. This vulnerability is listed as CVE-2021-40539. The attack may be performed from remote. In addition, an exploit is available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Zoho ManageEngine ADSelfService Plus up to 6113. Affected by this issue is an unknown part of the component REST API. The manipulation with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is confidentiality, integrity, and availability.

The weakness was presented 09/07/2021. The advisory is shared for download at manageengine.com. This vulnerability is handled as CVE-2021-40539. Technical details are unknown but a public exploit is available.

The exploit is available at packetstormsecurity.com. It is declared as attacked. This issue was added on 11/03/2021 to the CISA Known Exploited Vulnerabilities Catalog with a due date of 11/17/2021:

Apply updates per vendor instructions.

The vulnerability is also documented in the vulnerability database at Zero-Day.cz (661). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

Zoho ManageEngine

Name

ADSelfService Plus

Version

6113

License

commercial

Website

Vendor: https://www.manageengine.com/

CPE 2.3info

🔍

CPE 2.2info

🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.0
VulDB Meta Temp Score: 8.9

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CNA Base Score: 9.8
CNA Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Improper authentication
CWE: CWE-287
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Attacked
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

KEV Added: 🔍
KEV Due: 🔍
KEV Remediation: 🔍
KEV Ransomware: 🔍
KEV Notice: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Zero-Day.cz: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

09/06/2021 🔍
09/07/2021 +1 days 🔍
09/07/2021 +0 days 🔍
02/03/2025 +1245 days 🔍

Sourcesinfo

Vendor: manageengine.com

Advisory: manageengine.com
Status: Confirmed

CVE: CVE-2021-40539 (🔍)
GCVE (CVE): GCVE-0-2021-40539
GCVE (VulDB): GCVE-100-182108
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 09/07/2021 21:00
Updated: 02/03/2025 19:57
Changes: 09/07/2021 21:00 (54), 09/10/2021 09:39 (2), 02/18/2022 10:00 (5), 04/22/2024 07:05 (23), 06/25/2024 07:17 (2), 09/16/2024 14:18 (1), 02/03/2025 19:57 (28)
Complete: 🔍
Cache ID: 216::103