Moodle up to 3.5.16/3.8.7/3.9.4/3.10.1 Online Users Block information disclosure

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 (≈)
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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.
4.3$0-$5k0.00

Summaryinfo

A vulnerability was found in Moodle up to 3.5.16/3.8.7/3.9.4/3.10.1. It has been declared as problematic. Affected by this issue is some unknown functionality of the component Online Users Block. The manipulation results in information disclosure. This vulnerability is reported as CVE-2021-20281. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Moodle up to 3.5.16/3.8.7/3.9.4/3.10.1 (Learning Management Software). Affected is some unknown processing of the component Online Users Block. The manipulation with an unknown input leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality.

The weakness was disclosed 03/16/2021. The advisory is available at bugzilla.redhat.com. This vulnerability is traded as CVE-2021-20281. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1592 by the MITRE ATT&CK project.

The vulnerability scanner Nessus provides a plugin with the ID 261366 (Linux Distros Unpatched Vulnerability : CVE-2021-20281), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 3.5.17, 3.8.8, 3.9.5 or 3.10.2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (261366). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.3

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.3
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 261366
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2021-20281

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Moodle 3.5.17/3.8.8/3.9.5/3.10.2

Timelineinfo

12/17/2020 🔍
03/16/2021 +89 days 🔍
03/16/2021 +0 days 🔍
09/08/2025 +1637 days 🔍

Sourcesinfo

Product: moodle.org

Advisory: bugzilla.redhat.com
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2021-20281 (🔍)
GCVE (CVE): GCVE-0-2021-20281
GCVE (VulDB): GCVE-100-171282

Entryinfo

Created: 03/16/2021 10:29
Updated: 09/08/2025 14:31
Changes: 03/16/2021 10:29 (39), 04/01/2021 16:17 (5), 04/01/2021 16:21 (18), 09/08/2025 14:31 (17)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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