Moodle up to 3.5.16/3.8.7/3.9.4/3.10.1 Web Service authorization

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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3.8$0-$5k0.00

Summaryinfo

A vulnerability categorized as critical has been discovered in Moodle up to 3.5.16/3.8.7/3.9.4/3.10.1. This vulnerability affects unknown code of the component Web Service. Such manipulation leads to authorization. This vulnerability is traded as CVE-2021-20283. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Moodle up to 3.5.16/3.8.7/3.9.4/3.10.1 (Learning Management Software) and classified as problematic. Affected by this issue is an unknown functionality of the component Web Service. The manipulation with an unknown input leads to a authorization vulnerability. Using CWE to declare the problem leads to CWE-863. The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions. Impacted is confidentiality.

The weakness was shared 03/16/2021. The advisory is shared for download at bugzilla.redhat.com. This vulnerability is handled as CVE-2021-20283. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 261351 (Linux Distros Unpatched Vulnerability : CVE-2021-20283), 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 (261351). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.9
VulDB Meta Temp Score: 3.8

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

NVD Base Score: 4.3
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: Authorization
CWE: CWE-863 / CWE-285 / 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: 261351
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2021-20283

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-2021-20283 (🔍)
GCVE (CVE): GCVE-0-2021-20283
GCVE (VulDB): GCVE-100-171284

Entryinfo

Created: 03/16/2021 10:31
Updated: 09/08/2025 19:08
Changes: 03/16/2021 10:31 (39), 04/01/2021 16:37 (5), 04/01/2021 16:40 (18), 09/08/2025 19:08 (17)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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