9.8

CVE-2021-3943: moodle Improper Input Validation

CVSS: 9.8v3.1CriticalModified
AliasesUBUNTU-CVE-2021-3943
Published 22-11-2021Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2021-3943 is a critical (CVSS 9.8) Improper Input Validation vulnerability in moodle. EPSS estimates a 2.40% chance of exploitation in the next 30 days, higher than 83.8% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
2.40%
0%100%
Low · -0.07 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 22-11-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

A flaw was found in Moodle in versions 3.11 to 3.11.3, 3.10 to 3.10.7, 3.9 to 3.9.10 and earlier unsupported versions. A remote code execution risk when restoring backup files was identified.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

2.40%

Chance of exploitation in the next 30 days

Percentile

84%

Versus all other CVEs

30-day change

-0.07 pp

From 2.46% on 21-09-2026

21-09-202621-10-2026
EPSS score
2.40%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Moodle1 product
  • moodle≥ 3.9.0, ≤ 3.9.10 | ≥ 3.10.0, ≤ 3.10.7 | ≥ 3.11.0, ≤ 3.11.3
Ubuntu1 product
  • moodleAll versions (No fix recorded)

2 vendors · 2 products

References

4 links