Resource exhaustion in Moodle

CVE-2020-25630

A vulnerability was found in Moodle where the decompressed size of zip files was not checked against available user quota before unzipping them, which could lead to a denial of service risk. This affects versions 3.9 to 3.9.1, 3.8 to 3.8.4, 3.7 to 3.7.7, 3.5 to 3.5.13 and earlier unsupported versions. Fixed in 3.9.2, 3.8.5, 3.7.8 and 3.5.14.

Vulnerability class: DoS (Denial of Service)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.014 (70.7th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 70.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2020-25630: held from 0.013 to 0.014.

EPSS over last 30 days · oldest: 0.013 · newest: 0.014 · change: +0.000

Affected products

  • Moodle
  • Moodle — versions 3.9 to 3.9.1, 3.8 to 3.8.4, 3.7 to 3.7.7

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2020-25630?
CVE-2020-25630 is a high-severity vulnerability in Moodle, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2020-12-08.
How severe is CVE-2020-25630?
High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2020-25630 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.