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Fencer Vulns
high 7.5

CVE-2020-25630 json

Moodle Denial of Service

published 2020-12-08 5 y ago modified 2026-09-08 2 mo ago also BIT-moodle-2020-25630 , EUVD-2022-2734 , GHSA-66xp-28cq-mrf2

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 71%
public exploits
0
none known

Summary

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.

Patch / fix

  • packagist moodle/moodle 3.5.14, 3.7.8, 3.8.5, 3.9.2
  • bitnami moodle 3.5.14, 3.7.8, 3.8.5, 3.9.2
  • moodle moodle 3.5.14, 3.7.8, 3.8.5, 3.9.2

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-25630 updated cvss 5.3

moodle: decompressed size of zip files leads to denial of service

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.36% chance of exploitation in the next 30 days, higher than 71% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
packagist moodle/moodle
>=3.9, <3.9.2
>=3.8, <3.8.5
>=3.7, <3.7.8
>=3.5, <3.5.14
3.9.2
3.8.5
3.7.8
3.5.14
bitnami moodle
>=3.5.0, <3.5.14
>=3.7.0, <3.7.8
>=3.8.0, <3.8.5
>=3.9.0, <3.9.2
3.5.14
3.7.8
3.8.5
3.9.2

Affected products

  • n/a Moodle

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.