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Fencer Vulns
high 8.8

CVE-2020-13671 kev in the critical feed json

Drupal core Unrestricted Upload of File with Dangerous Type

published 2020-11-18 5 y ago modified 2026-09-19 50 d ago also BIT-drupal-2020-13671 , DRUPAL-CORE-2020-012 , EUVD-2021-2168 , GHSA-68jc-v27h-vhmw

cvss
8.8
version 3.1, CNA
cisa kev
Exploited
added 2022-01-18
epss
36.2%
EPSS 36.2% chance of exploitation in 30 days, percentile 98%
public exploits
0
none known

Summary

Drupal core does not properly sanitize certain filenames on uploaded files, which can lead to files being interpreted as the incorrect extension and served as the wrong MIME type or executed as PHP for certain hosting configurations. This issue affects: Drupal Drupal Core 9.0 versions prior to 9.0.8, 8.9 versions prior to 8.9.9, 8.8 versions prior to 8.8.11, and 7 versions prior to 7.74.

Patch / fix

cisa required action Apply updates per vendor instructions.

  • packagist drupal/core 7.74, 8.8.11, 8.9.9, 9.0.8
  • packagist drupal/drupal 7.74, 8.8.11, 8.9.9, 9.0.8
  • bitnami drupal 7.74.0, 8.8.11, 8.9.9, 9.0.8
  • drupal drupal 7.74, 8.8.11, 8.9.9, 9.0.8
  • drupal7 Ubuntu Pro 14.04 LTS 7.26-1ubuntu0.1+esm2
  • drupal7 Ubuntu Pro 16.04 LTS 7.44-1ubuntu1~16.04.0+esm2

ubuntu advisories UBUNTU-CVE-2020-13671

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • drupal7 Alpine 3.20, Alpine 3.19, Alpine 3.18 +7 more 7.74-r0

alpine advisories ALPINE-CVE-2020-13671

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2020-13671 updated cvss 8.8

drupal: improper filename sanitization can lead to remote code execution

  • 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

Timeline

  1. Published
  2. Added to CISA KEV
  3. CISA patch deadline
  4. CISA SSVC: exploitation active

Known exploited

Added
4 y ago
Patch by
2022-07-18 (4 y ago)
Ransomware
Not known
Required action
Apply updates per vendor instructions.
Vendor, product
Drupal, Drupal core
CISA name
Drupal core Un-restricted Upload of File

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
no
Technical impact
total
Assessed
21 mo ago

Exploit prediction

36.17% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
GitHub 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:H
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.5 AV:N/AC:L/Au:S/C:P/I:P/A:P
OSV 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
packagist drupal/core
>=9.0.0, <9.0.8
>=8.9.0, <8.9.9
>=8.0.0, <8.8.11
>=7.0.0, <7.74
9.0.8
8.9.9
8.8.11
7.74
packagist drupal/drupal
>=7.0.0, <7.74
>=8.0.0, <8.8.11
>=8.9.0, <8.9.9
>=9.0.0, <9.0.8
7.74
8.8.11
8.9.9
9.0.8
bitnami drupal
>=7.0.0, <7.74.0
>=8.8.0, <8.8.11
>=8.9.0, <8.9.9
>=9.0.0, <9.0.8
7.74.0
8.8.11
8.9.9
9.0.8

Affected products

  • Drupal Drupal Core

Classification

Weakness
  • CWE-434 Unrestricted Upload of File with Dangerous Type

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.